On the pressure relief valves, emergency shut-off valve and open the valve settings (a)

Pressure relief valves, emergency shut-off valve and emergency valve to open the settings Abstract: The pressure relief valves, emergency shut-off valve and emergency valve is open and applications in recent years the development of valves, water supply has been building and fire circles, its settings On the issue of his own views.



Key words: pressure relief valve to open the emergency valve emergency shut down valve hydraulic control valves, fire-specific



1 pressure relief valve



Pressure relief valve installed in the fire service pump outlet pipe, the normal shut down, the fire more than the pressure of water supply network settings automatically when turned on, water supply system in order to prevent damage due to overpressure.



Fire to the water distribution network of over-pressure was mainly due to the following reasons: ① design flow selected by the fire pump flow - lift curve is steep type, in a small flow of run-time (the initial self-test or fire) will appear overpressure; ② pumps due to a sudden it (such as power failure) stop transfer, delivery and did not take appropriate technical measures to stop pump water hammer caused by overpressure.



Pressure relief valve settings should pay attention to the location, caliber choice, pressure and the corresponding annex to configuration settings and so on.



① pressure relief valve may be located in the vicinity of the fire pump or water tank near the fire. Automatic sprinkler system design specifications "GBH84-1985 amendment to Article 10.3.3 of the支审稿requirements:" ... ... each pump control valve outlet pipe should be set up ... ... and, if necessary, pressure relief valve should be located. "Approval of the provision in the draft was changed to: "... ... when necessary, should be taken to control the pump outlet pressure for the measure." These measures which includes the pressure relief valve.



When the pressure relief valve installed in the outlet pipe when the fire pump can be located in a non-return valve before and after. Before a non-return valve located in a small flow of water running digestion caused by excess pressure, and after in a non-return valve (along the direction of flow) due to not only remove a small flow of water caused by running the overpressure, but also remove from the p

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How to solve the valves in the course of Frequently Asked Questions

1, why is a small two-seater valve opening hours of work likely oscillation?

     Pairs of single-core, when the medium is open-type flow, the valve stability; when the medium is a closed-type flow, the valve of the stability of the difference. There are two spool valve seat, the next spool in the flow of closed, open on the spool in the flow, so that a small opening in the work, the flow of closed-type valve spool is easy to cause vibration, which is two-seat valve can not be used for the work of a small opening reason.

2, why double-sealing valve as a shut-off valves can not be used?

     Two-seat valve spool force balance the advantages of the structure, allowing large differential pressure, and its obvious drawback is that two sealing surface can not be good contacts at the same time, resulting in large leakage. If it is artificially Mandatory used to cut off occasion, apparently ineffective, even if it made a lot of improvements (such as the double-sealed sleeve valve), is also undesirable.

3, what straight poor performance, aiming to halt the stroke control valve, angle valve, prevent the travel of good performance?

     Direct travel is vertical throttle valve spool, while the medium is the level of flow into the outflow valve cavity flow channel bound to turn down Shui Po, so that the valve flow path becomes quite complex (shape such as the inverted "S" type). In this way, there are many dead zone, the precipitation of the medium provides a space for the long run, causing blockage. The direction of travel throttle valve angle is the horizontal direction, the level of flows into the medium, the level of outflow, easy to clean media is not removed, flow path at the same time simple and very little room for medium precipitation, therefore, prevent the valve angle stroke of good performance.

4, why do straight stroke adjustment valve stem smaller?

     It involves a simple mechanical principle: sliding friction, rolling friction small. Trip valve stem straight up and down movement, packing slightly pressed a little, it will stem bag tightly, resulting in a larger backlash. To this end, valve stem is designed to be very small, they often fill a small friction coefficient of PTFE packing, in order to reduce hysteresis, but the resulting problem is that stem thin sent, then the easy to bend, filling a shorter life expectancy. To solve this problem, the best way is to turn valve stem with the brigade, namely, the class trip valve angle, and its stem stroke than the straight stem crude 2 ~ 3 times, and the selection of long-lived graphite packing, valve stem stiffness Well, filling long life, but its friction torque is small, a small hysteresis.

5, why cut off the angle valve pressure class travel more? 

 6, why the use of desalination water medium rubber lined butterfly valve, lined diaphragm valves and short service life?

     Desalination of water medium containing low concentration of acid or alkali, they have a greater corrosive to rubber. Rubber showed expansion of corrosion, aging, low intensity, with the rubber lining of the butterfly valve, diaphragm use the results are poor, its essence is caused by corrosion of rubber impatience. After the rubber lining for Diaphragm Valves to improve corrosion resistance of a good Lining diaphragm valves, diaphragm valves of the diaphragm, but lined up and down then stand up to collapse were broken off, resulting in mechanical damage to valves shorter life expectancy. Now the best way to deal with specific water valve, it can use to 5 ~ 8 years.

7, why use a hard shut-off valve should be closed?

     Shut-off valve required leakage as low as possible, soft-sealing valve leakage is the lowest cut off the effect is good, but not wear and poor reliability. From the leakage volume is small, sealed and reliable double standards, not as hard on the soft sealing off sealing off well. As a full-featured ultra-light control valve, sealing the heap are wear-resistant alloy protection, high reliability, leakage rate of 10-7, has been able to meet the shut-off valve requirements.

8, why sleeve valves instead of a single, two-seat valve does not wish fulfilled?

     60 years came sleeve valve, 70 years large-scale use at home and abroad, and 80 years the introduction of the sleeve valve petrochemical plant accounted for a larger proportion of that time, many people think that the sleeve valve can replace a single, two-seat valve , to become the second-generation product. By now, is not the case, single-seat valves, seat valves, sleeve valves have been the same use. So, the only shared use.

9, Why is selection is more important than the calculation?

     Calculation and selection of comparison, the selection should be much more important, much more complex. Because the calculation is a simple formula, which itself does not lie in the accuracy of the formula, but rather by the given parameters are correct. Selection related to the contents of the large, slightly careless, would lead to selection of properly, not only causes human, material and financial resources to waste, and use the result was unsatisfactory, and has brought a number of user issues, such as reliability, life, running quality.

10, why in the pneumatic valve in the piston executing agencies will be more and more?

     For the pneumatic valve, the piston executing agencies may make full use of gas supply pressure, the executing agency of the size smaller than the membrane, a greater thrust piston in the O-ring and reliable than the film, so its use will Yuelai more. 

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Valve Selection

Butterfly valve butterfly plate installed in the direction of the pipe diameter. Cylindrical channel in the valve body, the disc-shaped butterfly plate around the axis of rotation, rotation angle of 0 ° -90 ° between the rotation to 90 ° when the valve is fully open state license.



Butterfly simple structure, small size, light weight, only by a small number of parts. And just rotate 90 ° to quickly open and close, easy to operate, while the flow control valve has a good feature. Butterfly in the fully open position, the butterfly plate thickness is only when the medium flows through the valve body resistance through the valve so the pressure drop generated by small, it has good flow control characteristics. There are shells and metal sealing butterfly valve seal two kinds of sealed type. Elastic sealing valves, seals can be mounted on the body or attached to the butterfly board peripheral.



Metal sealed valves generally higher than those elastic sealing valve long life, but it is difficult to achieve completely sealed. Metal seal can adapt to a higher operating temperature, flexible seal is affected by temperature limit has flaws.



If you require the use of flow control valve as the main choice is the right size and type of valve. Butterfly structure principle is particularly suitable for production of large-diameter valves. Butterfly not only in oil, gas, chemicals, water treatment, etc. are widely used in general industry, but also applied to thermal power plant cooling water systems.



Commonly used in butterfly valves are wafer type butterfly valve and flange type butterfly valve two kinds. Right clip-on butterfly is double-headed bolts to connect the valve between the two pipe flanges, flange type butterfly valve is a valve with a flange on, with bolts at both ends of the valve on the pipe flange connection method Lan on.



Butterfly valve structure and the problems in the course of



At present, the butterfly valve is used to achieve piping system as an on-off and flow control components, has been in the petroleum, chemical industry, metallurgy,%2

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Process control valve should be how to choose (c)

5, the choice of caliber valve



The choice of valve diameter and the main basis for determining the flow capacity of valve that is Cv. In a variety of engineering design and selection of instruments, the valve must be calculated Cv and provide manual control valve design. Cv from the regulating valve to the valve diameter calculated to determine the general subject to the following steps:



1) determine the flow calculation. The existing production capacity, equipment and medium load conditions, decided to calculate flow Qmax and Qmin.



2) the determination of differential pressure valve before and after. Valve has been chosen in accordance with the flow characteristics and system characteristics of the selected S (drag coefficient), and then calculating the pressure difference to determine.



3) calculation of Cv. According to the regulation of the media choose the right formula and charts to obtain Cmax and Cmin.



4) choice of Cv. According to Cmax, in the standard series of products to choose select> Cmax level and its nearest C.



5) check valve opening. General requirements for calculation of the flow at the time of the largest opening ≯ 90%, the smallest at the time of calculation of the flow opening ≮ 10%.



6) regulating valve of the check than the actual adjustable. Generally require more than the actual adjustable ≮ 10.



7) valve seat diameter and the determination of nominal diameter. The right to verify, in accordance with C determined.



6 Conclusion



The choice of valve is very meticulous work, we not only need a solid theoretical knowledge of the profession, but also have rich practical experience. Choice is not only conducive to good-conditioning control loop tuning of PID parameters so that the parameters were adjusted to get a better control effect, but also the life of valve increase greatly. Select regulating valve in line with local conditions, not static, it is necessary to the process in practice and innovation, constantly sum up, in particular with the mechanical-electrical integration technologies, computers and digital information technology, the structure and function regulating valve to get better, more comprehensive, for the selection of control valve provides a great convenience. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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Rotary Valve in Petrochemical Plant (b)

2 types of rotary valve 2.1 classification in accordance with the type of rotary valve in accordance with the type of categorization of three types: butterfly valve, ball valve and valve plunger. Butterfly baffle or blade through the shaft as the center to rotate a certain angle to control the direction of flow. Baffle or blade looks a bit like a butterfly. Butterfly valves can be cut or regulation applicable to a solid paste or fluid suspensions. Ball valve with the valve core is the hole shape of the ball, when the valve is in open position to allow fluid flow when the ball off a 90-degree rotation physical logistics. Ball valve can be cut off from the role and regulation, and its small pressure drop for viscous and corrosive fluids, low temperature fluid slurry. Ball valve can also be used in high temperature, high pressure fluid. The spool valve plunger in the middle with tapered or cylindrical hole of the plunger, when the plunger hole and when the fluid flow direction can be, when the plunger to rotate 90 degrees in any direction when the flow was cut off the road. Plunger valve is usually used for on / off control. 2.2 classification in accordance with the rotary valve operation mode of operation in accordance with the classification of the following types: manual valves, automatic valves and control valve. Rotary Valve manually operated by hand, by manually executing agencies, such as hand-rod, gear, hand wheel and so on to carry out a switching operation, including a 90-degree rotation of the parts. Implementing agencies through the operation of the valve and flow control components to open valves and valve clearance. Automatic rotary valve, including the implementation of an automatic to make use of external energy to automatic control or remote control switch valve. Should use the following general automatic valve: The valve (eg, greater than 8 "valves), manual operation of the valve is very difficult, in a toxic or other adverse environment can not be manually operated valves, for to deal with emergency situations must be rapidly closed valve valve; bulk formula with all the valves and other flow path. self-executing agencies, including the type of hydraulic, pneumatic and electrical and so on, the majority of automatic rotary valve can be the executing agency for electrical and pneumatic to operate. rotary valve to the opening in a particular operation, this type of valve, including the size of an electrical signal generated in accordance with the corresponding corner of the implementing agencies. butterfly valves are commonly used in low-voltage large-diameter, and leakage control requirements less stringent in . rotary control valve is a control valve, control valve also includes a number of straight travel valve, such as cut-off valve, gate valve, valve. automatic shut-off valve is not controlled rotary valve, because it can only be limited to the OFF position.









3 Application of the trend of rotary valve (1) the automatic valve in place of manual valves for industrial applications has become a trend









With the worldwide industrial automation and process improvement and adjustment of automatic rotary valve increasing demand, while reduced demand for manual valves. Valve so that the future application of this technology development should focus on the point of the valve actuator and the locator so that the valve can be connected to the personal computer, PLC, DCS system. Such as by increasing the number of locator control valve to increase the accuracy of the control valve performance, the success of the application if the digital locator ND800 for rotary control valves, process parameters will be able to make the scope of the variable increased by 50%, and then with control valves, valve positioner of the characteristics of the electronic properties of the match to further enhance the control performance. Typical applications are the use of HART Network Field Browser software.









Compared with the shut-off valves, control valves, is more applicable to a continuous production process. By regulating the function, control valve to the input parameters to change according to the size of the flow in order to maintain the same settings. In many cases, cut off both valves and control valves are required, such as oil refineries, the 1 / 4 rotation to be used as safety shut-off valve shut-off valve. A control valve and the two shut-off valves are usually used together, when the demolition of control valves to isolate and cut off when the play the role of logistics.









Electric implementing agencies will gradually replace the pneumatic executing agencies, as implementing agencies do not require electrical installation and maintenance for the pipeline and compressor, and the locator can be more closely linked, and can be avoided will be converted to gas signal signal.









Rotary Valve is the other direction of development by improving the design of the valve seat and valve seat material to improve valve performance, reduce leakage, such as the outer valve. The role of control and positioning of the smart valves, as manufacturers reduce costs and increase productivity enterprises demand the market is becoming increasingly widespread. (2) to replace the trend of straight trip valve









Rotary valves because in many cases can replace the straight trip valve (eg valve), with straight trip valve (eg valve), the rotary valve has many advantages (see Part 1 of this article). Especially with the action to clean up the air (CAA) the implementation of the amendment to prevent external leakage of valve is becoming increasingly important. 1990 amendments to the CAA, including the 189 kinds of volatile toxic air pollution sources (VHAPs), which is 150 kinds of volatile organic compounds (VOCs). April 1997 through the latest amendments to the CAA, in addition to including the former version of the amendment of the leak detection and repair (LDAR) program, also includes quality improvement program. 







  

  

 

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A brief introduction of multi-functional water pump control valve technical requirements (b)

4. Stem, relief valve closed, the main valve plate



Closed relief valve should be connected with the stem fastening and reliable.



Relief valve closing the main valve plate and seal plate type should be the type of metal seal.



The main valve stem must be sliding plate and a flexible and reliable.



The main valve plate and the main valve seat sealing plate can be sealed metal seals and two non-metallic type.



5. Diaphragm



The appearance of patch quality should be consistent with the provisions of HG/T3090.



When used in drinking water, the membrane material should be consistent with the security provisions of GB/T17219.



6. Control system



Control system components of the valve should be able to withstand the maximum working pressure, the site may not be leaked.



7. Material



The main components of the selected material should be in accordance with the provisions of JB/T5300.



Copper alloy castings shall be in accordance with the provisions of GB/T12225; gray iron castings shall be in accordance with the provisions of GB/T12226, the tensile strength should be not less than 200MPa; ductile iron castings shall be in accordance with the provisions of GB/T12227; carbon steel castings should be in line with GB / T12229 requirements; austenitic steel castings shall be in accordance with the provisions of GB/T12230.



Multifunctional Pump Control Valve Steel Casting appearance quality should be consistent with the provisions of JB/T7927, multi-pump control valves, iron casting the light of the appearance of the quality of the provisions of JB/T7927.



8. Shell strength



Multifunctional Pump Control Valve shell strength should be consistent with the provisions of GB/T13927.



9. Sealing performance



Multifunctional Pump Control Valve should be in accordance with the sealing performance GB/T13927 requirements.



10. Cleanliness



Multifunctional Pump Control Valve should be in line with the cleanliness JB/T7748 requirements.



11. Painting



When used in drinking water, the multi-functional water pump control valve cavity coating materials should be consistent with the security provisions of GB/T17219. The outer surface of coating is not provided, the special requirements of the contract specified in the order.

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Alarm valve in the construction of the three major application of analytical

 Alarm valve is connected to automatic sprinkler system, or cut off water, and start the alarm device. In the automatic sprinkler system, alarm valve is a critical component, and its role to three factors: connect or disconnect the water supply, the output alarm signal and the prevention of water pumped back into the water supply source, and through the alarm valve can be installed on the system's water supply and alarm devices tested. Alarm valve according to the system were divided into wet alarm valves, dry-type alarm valve and the deluge valve.

     1. Wet alarm valve for wet sprinkler systems. Its main function is: When the nozzle is turned on, wet valve automatically opens, and make water flows into the hydraulic alarm bell triggering an alarm.

     2. Dry-type alarm valve for dry-type sprinkler system. It will be the valve flap valve into two parts, the export side with the system piping and the nozzle connected to the compressed air inside the filling, import side and water connected. Dry-type valves use air pressure and water pressure acting on both sides of the flap valve torque difference control valve on the valve closed and open, generally can be divided into differential-type dry-type alarm valve and sealed dry-type alarm valve two kinds of.

     3. Deluge valve for the rain sprinkler systems, pre-action sprinkler systems, water systems and water spray curtain destroy the system. The import side of this valve and water connected to the export side connected with the system piping and nozzles, usually air traffic control, only the role of the system in the pre-inflated. Deluge valve opening control by a variety of fire detection devices. 

  

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Ceramic ball valve in the chlorine soda ash industry the practical application of

Soda industry is an important chemical raw material industry, soda ash is the protection of national economic development, the basic industrial raw materials. China's soda ash in the international market has a strong competitive edge. Countries in the "Tenth Five-Year" or even a long period of time, organic materials, composite materials, new technologies, fine chemicals and the traditional "two bases" and as a chemical "Tenth Five-Year Plan" and the next 15 years the focus of planning.



At present, China's soda ash is used mainly ammonia soda process and the production of alkali. Ammonia is alkaline salt and limestone as the main raw materials, ammonia in the middle of the supporting material for the production of soda ash method. Refining processes in brine,细盐water Mg2 +, Ca2 + reaction Mg (OH) 2 and CaCO3, the formation of salt, cement, salt, cement mixed with the distilled liquid waste by the filter press for clarification or clear liquid (L1) emissions, solid slag (S1) storage. Salt water (or water) as a coarse salt dissolved after water purification to remove Ca2 + and Mg2 + impurities, refined salt in the ammonia absorption tower to absorb ammonia to generate ammonium salt, ammonia salt absorption of carbon dioxide in the carbonation tower, NaHCO3 generate suspension, suspension by the vacuum filter cake obtained after calcination products for soda ash, calcined return carbon dioxide generated by the use of carbonation tower; filtering the mother liquor by adding milk of lime has been sent to distillation tower ammonia ammonia recovery, recovery ammonia ammonia absorption tower for the preparation of ammonium salt. Joint alkali plant based on ammonia production from ammonia and carbon dioxide and crude salt as raw materials to produce soda ash and ammonium chloride co-production method. In the process of making soda ash, ammonia and carbon dioxide in the mother liquor Ⅱ carbonation carbonation tower, the generated suspension NaHCO3, vacuum filtration of the mother liquor after the process of sending Ⅱ,



Cake for the soda ash after calcination products; Preparation of ammonium chloride in the process, from the mother liquor vacuum filter ammonia by absorption, heat exchanger, the mold in the cold analysis of crystal precipitate ammonium chloride slurry, after the cold out salting-out mother liquor in the crystallizer to precipitate ammonium chloride in the salt crystal slurry, the mother liquor after salting-out via heat exchangers, absorption of ammonia, to clarify the post-production of ammonia was qualified mother liquor Ⅱ, Ⅰ sent to the process. Analysis of cold precipitation and salting-out process of the crystal slurry, by, centrifuge, dry products to be ammonium chloride.



Both the production process, soda ash and ammonium chloride in the production process, there is a long process, the system mother liquor at high temperature and composition of complex with ammonia and ammonium root, and contains a certain amount of calcium, magnesium solids, particularly in the emissions of green waste processing, pipelines and other equipment corrosion, wear and tear very serious, equipment failure, etc., have frequent maintenance. Equipment, thereby increasing corrosion resistance, wear-resistant performance of safe and stable operation of the equipment is extremely important. In particular, as fluid control components bear the brunt of the valve. 

  

  

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Pressure valve failure causes and test methods

Agricultural machinery, hydraulic system, the pressure valve is used more often in a class of components, the pressure valve a sudden failure will directly affect the normal operation of machinery and equipment, this paper points the pressure valve failure reasons and examples of the pressure valve testing methods.



1. The common cause of failure



(1) hydraulic valve core and valve body when using the continuous generation of wear and tear, allowing part size, shape and surface quality changes.



(2) the balance of hydraulic valve springs, valve core and valve seat, in the long run to work under variable loads, resulting in fatigue and crack, resulting in spring, break, or the valve seat sealing surface, peeling off, damaged.



(3) hydraulic valve parts processing residues and use of residual stress in the external load stress, the material yield strength of more than spare parts, spare parts deformation.



(4) hydraulic oil mixed with water or too much acid, using a longer time, the corrosion of hydraulic valve parts to lose their accuracy.



(5) with the valve spool suites liquid radial force imbalance, ultimately spool valve comprising a wall pressure to the clamping phenomenon occurs.



(6) in the hydraulic valve manufacture or repair, did not meet the technical requirements provided; or part lack of good care, rust, mixed with dirt and so on.



2. For example, test methods



Pressure valves including relief valves, pressure reducing valve and sequence valve, this paper valve pressure relief valve as an example shows the test items and testing methods. Pressure valve test can be conducted in a dedicated test rig can also be carried out in an integrated test bed.



(1) the scope and the pressure regulator stability test. Regulating valves were tested hand wheel adjustment, from fully open to fully closed, and then to fully open from the pressure gauge shows the pressure rise and fall as well as voltage range. Pressure gauge pointer should be a smooth rise and fall voltage range should meet the required voltage range at the highest pressure, pressure fluctuation is not to exceed the specified value.



(2) within the leakage test. Regulating valve adjustment by hand wheel to full closed position, adjustable overflow valve as being the maximum pressure test valve, and then try regulating valve hand wheel adjustment, so that subjects were measured within the overflow valve leakage.



(3) The unloading stress testing. The relief valve remote control port access fuel tank, so that valves were tested by examining the flow, measuring the pressure relief valve in and out of the oil port, the difference shall be unloading valve pressure test.



(4) pressure loss testing. Regulating valve adjustment were tested hand wheel to full release and make valves were tested by examining the flow, measured by the pressure gauge the pressure relief valve in and out of the oil port, the difference shall be test valve pressure loss.



(5) open and close feature tests. Close overflow safety valve, regulating valve were tested to the maximum pressure, regulate blood pressure overflow valve make the system gradually, when the valve is closed down by the pressure test subjects were measured at excess flow valves. Adjustable overflow safety valve, pilot valve has been no overflow from the beginning to make the system a gradual step-up, when the pilot valve has been opened up to stress, measured by the excess flow valve. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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Wear-resistant ceramic ball valve's performance characteristics and application of the promotion of

China valves commonly used in industry for metal valves, metal valve has been the use of the history of a century, although the metal valve through the improvement of structure and materials, subject to the restrictions on the properties of metallic materials, can not meet the increasingly high wear and tear, corrosion, such as strong demand for the poor working conditions, mainly reflected in the life of a short, serious leaks have greatly affected the stability of system operation. In urgent need of the traditional metal valves from the materials, design and manufacturing process innovation and so thorough.



Ceramic materials to be used in the industrial valve is a bold and useful innovation. Deformation of ceramic materials is very small, much higher than the metal with a combination of strength, generally composed of ceramic materials under the crystal ionic radius of the small and high-ion price, with the median, and these determine the nature of the tensile strength of ceramic materials strength, compressive strength, elastic modulus, hardness, etc. is very high. Ceramic itself, however the "brittle" and difficult-to-machine limited its scope of application, over the past decade over the past few years, as a result of martensitic transformation toughening technology, composite materials technology and nano-ceramic Section the concept of development and progress, has made ceramics " brittleness "have been greatly improved, and its toughness and strength has been greatly improved, expanding the scope of application.



In recent years, new types of ceramic materials in petroleum, chemical, and mechanical applications, such as very active using the wear resistance of ceramics, the production of wear-resistant Corrosion resistant parts of the Department in lieu of metal materials, high-tech materials in recent years the importance of market One direction of development.



Product performance characteristics:



★ all contacts with the media are part of the structure of ceramic materials, their chemical stability and high hardness (Rockwell hardness HRC90), second only to diamond. Therefore, this ball valve has a very high wear resistance, corrosion resistance, erosion-resistant performance, and good heat insulation, small thermal expansion.



★ ball grinding equipment and the use of advanced manufacturing technology, high accuracy ball roundness, surface quality, and the seat of the inquiry, the use of self-Zr02 ceramic lubricants, and can obtain good sealing performance.



★ completely changed the hard metal sealing ball valve easily leak, torque, and sealing surface corrosion of the shortcomings of intolerance.



★ good wear resistance of ceramic, so that the valve is durable, extremely high reliability. Life long monel titanium valves and valve 2-4 times.



★ for high hardness of the granular media, or the soft particles and corrosion medium, the valve is absolutely unmatched advantages, is the only appropriate medium for such valves.



Social and economic benefits of ceramic valves:



1. Ceramic valve structure using high-tech ceramic materials new valve sealing components and vulnerable parts of the valve products to improve resistance to abrasion, corrosion and sealing, greatly extended the life of the valve.



2. The use of ceramic valves can significantly reduce the number of valve replacement maintenance, equipment operation to improve security and stability, saving the cost of repairing equipment.



3. The use of ceramic valves can improve the sealing of industrial piping systems, to reduce the maximum leakage, thereby protecting the environment.



4. To create a wide range of ceramic raw materials, low-cost, aluminum, carbon, silicon and other non-Su-general will be able to create superior performance ceramic materials, can save a large number of rare metal materials and mineral resources.



Wear-resistant ceramic valves are mainly used in electric power, petroleum, chemical, metallurgy, mining, sewage treatment and other industrial fields, especially in the face of high wear and tear, strong corrosion, high temperature, high pressure, such as poor working conditions, ceramic valve showed its excellent performance. Ceramic valves to meet the high wear and tear, the use of strong corrosive environment, in particular, is a prominent feature of the ultra-long life, ceramic valves are far superior to other similar cost-effective metal valve. With the continuous development of science and technology and progress of, ceramic materials from the formulation, molding, machining and assembly process technology and other more mature and complete, ceramic valves for its excellent performance has been a growing recognition of the valve industry . Manufacture of ceramics using the successful experience of the valve can also be used to promote a wider range of engineering fields.



Dedicated polysilicon solar valve (for: gas transmission silica fume)



In the delivery of silica fume, the silica coated ball easily, resulting in the emergence of such issues as disclosure, silica fume due to the reasons for the high hardness, the average life of a very short ball valve.



Merrill Lynch & Co., Kim Tae-view of this situation, the application of specialized research and development of the dedicated transmission silica ceramic valves, the use of structural ceramics with strong corrosion resistance, as well as the high zirconium alloys resistant materials, so that the new life of the valve is higher than the original valve 6 times the door to the polycrystalline silicon solar energy transmission device management silica fume has brought an exciting good news!



Performance characteristics:



★ all contacts with the media are part of the structure of ceramic materials, their chemical stability and high hardness (Rockwell hardness HRC90), second only to diamond. Therefore, this valve has a very high wear resistance, corrosion resistance, erosion-resistant performance, and good heat insulation, small thermal expansion.



★ ball grinding equipment and the use of advanced manufacturing technology, high accuracy ball roundness, surface quality, and the seat of the inquiry, the use of self-Zr02 ceramic lubricants, and can obtain good sealing performance.



★ completely changed the hard metal sealing ball valve easily leak, torque, and sealing surface corrosion of the shortcomings of intolerance.



★ good wear resistance of ceramic, so that the valve is durable, extremely high reliability. Life long monel titanium valves and valve 2-4 times.



★ for high hardness of the granular media, or the soft particles and corrosion medium, the valve is absolutely unmatched advantages, is the only appropriate medium for such valves. 

ball valve

  

 

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Power Plant Control Valve Selection and Application of the security considerations

Simply look at the power flow is actually water, steam cycle process, in this selection process control valves both simple and complex. Media is simple and easy process, only the water and steam are two kinds of complex water and steam temperature and pressure fluctuations over large areas, has brought a series of issues such as: flash, cavitation, erosion, noise, corrosion. But the first thing to consider is the control valve of the safety and reliability.



To the valve (main, with a boiler valve, compound feed water control valve)



Control requirements: Control of the boiler into the water to ensure steam evaporation, and the maintenance of the boiler water level (main, with a boiler to the valve system consists of two control valves, one for the boiler starts to use, one for normal water use).



Condition: The boiler starts up to 100-300 kg of pressure valves, flow smaller, less pressure during normal operation, traffic flow, flow rate adjustable ratio 75/1-100/1.



Valve requirements: WCB/WC9, for the pairs of valves in the system requirements to start anti-cavitation valve, V-class off class for the compound to the water valve need to use features of Valve parts while meeting the boiler startup and normal operation needs. Generally choose to fail off valve.



Boiler feed pump minimum flow valve cycle



Control requirements: the safety of boiler feed pump to start and stop running, to eliminate traffic is too small, temperature increase, the water a strong cavitation damage to the pump. (Old-fashioned power stations are used to switch-based minimum flow control valves, along with the use of mechanical pumps automatically cycle valves).



Condition: The pressure drop of up to 160-350 kilograms, is the largest power plant systems to withstand pressure valves, flow for a regular flow of 30%.



Valve requirements: anti-cavitation and plug up the structure, V-class seal level, pump start and stop running when the valve continuous work, pump normally starts the valve closed, the valve usually fail to open.



Low heater trap (hydrophobic water heaters, condensing water heater hydrophobic)



Control requirements: Control of condensation water heater location, promptly condensate water discharge, high water discharge, the normal water level of hydrophobic



Condition: The saturated water heater control valve between the pressure is usually 6-30 kg, finally a trap directly connected to the condenser or deaerator.



Valve requirements: anti-flash erosion, V, or VI level seal rating, the valve usually fail to open.



Deaerator Water Level Control Valve (DALC)



Control requirements: to provide flow deaerator to maintain a normal water level, by adding steam to increase temperature to eliminate the gas dissolved in the water.



Condition: The flow of small start-up phase, pressure of high temperature, the normal flow of large pressure difference is small, similar to the valve condition.



Valve requirements: low-flow and effective anti-cavitation.



Temperature reduction valve (desuperheater)



Control requirements: the high-pressure water jet of steam into the steam temperature manipulation to control requirements, working conditions: The water pressure higher.



Valve requirements: type of diversity: nozzle type, assisted atomization type, self-contained type and right-clip.



Reduced temperature valves (high and low pressure bypass valve)



Control requirements: the high-temperature high-pressure steam to adjust to a certain temperature and pressure of steam to the steam turbine to provide a bypass channel, boilers, steam turbine capable of independent working.



Condition: The high temperature and pressure steam.



Valve requirements: resistance to thermal shock, noise reduction, quick response. 

  

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Ceramic ball valve in the soda ash industry-specific applications

 Soda ash industry is an important chemical raw material industry, soda ash product is to protect national economic development, basic industrial raw materials. China's soda ash soda ash products in the international market, has a strong competitive edge. Countries in the "15" and even over the longer term, organic raw materials, synthetic materials, new technology, fine chemicals and the traditional "two bases" and as a chemical "Tenth Five-Year Plan" and the next 15 years, the focus of the planning.

     At present, China's soda ash ammonia soda business is mainly used for production of alkali and the United Nations. Solvay is a salt and limestone as the main raw materials, auxiliary materials, intermediate ammonia method of production of soda ash. In the brine refining process, crude salt water, Mg2 +, Ca2 + the reaction of Mg (OH) 2 and CaCO3, the formation of salt, cement, salt, cement and distilled liquid waste mixed waste by the clear liquid to clarify or filter press (L1) emissions, solid slag (S1) stockpiling. Salt water (or sea) salt dissolved into crude, after refining crude salt in the water to remove Ca2 + and Mg2 + impurities, refined salt water after the ammonia in the absorption tower to absorb ammonia ammonia salt, ammonia salt water in the carbonation tower to absorb carbon dioxide, Build NaHCO3 suspension, suspension, through the vacuum filter cake obtained after calcining for soda products, carbon dioxide generated by calcination to return carbonation tower use; filtering the mother liquor by adding lime to be sent to the recovery of ammonia Ammonia distillation towers, recycling Tower of ammonia for the preparation of ammonium salt of ammonia absorption. Hou's process is based on the production of ammonia from the ammonia plant and carbon dioxide and salt as raw materials to produce soda ash and ammonium chloride co-production methods. Preparation of soda ash in the process, ammonia liquor Ⅱ and carbon dioxide in the carbonation carbonation tower, the generation NaHCO3 suspension, vacuum filtered mother liquor sent Ⅱ process, after the cake calcined soda products; Preparation of ammonium chloride in the process, the mother liquor from the vacuum filter through the absorption of ammonia, heat exchanger, the mold in the cold analysis of crystal precipitate ammonium chloride slurry, cold analysis after the mother liquor in the salting-in salt crystallizer to precipitate ammonium chloride crystal slurry , salting and then through the heat exchanger after the mother liquor, smoking and ammonia, were qualified to clarify the post-production of ammonia liquor Ⅱ, Ⅰ sent to the process. Crystallization and precipitation of crystalline salting process pulp, through the thick, centrifugal separation and drying to be ammonium chloride products.

     Both the production process, soda ash and ammonium chloride in the production process, there is a long process, the system liquor at high temperature, but also in the complex composition, not only ammonia and high-chlorine root, and contains a certain amount of calcium, magnesium solids, especially in the environmental emissions of waste processing, equipment, pipelines and other corrosion, wear extremely serious, equipment failures, maintenance frequent occurrence. Therefore, to improve equipment corrosion resistance, wear safety equipment and stable operation of great importance. In particular, as fluid control components, valves are particularly affected.

     Present, China's various industries commonly used in the production of valves for the metal valves, metal valves been in use for a hundred years of history, during which although after the structural and material improvements, but subject to the conditions of metallic materials, self-limited, Yue Lai Vietnam can not adapt to high wear and tear, strong corrosion and other bad working conditions. Life is short, a serious leak. Greatly affected the stability of the system is running. Traditional metal valves is urgently needed materials, design and manufacturing processes, etc. overhaul.

     Engineering ceramics materials as the twenty-first century, new materials, with its itself possess high hardness, high strength, high wear resistance and good anti-corrosion performance, since World War II, they were popular in the developed world, they the race to deploy manpower and material resources, research and development of engineering ceramics, the earliest in the military and aerospace industries, such as rocket nozzle end of the shuttle heat shield, armored vehicles and so on, then gradually applied to industrial fields, such as ceramic engines, ceramic bearings, etc. Until the early nineties the twentieth century, with the ceramic material itself enhance the performance began to be used in the valve industry, and has been widely recognized.

     Engineering Ceramics also known as structural ceramics, and ceramics are essentially different from ordinary. Valve used on ceramic materials is mainly TZP, it is the raw material is a zirconium gem materials, spray granulation, and so quiet repression, high-temperature sintering, precision machining, making ceramics, "brittle," has been greatly improved, its toughness and strength has been greatly improved, industry called "ceramic steel." TZP ceramics not only has high toughness, high strength, high hardness, high wear resistance and high corrosion resistance, but also self-lubricating, good thermal conductivity is low, an excellent surface finish (Ra up to 0.01um) and other characteristics It is an excellent replacement of the valve metal material.

     Ball since its inception, with its well-sealed-off, aiming to halt the performance, as well as the flow path simple, seamless adjustment, KV value of the most, "self-cleaning" the best performance, opening and closing simple and fast, and strong ability to overcome the pressure difference characteristics, in the petrochemical, mining metallurgical, power energy, pharmaceutical and paper industries the rapid expansion of the range of applications. The ceramic ball valve and ball valve combination of structural ceramics dual advantages of a good solution to the soda ash production process in the presence of high corrosion, wear two major problems with high solid content, especially in salt water and distillation processes, ceramic ball hit the core collapse of the current of any corrosion-resistant materials, wear-resistant alloy spool, so far the best ceramic ball valve into the valve.

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Sequence Valves Hydraulic Control Valve

1 How it works: according to the working principle and structure, sequence valve direct-acting type and pilot sub-type categories; according to pressure control mode, sequence valve with internal control and external control of the points. In the sequence valve is equipped with a one-way valves, flow through the reverse order of the composite valve called the one-way valve. In general, such valves are used frequently.

2 Function and application: the order of basic function is to control valve actuators of the order of several actions, according to their different functions, are called sequential valve, back pressure valves, unloading valves and balancing valve. Sequence valve is basically the same performance and relief valve, but because of the different functions of the order of valves have their special requirements:

(1) In order to enable the implementation of components to achieve an accurate sequence of actions requiring the order of the regulator valve, high precision, bias is small;

(2) To the accuracy of the order of moves to require valve closed in a small amount of leakage;

(3) for one-way valves in order to require the reverse pressure loss and pressure loss in the value should be less positive.

     The main functions of the order of valve:

(1) control over the order of movement components;

(2) for packing circuit;

(3) to prevent fuel tank caused due to dead weight piston free-fall done Valves use;

(4) with external control valve in order to do unloading valve, the pump unloading;

(5) with the internal control sequence valve for back pressure valve.

Sequence valve manufacturers produce three products: domestic mainly Yuci hydraulic Group Co., Ltd., Beijing, China and Germany Hydraulic Group Co., Ltd., Shanghai Lixin Hydraulic Component Factory and so on. Outside the United States Vickers, Germany, Rexroth and other manufacturers.

4 Sequence Valve Selection: sequential valve assembly structure according to the different, you can implement different circuit functions, such as relief valves, sequence valves and balancing valve function.

     If the valves open and close characteristics of the order of poor, then the flow of a larger pressure is too high, loop and reducing efficiency. Open and close with a hysteresis feature, open the pressure below the closing pressure, the load flow rate changes should be noted. The valve opening pressure is too low, then the pressure below the set pressure before the leak occurred, causing the actuator malfunction. The flow through the valve is far less than the rated flow, vibration, or other instability. At this point the road to return to action. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Parallel Shuangzha plate cracking valve

A technological advance



The valve compact structure, smooth operation, good sealing performance and long service life, configuration, intelligent actuators can realize automation.



Two structural features and technical difficulties



Structural features:



A compression part for the extra-thick steel plate welded structure. Two parallel Shuangzha sheet metal seal structure, sealing the surface of carbide surfacing. The valve is turned on, Sealing without friction. Three groups with disc spring wedge storage bodies and institutions, to ensure flexible and reliable valve movement. 4 Configuration intelligent actuators to realize automation.



Technical Difficulties:



A valve and other major structural parts are welded together with extra-thick steel plate, first and foremost problem is to solve weld penetration, while the structural parts without deformation process technology. 2 To improve the sealing surface hardness and wear resistance, in the seat and the gate sealing surface is required to solve large-scale carbide surfacing problems. Three refinements of the valve seat and valve body after welding, the weld away from the sealing surface due to close, a slight deformation after welding, a direct impact on the valve sealing performance. 4 guide plate for a large cast iron thin slab casting difficult. 6 built-in disc spring in the valve group of storage bodies, the valve closed, the disc spring compression storage group, the energy savings, so that when the valve opens an efficient and reliable. Disc spring group 415 ~ 593 ℃ under high-temperature long-term work, the choice of material is essential.



3 Product Scope



Parallel Shuangzha plate cracking valves, suitable for containing the 415 ~ 593 ℃ pyrolysis of coke gas and long-term use. 

  

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Analysis of heavy hammer-type butterfly valve principle and application of the technology areas

1, Technology



By the heavy hammer-type butterfly valve butterfly valve body, linkage hydraulic bypass valve, a heavy hammer, the release device, manual pump (or electric pump), fuel tank rack transmission and electronic control components. Pressure from the oil pump drive tanks enter the rack, the rack by the Pistons to promote butterfly板自spin axis of the gear to open the butterfly plate, and coaxial至下面cite the heavy hammer. Weights through the release of the pawl of the locking device lock spindles Spindle; lock spindle axis is fixed, care and support by the electromagnet to control the device. When the time of the accident, as part of electronic control movement, electro-magnet power, out of control Spindle lock in under the weight of the self-release spin axis, so that self-closing valves.



The butterfly valve of the hydraulic system to control the use of bis cutting butterfly valve closing speed, turn off the start of faster time to reduce the speed and rate of the sustained rise; the closure of the slow phase to control the rate of increase in water pressure.



2, technical characteristics and main technical parameters



2.1 Technical Features



Machine torch assembly with hydraulic dual-use system for the whole structure is compact, easy to operate.



In the absence of external power supply, the storage can take advantage of gravity to shutdown. When the unit has been growing too fast, the bearings overheating and loss of excitation when the generator can automatically shut down, which had automatic protection unit.



Closed with a speed of two properties.



The use of solenoid-controlled spindle lock body, a safe, reliable operation and a small force.



2.2 The main technical parameters, indicators



To D741-10-type heavy hammer-type butterfly valve as an example, the main technical data are: pressure, 1MPa; diameter, φ400, φ500, φ600, φ800, φ1000, φ1200; maximum use of head, 100m; the highest step-up head, 145m; Open time, about 5min manual, electric around 1min; closing time, fast paragraph 5 ~ 10s; slow clearance above 10 ~ 50s; the scope of protection has been growing too fast, 1.8 times the rated speed (adjustable).



3, the location and effect of specific applications



Linhai City, Zhejiang Province, Chai Tan Hydropower Station using automated equipment Zhejiang Pingyang two production D741X-10 heavy hammer-type butterfly valves. Patterns for the hybrid power station, a pressure tunnel 1100m, diameter 2.6m, the pressure of the tube length 50m, diameter 1.2m, design head 45.5m, the maximum head 47m, design flow of 1.8m3 / s, turbine HL220-WJ-50A, power generation Machine SFW-630-6/990 (excitation shunt reactor), rated voltage 400V, rated capacity of 630kW, rated speed 1000r/min. 2 January, 1991 into the largest power grid to power in March 1993, two machines running together 7780h. A good heavy hammer valve operation, the evaluation is as follows: (1) action right equipment to achieve the safe production, the two valves to open 203 times the closure of 203 times, 100% accuracy rate movements; (2) the average time to open the electric 55s, load rejection set fast time for the 5s, the first rapid increase in speed to reduce the rate of increase in the rate of 40% of control, the slow clearance time set to 20s, after the slow rate of increase is to reduce water pressure, an increase rate of 21 % of; (3) In the course of the accident unit down too fast, when more than 1.4 times the rated speed, the device made by the gun, heavy hammer automatically release the closure of inlet valves, to avoid accidents expanded security operation.



4, Conclusion



First of all, to improve the reliability of the equipment to ensure a safe shutdown. Secondly, reducing the labor intensity of workers to run to reduce the maintenance workload. Two units on duty to reduce the four, the annual savings of about 80,000 yuan.



In addition, the valve in the absence (less people) on duty or isolated grid power plant power plant when the plant lost power when the heavy hammer release can automatically shut down without having to back-up DC power to operate.



In a number of power plant design, if the unit is scheduled to GD2 and hydraulic structures under the conditions of deployment can not find a suitable guide vane closing time to ensure that the unit rate of appreciation and the appreciation pressure on the standards for no more than the allowable values at this time can be taken to speed weight bis-style butterfly valve closed, the first in order to reduce the speed quickly increased, the latter can reduce the water pressure slowly increased. This method is reliable than setting artificial resistance than economic surge tank setup. 

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Forklift CPCD60 multi-way valve-type oil Troubleshooting

Type forklift CPCD60 using ZS series, sub-chip multi-way valve, the valve including the shell, or stem from, tilt stem, reset spring safety valve, as well as components such as cone-shaped valve, into the oil formation in the internal Road, the working oil Road, back to the oil that spills Road and Road, the total back to the oil, so that hydraulic oil in different working conditions, Road in the oil flow to the work of a different purpose. Valve into the oil which has a mouth and into the oil pump system connected to the oil valve oil return system back to the mouth and the oil port connection, safety valve (relief valve) to control oil spills Road. CPCD60 type forklift hydraulic system rated pressure 16Mpa, flow 160L/min.



Multi-way valve leakage is the most common fault.



1, with the leakage



Multi-way valve leakage occurs, the working oil Road and back to oil spills Road Road or heart, and hydraulic oil tank directly back to complete the operation, resulting from or inability to hydraulic lifting cylinder or lifting cargo fork down and the door frame itself forward on its own, such as failure. Leakage within the cause and rule out the method is:



(1) with the valve stem is too large gap between the wear and tear



Multi-way valve lift and tilt of the stem on each of the three grooves, groove and oil Road can be connected with or cut off the circuit to change the work. Good distribution of the valve stem with a small gap between the valve body, very little oil, so a drop or tilt hydraulic cylinder is very small, does not affect the work. However, excessive wear and tear clearance, the hydraulic oil pump in the workplace under pressure, it will result in oil Road back to the oil and oil spills Road Road or similar, automatic return to the tank. The cause is mainly due to the allocation of long-term use of valves or dirty oil, such as the stem and the valve body to speed up the wear and tear with damage to the sealing surface, resulting in oil spills. Repair minor wear and tear if the stem may be polished chrome-plated stem; if stem serious wear and tear, it needs to be replaced.



(2) between the oil body



Road as a result of the oil return to the oil that spills Road runs through the body between the three single-chip, so the seal between the valve body require, Body Oil and Body Road after installation O-ring, with bolts to connect the valve body from Wild to the purpose of sealing.



If the solid bolt torque different body may lead to warpage. Seal failure, resulting in leakage; performance if the body installed O-ring damage or aging or damage, in the oil under the valve body is also prone to leakage between. Repair, if the need for grinding valve damage, the replacement of O-ring, and the order and bolt tightening torque requirements.



(3) safety valve spring failure



Safety valve for regulating the system pressure, the pressure to maintain a certain range to prevent overloading and hydraulic cylinder piston position to the limit or for other reasons, the hydraulic system caused by damage to the components. Safety valve will be primarily by elastic spring ball pressure reached in the open valve position, the purpose of clearance. When the hydraulic pump output exceeds the set value, the high-pressure oil to overcome some of the pressure on oil by high-pressure safety valve to return oil tank Road. When the oil is up to the required value, the spring preload in the role of their own, the ball will be pressed in the valve position, the safety valve to close.



If the safety valve spring failure, hydraulic oil pressure below the system requirements can be forced to leave the ball valve inflow of oil spills that resulted in leakage, the system failure. Spring must be replaced when the repair, and then use the adjustment screw to adjust the spring pressure on the provisions of 14 Mpa. Adjustment from the load center in accordance with the demand for 600mm Department 7.5t load of goods, when goods may from time to time from the non-locking with locking nut, the pressure at this time is the need to adjust the pressure.



(4) multi-way valve can not be reset under



Stem reset spring installed in the bottom of the stem, regardless of stem position in the top or at the next spring can be compressed so that, in the absence of external force, due to the elastic spring to make stem the rapid return to its original location. If the stem can not be reset, Trench Road, connected with the oil will be produced within the leak. First, as a result of stem deformation or damage to reset the spring, spring can not reduce the elastic stem back in situ, to be replaced to repair the spring; second valve between the unclean and the stem, have a greater resistance to stem reduction difficult, repair to be cleaning the internal multi-way valve to eliminate the resistance.



(5) cone valve wear



Cone oil is used to prevent backflow valve. If the cone valve wear, oil clearance Mission Road, lax, the hydraulic oil will return to system failure. Repair, should be into the grinding or replaced. The elimination of the return.



2, valve oil leakage



Valve stem seal and O-ring on to achieve, if aging or damaged seals, in the system of hydraulic oil under pressure will flow along the stem, resulting in leakage of the oil body. Simply rule out the possibility that this failure to replace the O-ring. 

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(c)Heating valve commonly used on the project

1.5 Check valve

     Also known as check valve, single-stream doors. A commonly used valves play a supporting role.

     Working principle: to rely on its own strength as well as the fluid valve of self-respect, automatic gate valve. As the name suggests, its role is to prevent the media back. Generally installed in the export pumps to prevent water hammer damage to the pump.

     Commonly used in heating projects have the level of take-off and landing type (H41H), Single Swing (H44H), double valve butterfly (H77H).

     Directional non-return valve must not be anti-loaded. Different forms of non-return valve, according to their structure, have a fixed installation, must not be installed wrong. The level of jack-up can only be installed in the horizontal tube on the road, and ensure the valve in a vertical state; Single Swing can only be installed in the horizontal tube on the road, and ensure the valve shaft at the level of state; double butterfly valve can be installed.

     1.6 Control Valve

     Also known as throttle. Secondary heating system is a network of valves used.

     Working principle of: shape, structure and a similar cut-off valve. Vice different is sealed, the valve control valve similar to valve and valve seat of the cork and bottle vacuum bottle, through the movement of valve area changed to regulate the traffic flow. In the valve axis, said there is a corresponding flow gauge.

     Role: regulating the distribution of pipe flow between the media in order to achieve thermal balance.

     Heating projects have been using a straight-through processing (T41H), but it has some shortcomings: flow resistance, and should not be mounted vertically. So as technology advances, balance valve (PH45F) instead of regulating valve.

     1.7 Valve

     Improved control valve. DC-type flow, PTFE valve seat changed;

     Overcome the shortcomings of large flow resistance, while two additional advantages: a more reasonable seal, both cut-off function.

     Thermal heating station project in the second-line use, with excellent flow regulating characteristics, especially suitable for variable flow systems.

     Directional, can be installed level can also be mounted vertically.

     1.8 Self-Balance Valve

     Also known as flow control valves. Its working principle is: there is a valve spring and rubber membrane body, which connect with the stem. If the flow increases, resulting in an imbalance in its power, the valve moving to shut down in order to reduce the flow area to reduce the flow, so that the return flow settings. And vice versa. This has always been to maintain the same flow after valve to control flow purposes.

     Heating system installed in the thermal population, branch point. Automatic elimination of hydraulic imbalance, improve system performance, the realization of economic operation. Self-directional balance valve not installed anti-.

     In addition, there is the use of environment on corrosion and protection of the valve problem, medium on the valve's internal corrosion and protection issues, as well as temperature and pressure sealing and leakage problems. In short, the valve is small, a lot of learning to be for us to summarize continuous learning.

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The installation of the valve guide and practical connection method

Be sure to remember that recommended the use of the valve is, and applied to analyze the environment in order to determine the most suitable for what kind of valve installation. The valve is installed correctly before, in order to prevent damage to valves, and to ensure that the work and give full play to the performance of valves, please read the installation guide. 1. First cutting along the vertical pipe, and trim to remove burrs, diameter measurement.



2. The use of gauze or wire brush to remove parts of pipelines and cutting its shiny metal surface luminescence. Do not use steel wool recommendations.



3. In the pipeline and welding mask outside painted the internal flux, soldering flux must be completely covered surface. Please use the controlled flux.



4. To ensure that the valve is open. First heating of pipelines. As much as possible heat transfer to the valve from the pipeline. Avoid extending the heating time of the valve itself.



4a. Silver brazing methods:



Brazing of the need for assembly of parts. If allowed to apply the components in the vertical flux, and then the flux of water will be evaporated, and the flux is very easy to dry off, resulting in exposure of the metal surface is oxidized easily. In connection assembly, the pipe to insert the tube until the encounter sets up to block. Assembly is to ensure a solid support, making the whole process of brazing operation can be maintained in a straight line position.



Note: For 1-inch or greater nominal diameter of the valves, one-time components will be connected to the desired heating temperature more difficult. Throughout a large area in order to maintain a normal temperature, usually requires two torch. The proposed tube sets of the entire region of the warm-up properly. Proposed to use acetylene flame heating of the connecting parts. First, from 1 inch away from the valve where the start of the heating pipes, and then around the turn of pipe a short distance down the flame on the pipe baking, and the angle of rotation to the appropriate channels, to avoid pipeline燃脱. Flame to be continuous movement, not allowed to stay at some point.



Sleeve in the valve base with flame to bake. To be evenly heated by the flame of the valves and piping to carry out the process of baking the flames to extend to the flux valve is no longer sound. Do not over-heating of the valve.



When the flux into a liquid and in the pipes and valves on a semi-transparent state, the beginning of the flame along the axis connecting parts to act in baking, in order to maintain connectivity components, particularly parts of the valve sleeve heat base.



5. The use of an appropriate amount of solder: If you use solder wire, then DN 3 / 4 inch valve will be using 3 / 4 inches of solder, and so on. If you are using too much solder, then solder some pipes may flow to block the site, and plug the sealed area. Connected components in the installation, you can see the solder and brazing alloys continue to flow



5a. Silver brazing method:



The wire or welding rod in the valve seat in the pipeline sets. When the welding rod or wire into the junction when the flames from above to remove. When the alloy flowing into the junction, it is necessary to move the flame around. Achieve the appropriate temperature, the alloy will easily prompt shell and pipes into the space between the valve casing. After the junction was filled with, you will see the edge of welding alloy.



6. When the solder in a viscous state, the use of brushes to clean excess solder. Solder after cooling to a嵌条around the port in the valve.



Silver Brazing



If using different brazing materials, its strength brazing connections and not very good, the strength depends on the pipeline between the shell casing with a normal valve, a wide range of cleaning maintenance. Silver brazing valve casing internal diameter of mechanical tolerances and surface smoothness requirements of very precise in order to ensure that adequate adhesion.



Note: in the clean-up and removal process, should be observed carefully cleaning medium residues. Have been soiled or incorrect to carry out cleaning of the surface, brazing, welding it is difficult to satisfactory results, because silver brazing alloys will not flow through or bond in the oxides on the surface of the oil pollution and exposure, easily oxidized and lead to exclusion of the gap flux and debris.



Thread connection



Hard residue, dirt, or any external material accumulated in the pipeline are likely to prejudice the efficiency of the valve and severe damage to key components of the valve. Air or steam must be used within the pipeline to carry out thorough cleansing.



When tapping on the pipes, the pipes to the determination of the size and length of thread, to avoid the pipeline filled and the valve seat.



Thread the end of a thorough cleaning to remove any harmful steel or iron sediments. If you want a more solid when the welding, it is necessary to use Teflon tape or pipe adhesive. Thread in the pipeline can only use a small amount of adhesive pipe, but the valve must not use thread adhesives pipeline. Do not let any adhesive inflow pipe valve body in order to avoid damage to valves and valve seat.



Before installing, cut off the fluid through the valve so that the valve is working correctly. To completely shut down before installing the valve. Will be near the pipe wrench sets the hexagon bolt heads to avoid possible deformation. After the installation of valves, it is necessary to support living Pipeline: valve prolapse of the pipeline would generate a result of the failure deformation.



Flange connection



In order to ensure that the correct valve Lan connection to install, need to follow the following steps. First of all, carefully cleaning junction, and then, at the base of the Department of loosely fitted with two or three bolts. Then, carefully insert the gasket connection. Contribute to the gasket at the bottom of bolt position and to maintain proper position. And then insert the bolts to be tightened up and the use of cross-way, do not adopt the way around the tightened up, so help to eliminate the pressure of over-centralized). In normal use for some time, check to check whether all the bolts tightened and then tightened up and the necessary. 

  

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Application of occasions butterfly valve

Valve applies occasion:

Butterfly valves are widely used for flow control. As the butterfly valve in the pipe pressure loss in the large, about 3 times the gate. So, the selection valve, the piping system should be fully considered by the effects of pressure loss should be considered closed when the butterfly plate to withstand the rugged nature of medium pressure pipelines, as well as high temperatures, flexible seat material can withstand the operating temperature limits.

Butterfly the length and overall height of the structure is relatively small, open, closing speed of the block, have a good flow control characteristics, it is the most suitable framework for principles of large-diameter valves produced. When asked to use butterfly valves for control of flow, the most important choice is the right size and type of butterfly valves, which made him a more effective work.

Typically, the throttle, regulating control and slurry medium, the demand structure, the length of short, open and close speed. Low-voltage cut-off, it is recommended the use of butterfly valves.

In a double-digit adjusted necking channel, low noise, there is the phenomenon of cavitation and gasification, a small amount of leakage to the atmosphere, with corrosive media may make use of butterfly valves.

Throttle adjustment in special operating conditions or require strict sealing, or wear a serious, low-temperature working conditions such as use of butterfly valves, the need to use specially designed metal seal with three eccentric adjustment device or a dedicated dual-eccentric butterfly valve.

Center line butterfly valve for applications that require to be fully enclosed, gas leak to another, require a higher life expectancy, working temperature -10-150 degree of fresh water, sewage, water, salt water, steam, gas, food, medicine, oil and the kinds of acid-base and other pipes on the road.

Soft-eccentric butterfly valve for the bi-directional ventilation and dust removal pipe hoist and regulation, widely used in metallurgy, light industry, electric power, petroleum chemical system of gas pipelines and waterways.

Metal on metal wire seal double eccentric butterfly valve for urban heating, gas, water and gas, oil, acid and alkali and other pipelines, as the regulation and closure devices.

Metal on metal surface sealing three-eccentric butterfly valve not only as large-scale pressure swing adsorption gas separation unit process control valves used, can be widely used in petroleum, petrochemical, chemical, metallurgy, electric power and other areas, is the valve, globe valve, etc. Good alternative products. 

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Gate valve manufacturers in the use of occasions and the choice of factors

In recent years, as a control valve and flow direction of water as a tool, in the form has changed. Over the past commonly used in dual-use flashlight flashlight dual butterfly valve gradually being replaced by butterfly valve has the advantage of small size, light weight, easy installation, the resistance coefficient. The disadvantage is that if the precision of fabrication and installation is not enough, or impurities in the water were more easily lead to lax leaking valve closure phenomenon, whereas the traditional valve leaks are hard, but the size large; in particular, a large diameter gate valve, but also large and bulky install the demolition is not easy; more importantly, due to large volume, leading to an area of increased pumping station, construction costs increase. Therefore, pumping station design, tendering selected valve should consider the following two questions:

     1 Use

Use of non-space restrictions, debris in the water more, easy to plug in an important position of the valve, dual valve flashlight can be used; contrary valve can be used, in particular, used in the pumping station renovation project in the butterfly valve can be used for the effective use of existing pumping station space, to achieve the same area of the former pump house under the premise of increased supply (row) of water purposes.

     2 manufacturers

Choose a larger scale, a longer productive life, prestige, quality clearance and be responsible for installation and commissioning of the valve manufacturers. With the butterfly processing accuracy continues to improve, the quality will get better and better, leakage problems would be solved, when the butterfly valve will replace the old valve, which is the development trend of valves. 

 

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Hydraulic control valve to raise the water level and stable operation of

People are familiar with the "pump" is a potential to increase the mechanical equipment, such as the main water pump is to raise the water level or increase the water pressure, and "pump" is a natural from the air, water or soil to obtain low thermal , acting through the power output can be used by people of high-grade thermal equipment, is an energy-saving, environmental protection, clean and hot water heating equipment, heat pump technology in recent years has drawn greater attention in the world of new energy technologies.



How to understand "heat pump"?



Here is a simple example, a few liters of gasoline consumption car could be a few tons of cargo from one place to another place, heat pump unit would be able to absorb heat from the natural heat pump through the "removal" (Work-driven heat pump power), access can be used for the production of life energy.



There are several heat pump?



According to different sources of heat, heat pumps can be divided into air-source heat pump, water source heat pump and ground source heat pump.



Solar heat pump water heater is the product?



Broadly speaking Yes, but with the conventional heat pump unit has a solar energy products is fundamentally different, mainly reflected in the different working principle: we must rely on conventional solar product exposure to direct sunlight or heat radiation system to achieve results, and Heat Pump mainly of heat absorption of the environment to achieve the heating effect.



What is the principle of heat pump units to carry out mining in accordance with heat?



Heat Pump Equipment Purchase a specially heat-absorbing medium - refrigerant, its liquefied state in less than minus 20 ℃, with the outside world there is a temperature difference between the temperature, the refrigerant can absorb heat from the outside world, internal evaporation in the evaporator vaporization through the heat pump unit in the refrigerant compressor to raise the temperature of the work, and then through the condenser so that refrigerant from the vaporization of the state into a liquefied state, in the transformation process, the release of a large number of heat transfer to the reserve tank of water, so that the water temperature increased, reaching the purpose of the hot water system, which is the product unique is also the reason the market potential.



Heat exchanger in the heat pump unit, then is it really necessary to run-time use of electricity?



To electricity, but electric-driven heat pump only from the outside in the environment to absorb heat, and heat released by hot water heating, rather than as electricity as conventional electric water heaters heat water directly, they use very little electricity.



Heat Pump heating compared with other What are the advantages?



Heat pump units are mainly embodied in the following: high efficiency, energy saving, environmental protection, safety. Non-combustible, explosive gas could be no promotion of electrical components, the absolute security; without any emission, waste water, waste residue discharge, absolutely environmental protection, heat pump unit operating costs average only direct electrical heating of 1 / 4, fuel, gas heating 1 / 3 ~ 1 / 2, 1/1.5 conventional solar energy.



The first phase of the recovery cycle of investment and how?



Heat pump units than the initial investment in fuel, gas boiler, slightly higher, but because of its unique energy-saving effect, usually within a year and a half way through the energy cost recovery, boilers and other heating methods, only five years of general life , and heat pump units for up to fifteen years of life.



Air heat pump power consumption is generally the number of units?



Tianshu air to the thermal efficiency of heat pump units are generally 300% -500% to 40 ℃ temperature rise, the production of one ton of hot water consumption of about 9-15 degrees. The approach requires an ordinary electric heating power consumption of 52 degrees.



Air heat pump hot water unit to the use and operation of simple?



The use of very simple, intelligent automation of the unit control system, the user only when the initial use of the power to open, in the future use of the process of fully automated operation, to reach a user-specified shutdown automatically when the water temperature, which is lower than the water temperature at user-specified system of self - switched completely to achieve 24 hours a day, at any time without having to wait for hot water. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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