In the single-family gas furnace heating system, if there is no heating temperature control valve, when the little stove, all of the heating are hot, the user can only adjust the water temperature on the furnace and the furnace start-stop setting. But also has a temperature control valve can be used not only the product itself free heat (such as electrical heat, the body heat, solar energy, etc.) energy-saving, more importantly, there is now a temperature control valve, the user can sub-room temperature control, select the heating .
We have a floor area of 89m2 of Ershiyiting a Methodist home, five groups of different heating the house situation, and so the experiment. Only big lie in this Unit Chaoyang. Stove water temperature set at 4 file (about 60 ℃ or so), outdoor temperature is 0-10 ℃ about family day was simulated experimental results are as follows:
Case 1: There is no temperature control valve, the room temperature maintained at around 20 ℃
The average gas consumption of 0.57m3 / h. 120 days per heating season, gas fee is 1.7 yuan / m3, at a cost of 0.57x24 hours x120 days x1.7 = 2790.72 Yuan. Comprehensive consideration cold weather gas consumption increase, sometimes longer heating period, water temperature may be set higher, and the user may not be all day with hot, etc., in which case a heating period, heating costs should be 2,500 yuan -- about 3,000 yuan, or 28 yuan / m2-34 Yuan / m2, compared with the high cost of central heating.
Case 2: with Gan Poor temperature control valve, all the temperature control valve settings put three, that is, the room temperature about 20 ℃
The average gas consumption of 0.42m3 / h. A heating period at a cost of 0.42x24 hours x120 days x1.7 = 2056.32 Yuan. Comprehensive consideration, in which case the cost of a heating period should be around 1,700 yuan -2,300 yuan, or 19.1 yuan / m2-25.8 Yuan / m2, and the central heating costs are considerable. Compared with the situation of an energy saving about 25%. This energy is entirely caused by the product itself.
Case 3: Gan Poor temperature control valve is equipped with daytime living room temperature control valve set at 20 ℃ (scale 3), the evening set at 8 ℃ (scale *); large horizontal temperature control valve set at 20 ℃ ( scale 3), daytime set at 12 ℃ (scale 1); a small horizontal temperature control valve set at 20 ℃ (scale 3), daytime set at 6 ℃ (scale *); the temperature control valve toilets and toilet-wide days set at 6 ℃ (scale *) Average air consumption 0.28m3 / h. A heating period at a cost of 0.28x24 hours x120 days x1.7 = 1370.88 Yuan. Comprehensive consideration, in which case the cost of a heating period should be around 1,100 yuan -1,500 yuan, or 12.4 yuan / m2-16.9 Yuan / m2, lower than the cost of central heating. Compared with the situation of an energy saving about 50%. This energy is the product itself and the user's own actions brought about.
The absence of thermostatic valve system transformation, 5 temperature control valve to only invest in 1000-1200 yuan, a year to recover the investment, reform is also very easy.
The best adjustment method using the temperature control valve
1) Long-term unoccupied rooms and kitchen, bathroom and other places: the temperature setting to 6 ℃ (scale *), right and up and down the room's heating system for frost protection of water systems can be.
2) For the resident's bedroom: daytime temperature setting to 12 ℃ -30 ℃ (scale 1-3 between the virtue of each specific sense of setting may be), to guarantee a certain room temperature, so as not at night into the room, room temperature is too low, affecting comfort. Before going to sleep time, set at 20 ℃ (scale 3), sleep set at 16 ℃ (scale 2), because people go to bed at night covered with blankets, the room temperature should not be too high.
3) For the living room: the day the temperature set to 20 ℃ (scale 3), night may be set at 16 ℃ (scale 2).
For office workers, is not recommended to go to work after the shutdown. Because the shutdown, the room temperature would drop more common. Point furnace after work, the room temperature if necessary up to 20 ℃ for several hours, but can not even save money. For families with infants and the elderly, some room temperature need to be set at around 24 ℃ (scale 4), when the water temperature of the stove to set the need to increase to around 80 ℃, or room temperature may not go up.
The use of gas-fired furnace heating Attention
For the central heating users, your home is only the end of heating, as long as heating does not leak, you Needless to worry about other things. Even if your house unoccupied during the winter, your home heating is also usual heating, protection system and the upper and lower the water will not be damaged by frost. The gas furnace user is different, the entire heating system from the heat source to the end-all in the home, can be described as small but fully-equipped one. For not heating the whole by the user own control. Is therefore most important is that if your house unoccupied during the winter, then do not forget you still need to heat the room, or home heating system and water system piping has been up and down the danger of Frost Crack. Buried pipelines are basically now, once the pipeline damaged by frost and repair damage on the ground when you need to bring the loss should not be underestimated. So for this situation, if you are only short-term leave home, just when you leave home all of the temperature control valve located at 6 ℃ (scale *), gas furnace set at the low water temperature about 35 ℃; if do not live long in the winter, please have a friend or the property will be up and running on your system, so that not only spend less, while protecting the system.
In such a heating system at their own expense, the most appropriate to install heating cover. Because doing so would reduce the amount of heating of the heat. Compared with the next installation of heating, to achieve the same room temperature, the user must spend more this effect will be more than 30% of the money. At the same time in the selection thermostatic valve, we must pay attention to product quality, as some low-grade temperature control valve 2-5 years after the use of the role will lose temperature.
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Monday, March 7, 2011
Saturday, March 5, 2011
Solenoid valve and the structure of knowledge of the Selection Principle (a)
I: the applicability of
The fluid lines must be selected solenoid valve calibration model in the same medium.
Fluid temperature must be less than the selected temperature calibration solenoid valve.
Solenoid valve to allow liquid viscosity 20CST generally less than 20CST should be specified.
Working pressure, maximum pressure pipeline should be chosen in less than 0.04MPa as ZS, 2W, ZQDF, ZCM Series such as moving straight and direct step-by-step type; minimum working pressure can be selected when more than 0.04MPa Pilot - (pressure type) electromagnetic valve; maximum working pressure solenoid valve should be less than the maximum calibration pressure; generally are one-way solenoid valve, so pay attention to whether there is anti-pressure, if the installation of a non-return valve.
Fluid cleanliness is not high in the solenoid valve should be installed before the filter, the general electromagnetic
Valve cleanliness requirements of the media better.
Attention to flow and take over the aperture diameter; solenoid valve generally only two control switches; conditions permit, please install the bypass pipe, to facilitate maintenance; the phenomenon of water hammer when the solenoid valve to customize the opening and closing time to adjust.
Environmental temperature on the impact of the electromagnetic valve
And consumption of power supply current output capacity should be based on selection, the general allows the supply voltage of about ± 10%, it is important to start the exchange of high value when the VA.
Second, the reliability of
Normally closed solenoid valve is divided into two kinds of open and regular; general selection-type normally closed, power open, power closed; but in a very long time to open a very short time to close the normally open type of selection.
Life test, factories are generally the type of pilot projects, specifically in our country has not the professional standard of solenoid valve, solenoid valve manufacturers, therefore, when chosen carefully.
Moves a short period of time generally select high frequency straight type, the rapid series of large-caliber selection.
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The fluid lines must be selected solenoid valve calibration model in the same medium.
Fluid temperature must be less than the selected temperature calibration solenoid valve.
Solenoid valve to allow liquid viscosity 20CST generally less than 20CST should be specified.
Working pressure, maximum pressure pipeline should be chosen in less than 0.04MPa as ZS, 2W, ZQDF, ZCM Series such as moving straight and direct step-by-step type; minimum working pressure can be selected when more than 0.04MPa Pilot - (pressure type) electromagnetic valve; maximum working pressure solenoid valve should be less than the maximum calibration pressure; generally are one-way solenoid valve, so pay attention to whether there is anti-pressure, if the installation of a non-return valve.
Fluid cleanliness is not high in the solenoid valve should be installed before the filter, the general electromagnetic
Valve cleanliness requirements of the media better.
Attention to flow and take over the aperture diameter; solenoid valve generally only two control switches; conditions permit, please install the bypass pipe, to facilitate maintenance; the phenomenon of water hammer when the solenoid valve to customize the opening and closing time to adjust.
Environmental temperature on the impact of the electromagnetic valve
And consumption of power supply current output capacity should be based on selection, the general allows the supply voltage of about ± 10%, it is important to start the exchange of high value when the VA.
Second, the reliability of
Normally closed solenoid valve is divided into two kinds of open and regular; general selection-type normally closed, power open, power closed; but in a very long time to open a very short time to close the normally open type of selection.
Life test, factories are generally the type of pilot projects, specifically in our country has not the professional standard of solenoid valve, solenoid valve manufacturers, therefore, when chosen carefully.
Moves a short period of time generally select high frequency straight type, the rapid series of large-caliber selection.
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Pneumatic control valve maintenance
Pneumatic control valve is widely used in petroleum chemical industry is one of the instrument. It is precisely to work properly in ensuring the normal operation of process plants and production safety have an important significance. Therefore, strengthening the pneumatic valve repair is necessary.
First, repair parts, when the focus of inspection
Check between the body wall: In high-pressure differential and corrosive media of the occasion, body wall, diaphragm of the diaphragm often media impact and corrosion, we must focus on examination of pressure decay;
Check Seat: Due to the work of media penetration, fixed seat screw used in the inner surface susceptible to corrosion Ershi seat relaxation;
Check spool: spool valve to regulate one of movable parts, subject to more severe erosion of the medium, repair should be careful when you check the valve core ministries is corrosion, wear and tear, especially in the case of high-pressure differential, spool of wear due to cavitation caused by cavitation phenomenon is even more serious. Were seriously damaged valve core should be replaced; check Filler: Check the packing asbestos rope is dry, such as the use of PTFE packing, should pay attention to check whether the aging and its mating surface is damaged;
Check the executive body of the rubber membrane is aging, whether the cracking phenomenon.
2, pneumatic control valve with daily maintenance
When the control valve using graphite asbestos as a filler, the filler should be about three months to add a lubricant to ensure the control valve and flexible easy to use. Found filling pressure cap low, should be added fillers, such as found in the dry filler PTFE B sclerosis, should be promptly replaced; should pay attention to inspection tour of the operation of control valve, check valve position indicator and regulator the output is consistent; to have locator control valve should always check the gas source, identify problems and timely treatment; should always maintain a control valve components of health as well as a complete easy to use.
3, common faults and their causes
(A) the control valve does not move. Phenomenon and the reasons for failure are as follows:
1. No signal, no gas source. ① gas source is not open, ② gas supply due to water freezing in the winter, leading to blocked ducts or filters, valve block failure, ③ compressor failure; ④ source of mains gas leak.
2. There is gas source, no signal. ① regulator failure, ② the signal tube leakage; ③ bellows leak locator; ④ regulate film damaged retina.
3. No gas source locator. ① filter plugging; ② valve failure I ③ pipeline leak or blockage.
4. Positioning device has gas supply, no output. Locator orifice plug.
5. There is signal, no action. Spool off ①, ② spool with the social or stuck with the valve seat; ③ stem bending or breakage; ④ spool seat block of frozen or coke dirt; ⑤ implementing agencies do not have the spring due to the long-term rust die.
(B) the control valve moves instability. Phenomenon and the reasons for failure are as follows:
1. Pressure gas source of instability. ① compressor capacity is too small; ② valve failure.
2. The signal pressure instability. ① control system time constant (T = RC) inappropriate; ② regulator output instability.
3. A stable gas supply pressure, the signal pressure is stable, but still stable valve action. ① Locator amplifier ball wear off by the dirt loose, especially with increasing gas consumption will produce the output shock; ② Locator amplifier nozzle baffle is not parallel to baffle nozzle cover not live; ③ Output Pipe, line leak; ④ executive body rigidity is too small; ⑤ stem movement friction large parts of a block in contact with the phenomenon.
(C) regulating valve vibration. Phenomenon and the reasons for failure are as follows:
1. Regulating valve opening at any vibration at all times. ① supporting instability; ② near the source of vibration; ③ spool and bushing wear serious.
2. Regulating valve near the fully closed position vibration. ① big selection valve, often used in small openings; ② single-seat valve media flow on and off in the opposite direction.
(D) regulating valve movements slow. Slow phenomenon, and the following reasons:
1. Stem only in one direction when the slow movement. ① pneumatic membrane leakage of the implementing agencies in the membrane damage; ② implementing agencies in the "O" type seal leakage.
2. When the stem at reciprocating movements are slow phenomenon. ① valve body with sticky material to plug; ② sclerosis or graphite PTFE packing deterioration of asbestos packing a dry lubricant; ③ packing too tightly increases, friction increases; ④ stem not directly lead to friction due to large; ⑤ No The pneumatic control valve positioner can lead to slow movement.
(E) increase the amount of valve leakage. Leakage of the following reasons:
1. Valve fully closed when the leakage of large quantities. ① spool is worn to a serious internal leakage, ② strictly off valve is not a good tune.
2. Valve fail to fully closed position. ① medium pressure too great, the executing agency rigidity is small, loose valve closed; ② of a foreign body within the valve; ③ sintered bushing.
(F) adjustable flow range becomes smaller. The main reason is corrosion smaller spool, so that the minimum flow rate adjustable larger.
Pneumatic control valve failure to understand the phenomenon and the reasons to be symptomatic to take measures to resolve it.
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First, repair parts, when the focus of inspection
Check between the body wall: In high-pressure differential and corrosive media of the occasion, body wall, diaphragm of the diaphragm often media impact and corrosion, we must focus on examination of pressure decay;
Check Seat: Due to the work of media penetration, fixed seat screw used in the inner surface susceptible to corrosion Ershi seat relaxation;
Check spool: spool valve to regulate one of movable parts, subject to more severe erosion of the medium, repair should be careful when you check the valve core ministries is corrosion, wear and tear, especially in the case of high-pressure differential, spool of wear due to cavitation caused by cavitation phenomenon is even more serious. Were seriously damaged valve core should be replaced; check Filler: Check the packing asbestos rope is dry, such as the use of PTFE packing, should pay attention to check whether the aging and its mating surface is damaged;
Check the executive body of the rubber membrane is aging, whether the cracking phenomenon.
2, pneumatic control valve with daily maintenance
When the control valve using graphite asbestos as a filler, the filler should be about three months to add a lubricant to ensure the control valve and flexible easy to use. Found filling pressure cap low, should be added fillers, such as found in the dry filler PTFE B sclerosis, should be promptly replaced; should pay attention to inspection tour of the operation of control valve, check valve position indicator and regulator the output is consistent; to have locator control valve should always check the gas source, identify problems and timely treatment; should always maintain a control valve components of health as well as a complete easy to use.
3, common faults and their causes
(A) the control valve does not move. Phenomenon and the reasons for failure are as follows:
1. No signal, no gas source. ① gas source is not open, ② gas supply due to water freezing in the winter, leading to blocked ducts or filters, valve block failure, ③ compressor failure; ④ source of mains gas leak.
2. There is gas source, no signal. ① regulator failure, ② the signal tube leakage; ③ bellows leak locator; ④ regulate film damaged retina.
3. No gas source locator. ① filter plugging; ② valve failure I ③ pipeline leak or blockage.
4. Positioning device has gas supply, no output. Locator orifice plug.
5. There is signal, no action. Spool off ①, ② spool with the social or stuck with the valve seat; ③ stem bending or breakage; ④ spool seat block of frozen or coke dirt; ⑤ implementing agencies do not have the spring due to the long-term rust die.
(B) the control valve moves instability. Phenomenon and the reasons for failure are as follows:
1. Pressure gas source of instability. ① compressor capacity is too small; ② valve failure.
2. The signal pressure instability. ① control system time constant (T = RC) inappropriate; ② regulator output instability.
3. A stable gas supply pressure, the signal pressure is stable, but still stable valve action. ① Locator amplifier ball wear off by the dirt loose, especially with increasing gas consumption will produce the output shock; ② Locator amplifier nozzle baffle is not parallel to baffle nozzle cover not live; ③ Output Pipe, line leak; ④ executive body rigidity is too small; ⑤ stem movement friction large parts of a block in contact with the phenomenon.
(C) regulating valve vibration. Phenomenon and the reasons for failure are as follows:
1. Regulating valve opening at any vibration at all times. ① supporting instability; ② near the source of vibration; ③ spool and bushing wear serious.
2. Regulating valve near the fully closed position vibration. ① big selection valve, often used in small openings; ② single-seat valve media flow on and off in the opposite direction.
(D) regulating valve movements slow. Slow phenomenon, and the following reasons:
1. Stem only in one direction when the slow movement. ① pneumatic membrane leakage of the implementing agencies in the membrane damage; ② implementing agencies in the "O" type seal leakage.
2. When the stem at reciprocating movements are slow phenomenon. ① valve body with sticky material to plug; ② sclerosis or graphite PTFE packing deterioration of asbestos packing a dry lubricant; ③ packing too tightly increases, friction increases; ④ stem not directly lead to friction due to large; ⑤ No The pneumatic control valve positioner can lead to slow movement.
(E) increase the amount of valve leakage. Leakage of the following reasons:
1. Valve fully closed when the leakage of large quantities. ① spool is worn to a serious internal leakage, ② strictly off valve is not a good tune.
2. Valve fail to fully closed position. ① medium pressure too great, the executing agency rigidity is small, loose valve closed; ② of a foreign body within the valve; ③ sintered bushing.
(F) adjustable flow range becomes smaller. The main reason is corrosion smaller spool, so that the minimum flow rate adjustable larger.
Pneumatic control valve failure to understand the phenomenon and the reasons to be symptomatic to take measures to resolve it.
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How to choose according to the valve flow characteristics
Valve fittings and valves open and close the channel shape of the valve has a certain flow characteristics. In selecting valve, you must take this into account.
1. Cut off media access and use the valve
Often choose a smaller flow resistance, the channel for the straight-through valve. Such valves are gate valve, globe valve, plunger valve. Valve closed down, due to channel twists and turns, the high flow resistance than other valves, solid little choice. However, in allowing a higher flow resistance of the settings, they may choose closed-type valve.
2. Control the flow valve used in
Is usually easy to regulate flow of the election off valves, such as the control valve, throttle valve, plunger valve, the valve seat because of its size and hoist parts trips proportional relationship between the Cheng Wang. Rotary (eg, plug valves, ball valve, butterfly valve) and the wedge body style song (clip tube valves, diaphragm) can also be used for throttle valve control, but usually only in a limited range of the valve diameter to apply. In most cases, people often change the shape of cut-off valve made after throttling valve flap to use. Should be noted that by changing the valve opening or closing valves to achieve a high degree of cutting role is extremely unreasonable, because the pipeline throttling state media in a high velocity, sealing face susceptible to erosion, wear and tear, loss of cut, seal effect. Similarly, using the throttle as the cut-off device is unreasonable.
3. Commutated shunt with valve
According to the need for the diversion, this valve may have three or more channels, appropriate selection of plug valves and ball valves. Most of the change to the shunt valve used in such valves are optional. In some cases, other types of valves with only two or more properly connected with each other, but also can be used for the streaming media.
4. With suspended particles in the medium used in the valve
If the media with suspended particles, the most appropriate use of its open and close the sliding pieces along the sealing surface of the valve with a wipe effect, such as the flat valve.
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1. Cut off media access and use the valve
Often choose a smaller flow resistance, the channel for the straight-through valve. Such valves are gate valve, globe valve, plunger valve. Valve closed down, due to channel twists and turns, the high flow resistance than other valves, solid little choice. However, in allowing a higher flow resistance of the settings, they may choose closed-type valve.
2. Control the flow valve used in
Is usually easy to regulate flow of the election off valves, such as the control valve, throttle valve, plunger valve, the valve seat because of its size and hoist parts trips proportional relationship between the Cheng Wang. Rotary (eg, plug valves, ball valve, butterfly valve) and the wedge body style song (clip tube valves, diaphragm) can also be used for throttle valve control, but usually only in a limited range of the valve diameter to apply. In most cases, people often change the shape of cut-off valve made after throttling valve flap to use. Should be noted that by changing the valve opening or closing valves to achieve a high degree of cutting role is extremely unreasonable, because the pipeline throttling state media in a high velocity, sealing face susceptible to erosion, wear and tear, loss of cut, seal effect. Similarly, using the throttle as the cut-off device is unreasonable.
3. Commutated shunt with valve
According to the need for the diversion, this valve may have three or more channels, appropriate selection of plug valves and ball valves. Most of the change to the shunt valve used in such valves are optional. In some cases, other types of valves with only two or more properly connected with each other, but also can be used for the streaming media.
4. With suspended particles in the medium used in the valve
If the media with suspended particles, the most appropriate use of its open and close the sliding pieces along the sealing surface of the valve with a wipe effect, such as the flat valve.
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Corrosive media, operating conditions, how to choose chemical valve
In the corrosive medium operating conditions of valves, anti-corrosion chemical equipment is the most critical areas, if not the correct choice of chemical industry valve metal materials, a little carelessly, ranging from damage to equipment, while in causing the accident or even lead to disaster . According to relevant statistics, chemical equipment, about 60% of the damage caused due to corrosion, so the selection of equipment in the chemical industry should pay attention to when the first selection of the scientific. Usually there is a misunderstanding that the stainless steel is "Universal", no matter what the media and environmental conditions Pengchu stainless steel, this is not true, and it is very dangerous. The following media to talk about for some commonly used chemical selection points:
1. Sulfuric acid medium, as one of the strong corrosive medium, sulfuric acid is to use a very wide range of important industrial raw materials. Different concentrations and temperature of the sulfuric acid corrosion of materials vary greatly, for more than 80% concentration, the temperature is less than 80 ℃ in concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid , not used as a valve material; ordinary stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) is also limited use of sulfuric acid. Therefore, transport of sulfuric acid pump and valve are usually high-silicon cast iron (casting and machining difficult), high alloy stainless steel (alloy No. 20) manufacturing. Fluorine plastic has good resistance to sulfuric acid properties, using fluorine Valve (F46) is a more economical choice. If the pressure is too large, temperature, plastic valve with the points on a hit, you can choose more expensive than it has a ceramic ball valve.
2. Hydrochloric Acid must have patience to sit through most of the hydrochloric acid corrosion of metallic materials (including a variety of stainless steel material), containing molybdenum is also only be used for high-Si-Fe 50 ℃, 30% hydrochloric acid below. And metal materials, the contrary, the vast majority of non-metallic materials have good corrosion resistance, hydrochloric acid, so rubber lined pumps and plastic pumps (such as polypropylene, fluorine plastic, etc.) is the best choice for conveying hydrochloric acid. But this kind of medium, if the temperature exceeds 150 ℃, or the pressure is more than 16 kilograms, any plastic (including polypropylene, fluorine plastic or even PTFE) will not be competent, while not currently on the market have very good the valve, but you can try now emerging ceramic ball valve, this valve has the advantage of self-lubrication, torque force is small, non-aging, life span is much longer than the average over the valve, its disadvantage is that the price more higher than the plastic valve.
3. Nitric acid media, most of the general metal corrosion in nitric acid was rapidly destroyed, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel ( such as the 316,316 L) of nitric acid corrosion resistance is not only no better than ordinary stainless steel (eg 304,321), and sometimes even better. For high-temperature nitric acid, commonly used titanium and titanium alloy materials.
4. Acetic acid medium which is corrosive organic acid, one of the strongest material, ordinary iron and steel in all of the acetic acid concentration and temperature will be severe corrosion, stainless steel is an excellent acid-resistant materials, 316 stainless steel containing molybdenum can applicable to high temperature and dilute acetic acid vapor. For the high temperature and high concentrated acetic acid, or contain other corrosive media such as stringent requirements may make use of high alloy stainless steel or fluorine plastic pump.
5. Alkali (sodium hydroxide) steel is widely used in 80 ℃ below 30% within the concentration of sodium hydroxide solution, there are a number of petrochemical plants in 100 ℃, 75% is still below the ordinary iron and steel, although the corrosion increased, but the economyä½³. Ordinary alkali corrosion resistance of stainless steel for iron, compared with no obvious advantages, as long as the media were mixed to allow a small amount of iron, stainless steel is not recommended. For the high-temperature lye to use more titanium and titanium alloy or high alloy stainless steel.
6. Ammonia (ammonium hydroxide) Most of the metal and non-metal in liquid ammonia and ammonia (ammonium hydroxide) in the corrosion is very slight, only the copper and copper alloy unfit for use.
7. Chlorine (chlorine) Most of the chlorine in the corrosion resistance of metal valves are very limited, particularly in the case of chlorine with water, including various alloy valves, this case, the PTFE valve is a very good choice, but the production of chlor-alkali chemical plants will find: PTFE valve used for a long time for a little torque force increases, the problem of aging will be highlighted PTFE out, this case is fatal leak occurred in a . May consider using PTFE lined ceramic ball to replace the original core of common PTFE lined valves, the use of ceramic self-lubricating and corrosion resistance of PTFE will have perfect results.
8. Salt water (seawater) General steel in sodium chloride solution and sea water, salt water corrosion rate is not too high to be used in general coating protection; all kinds of stainless steel also has a very low uniform corrosion rate, but may be due to chloride ions caused partial corrosion, usually 316 stainless steel well.
9. Alcohols, ketones, esters, ethers common alcohol media are methanol, ethanol, ethylene glycol, propanol, etc., ketones media are acetone, methyl ethyl ketone, etc. A variety of esters of medium ester, ethyl ester, etc., ethers media are ether, ethyl ether, butyl ether, etc., they are basically no corrosive materials can be used to apply a specific use should also be under the relevant requirements of the medium properties and make a reasonable choice. Also noteworthy was the ketones, esters, ethers of a variety of rubber are soluble, the choice of sealing materials to avoid making mistakes.
There are many other media can not be introduced in this 11, in short, when you must not be arbitrary in the selection and blindness, should be more access to relevant information or learn from mature experience.
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1. Sulfuric acid medium, as one of the strong corrosive medium, sulfuric acid is to use a very wide range of important industrial raw materials. Different concentrations and temperature of the sulfuric acid corrosion of materials vary greatly, for more than 80% concentration, the temperature is less than 80 ℃ in concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid , not used as a valve material; ordinary stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) is also limited use of sulfuric acid. Therefore, transport of sulfuric acid pump and valve are usually high-silicon cast iron (casting and machining difficult), high alloy stainless steel (alloy No. 20) manufacturing. Fluorine plastic has good resistance to sulfuric acid properties, using fluorine Valve (F46) is a more economical choice. If the pressure is too large, temperature, plastic valve with the points on a hit, you can choose more expensive than it has a ceramic ball valve.
2. Hydrochloric Acid must have patience to sit through most of the hydrochloric acid corrosion of metallic materials (including a variety of stainless steel material), containing molybdenum is also only be used for high-Si-Fe 50 ℃, 30% hydrochloric acid below. And metal materials, the contrary, the vast majority of non-metallic materials have good corrosion resistance, hydrochloric acid, so rubber lined pumps and plastic pumps (such as polypropylene, fluorine plastic, etc.) is the best choice for conveying hydrochloric acid. But this kind of medium, if the temperature exceeds 150 ℃, or the pressure is more than 16 kilograms, any plastic (including polypropylene, fluorine plastic or even PTFE) will not be competent, while not currently on the market have very good the valve, but you can try now emerging ceramic ball valve, this valve has the advantage of self-lubrication, torque force is small, non-aging, life span is much longer than the average over the valve, its disadvantage is that the price more higher than the plastic valve.
3. Nitric acid media, most of the general metal corrosion in nitric acid was rapidly destroyed, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel ( such as the 316,316 L) of nitric acid corrosion resistance is not only no better than ordinary stainless steel (eg 304,321), and sometimes even better. For high-temperature nitric acid, commonly used titanium and titanium alloy materials.
4. Acetic acid medium which is corrosive organic acid, one of the strongest material, ordinary iron and steel in all of the acetic acid concentration and temperature will be severe corrosion, stainless steel is an excellent acid-resistant materials, 316 stainless steel containing molybdenum can applicable to high temperature and dilute acetic acid vapor. For the high temperature and high concentrated acetic acid, or contain other corrosive media such as stringent requirements may make use of high alloy stainless steel or fluorine plastic pump.
5. Alkali (sodium hydroxide) steel is widely used in 80 ℃ below 30% within the concentration of sodium hydroxide solution, there are a number of petrochemical plants in 100 ℃, 75% is still below the ordinary iron and steel, although the corrosion increased, but the economyä½³. Ordinary alkali corrosion resistance of stainless steel for iron, compared with no obvious advantages, as long as the media were mixed to allow a small amount of iron, stainless steel is not recommended. For the high-temperature lye to use more titanium and titanium alloy or high alloy stainless steel.
6. Ammonia (ammonium hydroxide) Most of the metal and non-metal in liquid ammonia and ammonia (ammonium hydroxide) in the corrosion is very slight, only the copper and copper alloy unfit for use.
7. Chlorine (chlorine) Most of the chlorine in the corrosion resistance of metal valves are very limited, particularly in the case of chlorine with water, including various alloy valves, this case, the PTFE valve is a very good choice, but the production of chlor-alkali chemical plants will find: PTFE valve used for a long time for a little torque force increases, the problem of aging will be highlighted PTFE out, this case is fatal leak occurred in a . May consider using PTFE lined ceramic ball to replace the original core of common PTFE lined valves, the use of ceramic self-lubricating and corrosion resistance of PTFE will have perfect results.
8. Salt water (seawater) General steel in sodium chloride solution and sea water, salt water corrosion rate is not too high to be used in general coating protection; all kinds of stainless steel also has a very low uniform corrosion rate, but may be due to chloride ions caused partial corrosion, usually 316 stainless steel well.
9. Alcohols, ketones, esters, ethers common alcohol media are methanol, ethanol, ethylene glycol, propanol, etc., ketones media are acetone, methyl ethyl ketone, etc. A variety of esters of medium ester, ethyl ester, etc., ethers media are ether, ethyl ether, butyl ether, etc., they are basically no corrosive materials can be used to apply a specific use should also be under the relevant requirements of the medium properties and make a reasonable choice. Also noteworthy was the ketones, esters, ethers of a variety of rubber are soluble, the choice of sealing materials to avoid making mistakes.
There are many other media can not be introduced in this 11, in short, when you must not be arbitrary in the selection and blindness, should be more access to relevant information or learn from mature experience.
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Sunday, January 2, 2011
Wafer Knife Gate Valve-007uk Valve supplier
Wafer Knife Gate Valve
Features:
1. Standard: API, DIN
2. Size Range: 2"-28"
3. Pressure: 150Lb-300Lb
4. Other features:
A) Handwheel torque or actuator force provides positive seat- knife closure
B) During closure, the stem slides down pushing the knife into contact with the two bottom lugs
C) The taper stem head then transfers a vertical closing force to a lateral force which positively seats the knife against the seat face
D) Stem force, not line pressure, maintains seating contact in this unique design, ensuring tight seating in both directions
E) During the opening and closing cycle, the guides ensure proper alignment of the knife
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Lug Type Knife Gate Valve-Valve manufacturers china
Lug type knife gate valve:
1)Standards:
A. Design&Manufacture: MSS SP-61
B. Face to Face: ANSI B16.10
C. Connection End: ANSI B16.5
D. Test: API 598
2)Sizes: 2" - 24" or DN50 - DN600
3)Pressure Rating: Class150 or PN6 - PN16
4)Material: WCB, WC6, WC9, C5, CF8, CF8M, CF3, CF3M, etc.
5)Operation: Manual, Gear, Pneumatic, hydraulic and Electric actuator
We can offer more Valve Technology Information.If you need us according your spcification to produce the Valve Technology .
Need, please e-mail to valve401@gmail.com
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