Electric control valve is how to use and maintenance?

With the rapid development of China's industry, the electric control valve in metallurgy, petroleum and chemical industry applications more widely, its stability, reliability has become increasingly important, it's good or bad working conditions will directly affect the automatic control process, this article will elaborate on the use of electric control valves and maintenance.



1. Installation Notes



The new design and installation of control systems, in order to ensure that the control valve while driving to work when you can make the safe operation of the system, the new valve is installed, you should first check whether the valve on the nameplate marking in line with the design requirements. At the same time the following items should also be debugged.



Basic error limit; full itinerary deviation; hysteresis; dead zone; leakage (on the occasions when demanding).



If this is the original system, regulating valve repair carried out, in addition to the above for verification, but also deal with the old valve stuffing and sealing joints and other parts to check.



Regulating valve used in the field, many are not because of quality control valve itself is caused by, but the installation of the control valve caused by improper use, such as the installation environment, installation, or improper location and direction of the pipeline due to unclean and other reasons. Therefore, the use of electric control valve is installed when you pay attention to the following aspects:



(1) control valve are on-site instruments, the Environment and temperature should be in the range of -25 ~ 60 ℃, relative humidity ≤ 95%. If it is installed in the open air or high-temperature occasion, to take water, cooling measures. In a place away from local oscillator source or increase the anti-vibration measures.



(2) regulating valve should normally be installed vertically under special circumstances can be tilted, such as the tilt angle or the valve itself is much too large weight bearing parts of the valve should be increased protection.



(3) installation of the pipeline control valve generally not from the ground or floor is too high, taller than 2m in the pipeline should be possible to set a platform to facilitate the manipulator wheel and easy maintenance.



(4) The regulating valve installed before the piping should be cleaned to remove dirt and weld slag. After installation, to ensure not to impurities left in the valve body, the valve should be cleaned again, that pass into the media so that all valves should be open in order to avoid impurities stuck. The use of hand wheel mechanism, the gap should be restored to its original position.



(5) In order to control valve in the event of failure or maintenance of the case make the production process can continue, control valve should be added to by-pass pipeline.



At the same time should also pay particular attention to valve installation location is consistent with process requirements.



(6) The electric control valve installation of the electrical part of the construction of electrical equipment shall be in accordance with relevant requirements. The case of explosion-proof products should be "an explosion in hazardous electrical equipment installation specification" requirement to install it. If on-site use of SBH-type wire or other six core or 8 core, outside diameter of about Φ11.3mm rubber installation cables. In the use and maintenance, in the explosive power off Cap maintenance of premises and the non-explosion-proof surface to pry fighting. Do not knock the same time, disassembly, or scratch injury flameproof surface, repair and after going to restore the original state of explosion-proof requirements.



(7) The executive body of the reducer overhaul should be noted that, after lubrication, low-speed motor fuel in general do not take apart and wash. It should also check the assembled valve position and valve position opening directions match.



2. Common causes of failure location and analysis



The quality of the work of control valve performance will directly affect the whole quality of the work-conditioning system. As the regulating valve in the field is in direct contact with the medium being transferred, and the work environment is very bad, so prone to failure. In the production process, in addition to always exclude these failures, but also the need for regular maintenance and periodic overhaul. In particular, the use of environment, especially the poor control valve, but also should attach importance to the maintenance and periodic overhaul.



Different forms of control valve, its failures and its causes is not the same. Sichuan Instrument Factory is the production of straight stroke electric control valve as an example to illustrate the general electric control valve fault and repair methods.



2.1 Servo Amplifiers



Servo amplifier normal working state:



(1) No input signal there should be no output voltage.



(2) open-loop dead-zone current ≤ 160μA (Ⅱ type is 100μA).



(3) The input signal> 240μA (Ⅱ type of 150μA), the output load voltage? 205 ~ 220V? AC.



(4) the output voltage are essentially symmetrical.



If the servo amplifier is not working properly, then there may be various parts of the following situations:



(1) Pre-magnetic amplifier



① No signal input, dual-film magnetic amplifier output through the potentiometer W101 adjustable to zero. Can not be zero this may be:



A, transformer W101 Sealing-off or damaged.



B, resistors R110, R111, and electrolytic capacitors C101, C102 cold solder joint or Sealing-off.



C, diode D105 ~ D108 cold solder joint or damage.



D, offset current is not normal.



E, the exchange of winding asymmetry.



② an input signal, but no output or output of asymmetry may be:



A, transformer winding currents for the exchange of B301 secondary terminal voltage asymmetry.



B, resistors R110 and R111 of the resistance has changed, electrolytic capacitors C110, C111 damage.



C, AC magnetizing winding short-circuit.



D, diode D105 ~ D108 in the individual tube is damaged or cold solder joint.



(2) flip-flop has inputs, one of the side of the trigger pulse signal oscilloscope screen should change the input signal polarity, then the other side of the flip-flops are pulsed signals. Trigger pulse number and amplitude of the two groups should be basically the same. Otherwise, the following situations.



① no input signal (pre-magnetic amplifier in the normal working state), output a trigger pulse, may be:



A, a trigger pulse output side of the transistor is damaged, or c, e very cold solder joint.



B, resistors R204, R205, R208, R209 resistance have changed.



② an input signal, no output trigger pulse, may be:



A, no output pulse at the side of the transistor, UJT damage.



B, no output pulse at the side of the pulse transformer primary or secondary open circuit or short circuit.



C, no output pulse at the side of the diode (D207 or D208) short-circuit.



③ the output trigger pulse is not normal and the following phenomena:



A, no signal sets flip-flop has a pulse output, plus all the normal after the signal may be fake solder electrolytic capacitor C202 or C203.



B, both sides began to flip-flop outputs are normal, working for some time, the output pulse gradually disappeared, it may UJT problems.



C, the output appears positive and negative pulses, may be diodes D207, D208 has been breakdown or cold solder joint.



(3) After the above inspection and maintenance, trouble-free in the case of the control loop servo amplifier should be able to work properly. Otherwise, the following two situations:



① no input signal, there is the output voltage (voltage close to 220VAC) you may be:



A, thyristor SCR1, SCR2 damage.



B, capacitor C301, C302 is the breakdown.



② an input signal, no output signal or output voltage is low, it may be:



A, diode D301 ~ D308 has been breakdown.



B, thyristor SCR1, SCR2 damage.



2.2 Control Valve



4 ~ 20mA input signal, regulating valve stem can be rated as the signal changes within the travel, the next move freely. If they can not function normally, you may have the following breakdown:



① manipulator wheel paresthesia



A, felt too light and may be hand-sold off or broken wheel card.



B, feeling too much, or spin unchanged. There are foreign bodies Casey reducer; spool and liner, or stuck with the valve seat; stem a serious bent.



② Input 4 ~ 20mA signal, control valve does not move.



A, the system wiring is incorrect.



B, motor phase capacitor CD is damaged.



C, electrical wiring open.



D, spool or the valve stem is broken off (the executing agency take any action at this time)



③ Input 4 ~ 20mA signal, regulating valve rated to go endless journey.



A, differential transformer position is not a good tune.



B, diode D701 ~ D712 in the individual damaged.



C, transistor BG701 damage.



(4) on-site use of other failures.



① valve shocks, tweet.



A, sensitivity adjusted too high, the executive body oscillation.



B, too much fluid pressure changes, the implementing agency under thrust.



C, control valve selection big, valves often work in a small opening.



D, medium flow direction and valve closure in the same direction.



E, near the other focal impact, support unstable.



F, spool and bushing wear serious.



② valve moves slow.



A, medium viscosity too big, there are blockages or coking phenomena.



B, packing aging, packing presses too tight.



③ large amount of leakage.



A, spool or the valve seat is corrosion, wear and tear.



B, valve seat loose or corroded threads.



C, valve seat, a foreign body on the spool.



D, a starting point for the valve (electrical open) or endpoint (electric closed) did not transfer well.



④ filler and the upper and lower junction leakage valve cover.



A, packing gland did not compress.



B, PTFE packing aging deterioration.



C, stem damage.



D, fastening nut loose.



E, damage gaskets.



Electric control valve the proper use and maintenance, not only can improve the reliability of process control can also increase the service life of electric control valves, the energy consumption of enterprises have considerable economic benefits.

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Butterfly valve product characteristics and the use of performance

Refers to the closure of parts butterfly valve (butterfly valve or plate) for the disk, rotating around the valve shaft to achieve the opening and closing a valve, the main effect in the pipeline and to reduce expenditure by cutting off. Butterfly valve gate is a disc-shaped pieces of the butterfly plate in the valve body around its own axis of rotation, or adjustments to achieve the purpose of headstock. Butterfly full-to full-clearance is usually less than 90 °, and the butterfly stroke butterfly valve is not self-locking capability, the positioning plate to butterflies, it is necessary to install the worm gear reducer stem. The use of worm gear reducer, not only with self-locking butterfly board so that board butterflies stop at any position, but also to improve the valve performance.



Industry-specific characteristics of butterfly valves to high temperature, the scope of the application of higher pressure, valve DN, and the use of carbon steel valve manufacturers, valve plate metal ring seals instead of rubber ring. The use of large-scale high-temperature steel welding butterfly valve manufacturer, mainly for high-temperature medium duct smoke and gas pipelines.



The benefits of butterfly valves as follows:



1, gate to facilitate the rapid, energy, fluid resistance small, operate on a regular basis.



2, simple structure, small size, light weight.



3, the mud can be transported in the pipeline at least I accumulated liquid.



4, under low pressure, can achieve a good seal.



5, regulation of performance.



Butterfly shortcomings are as follows:



1, the use of pressure and working temperature range small.



2, poor sealing.



Butterfly valve according to the structure of the form of bias can be divided into the plate, vertical plate, inclined plate and leveraged. Sealed in accordance with the form can be divided into relatively closed and hard-sealed type two. Generally use the soft rubber type sealing ring seal, hard seal ring-type metal seal used.



By the connection type can be divided into the flange connection and connect to the clip-on; by the way can be divided into manual transmission, gear transmission, pneumatic, hydraulic and electrical several.



Butterfly valve installation and maintenance should pay attention to the following:



1, during installation, the valve should be parked in the closed position.



2, the open position shall be butterfly plate to determine the rotation angle.



3, the butterfly valve with a bypass valve to open the bypass valve to open before.



4, installation manual shall be factory installed, the weight of a large butterfly, setting a solid foundation should be. 

  

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Selection of cut-off valve guide

As the valve stem and valve seat sealing surface perpendicular to the axis. Valve stem to open or close the trip is relatively short, and has very reliable cutting action, makes this valve ideally suited as a medium and cutting off or regulate the use of. Cut-off valve when the valve flap in the open position, and its valve seat and valve sealing surface is no longer between the contacts and has a very reliable cutting action, and combine this valve is suitable as a medium to cut off or adjust and cutting use.

     Once the cut-off valve is turned on, its seat and the valve between the valve sealing surface is no longer in contact, so it's a smaller sealing surface mechanical wear, as most of the cut-off valve seat and valve flap is easier to repair or replace When sealing element is not required to remove the entire valve from the pipeline to which the valve and pipeline welding for the occasion into one is very applicable. Medium through such valve when the flow direction changed, so a higher cut-off valve of the flow resistance in other valves.

     Commonly used cut-off valves are the following: 1) Angle type globe valve; in angle-type stop valve, the fluid simply by changing a direction, so that through this valve on the pressure drop than the conventional structure of small cut-off valve. 2) DC-type cut-off valve; in the DC-type or Y-shaped cut-off valve, the valve of the flow channel and mainstream Road into a slash, so that movement of the state extent of the damage is smaller than the conventional cut-off valve, so the pressure loss through the valve is also the corresponding smaller. 3) The plunger-type valve: This form of cut-off valve is a variant of conventional cut-off valve. In the valve, the valve flap and valve seats are usually based on the plunger principle of design. Polished into a flap valve stem is connected with the plunger, the plunger seal is on the two sets of flexible seals achieved. Two elastic rings separated by a ring, and through a valve cover nut the load exerted on the valve cover seals around the plunger pressure prison. Elastic ring can be replaced, you can use a variety of material, the valve is mainly used for "open" or "off", but with a special form of plunger or special rings can also be used to adjust flow. 

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How solar water heating systems with thermostatic mixing valve appropriate

Thermostatic mixing valve self-similar appearance a 4-pass valve, the valve port 3, a temperature control. 3 valve has two mouths are the hot and cold water inlet, and the other is the outlet temperature. Department in the outlet equipped with a thermal component, the use of thermal characteristics of components to promote mobile spool valve body, sealing or open cold water intake, cold water in the closure of the open water at the same time. When the temperature adjustment knob after setting a water temperature, regardless of the temperature of hot and cold water, pressure changes, into the outlet of the hot and cold water also changes the ratio, which has always been employed to maintain constant water temperature. At present, solar water heater manufacturers water heater most of the use of hot and cold water valve or switch Ischaemum mechanical troubled waters mixed water temperature regulation. Solar water heater due to temperature changes have a lot of hot water, hot and cold water pressure a lot to be repeated before each use regulation, when the bath water pressure, water temperature changes, the situation will have a cooler. Foreign imports of individual manufacturers mixing valve temperature, as a selection of matching products for users, because prices were too high, thus limiting its promotion.



Demand for the domestic market, Beijing Technology & Trade Center, the sun-ho-yu developed specifically for the use of solar water heaters for the 15mm diameter of the mixing valve, and its price is only 20% of foreign products, the performance characteristics and specifically the use of solar water heater and applied for a national patent. Here Kemao Beijing Hao Yu Sunshine Center production mixing valve water heater thermostat and use of experimental.



1, the water flow



Test: When the hot and cold water imports are pressure 0.1Mpa (1kg), the water is 0.98m3 / h (that is, more than 16L per minute) can theoretically lead three shower heads. Water pressure due to the sun may only 0.25kg ~ 0.3kg, to the water temperature constant, a mixing valve only with the best of a shower nozzle. If we can increase the water pressure, with more nozzles.



2, hot and cold water inlet pressure



Products to allow for hot and cold water pressure differential 8:1. Cold water pressure of not more than 2.5kg, the water pressure 0.3kg, can be normal troubled waters. Instability if the water pressure may be higher than 2.5 kilograms, it is necessary to install pipe in cold water limiting valve, such as "100 million to" water heaters are equipped with every machine limiting valve. If the valve can be installed manually resistance both as a switch using cold water as well as regulation of flow, pressure does not guarantee value.



3, security features - anti-scalding feature



Cold Intake with self-closing performance. When used on or off if the cold water, a few seconds, the water will automatically shut down to ensure that people will not burn. The time required for a few seconds, temperature is the temperature sensor element to the valve core mobile implementation of the time required to close the hot water, hot water temperature the higher the shorter closing time, if the water temperature above 80 ℃, 23 seconds as long as you can启锁. Water scald accidents are often caused by misoperation, solar water heater thermostat is equipped with the equivalent of mixing valve Anti-scald safety valve installed. Abroad, some countries (such as New Zealand) on the installation of solar water heaters require the installation of thermostatic mixing valve, in addition to easy-to-use, water conservation, and also to consider the safety factor.



4, automatically only to emissions and use of water in the cooling water pipe



Bath water temperature about 40 ℃, thermostatic mixing valve when the temperature is set, the whole hot and cold water inlet opening, according to the ratio of water to the outlet; stop using when the outlet closed, due to water pressure, water will possession of a certain amount of water lost, and the valve body temperature and the role of components because of cold water, cold water will gradually close the mouth and I opened the hot water, and the entire water system will be static. Taking into account the cold-water pressure, and the mixing valve outlet shut down by the pressure of hot and cold springs, rubber seal is the temperature, the seal may be leaking, if dissatisfied with the water tank can be automatically only when the Sheung Shui, and water tanks full, the cold water pipe installed on the closure of the valve is necessary. When re-bath, open the outlet switch, doors closed because of cold water, first of all, the hot water outflow pipe in the cooling water, when water under high temperature, a temperature components will move off the mouth of small hot water, cold water to open the mouth, automatically conditioning thermostat.



5, after a constant temperature mixing valve for adding water tanks



Thermostatic mixing valve temperature adjust button marked arrows point to 55 ℃ and 25 ℃, the direction of the representative of temperature, water temperature at the right feel, and stop spinning action is needed to set up your temperature. High-temperature direction at the end of the closure of cold water; low-temperature direction at the end of the closure of water. After testing, will be mixed in cold water valve to the closed state, if the water temperature exceeds 55 ℃, the water will automatically open the mouth; to the closure of water status. Cold water less than 5 ℃, the hot water I would not completely shut down.



Sheung Shui to achieve functional, it is necessary to make the outlet hot and cold at the same time open, and open the cold water switch. Adjustment knob from 25 ℃ ~ 55 ℃ regulation may be rotated beyond 720 ° (twice), two intake can be open at the same time does not exceed the rotation above 90 °, sometimes only 45 ° rotation, to find the rotation paragraph, the cold hot mouth wide open, you can reach the outlet, Sheung Shui, the purpose of the closure. At room temperature under normal conditions, the cold water temperature is normally 5 ℃ ~ 25 ℃ between, when the stop bath, the mixing valve body temperature that is the pressure of cold water temperature. Described in front, when the water temperature is set at 40 ℃, after the cold water bath to stop I will automatically shut down. If the direction to the low-temperature regulation, I will open the cold water.



Not identified in the circumstances, the direction of first low-temperature knob to the end of winter (assuming the water temperature 5 ℃ ~ 10 ℃), then back 45 °, (turning 1 / 4 circle), summer (assuming the water temperature of 20 ℃ ~ 25 ℃) callback 90 °, can be two intakes into the open at the same time, open the cold water valve to complete the Sheung Shui. In order to prevent overflow of water tanks, pipes should be installed in cold water to close the valve, water heater when not in use the closure of Sheung Shui pipeline.



Described above to be more practical to use the test, I hope more users and solar energy to explore engineering and technical personnel involved in research. I believe the near future, there will be more user-friendly type of solar water heater market fool, so that the energy-saving solar water heaters, water-saving, safe and convenient direction. 

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Solenoid valve products with performance on the four properties (b)

4.2 voltage specifications preferred to use as much as possible AC220V, DC24V.



4.3 supply voltage fluctuations in the exchange of choice is usually +10%, -15%, DC ±% 10 or so to allow, if ultra-poor, measures to be taken by regulators or special order requests.



4.4 power supply capacity should be based on choice of rated current and power consumption. Bearing in mind that start-up when the exchange value of the higher VA, in the capacity should be directed preferred solenoid valve indirectly.



5, the control accuracy



5.1 Only ordinary solenoid valve opened two customs location, in the control of high precision requirements and parameters at a steady number of solenoid valves; Z3CF three normally open solenoid valve, with Enlight, wide-open and closed three flow; ZDF -Z1 / 1 multi-function solenoid valve combination with wide-open, open, small open, wide-open four flow.



5.2 Movement Time: refers to signal or cut off access to the main valve action completion time, and only patented product of multi-function solenoid valve can be opened and closed, respectively, regulate the time, not only to meet the requirements of control precision, but also to prevent water hammer damage.



5.3 sample leakage leakage given the economic value of commonly used grade, if too high, please make a special order.



Third, the reliability of:



1, working life, this pilot project is not included in the factory, belonging to the type of pilot projects. In order to ensure the quality of the formal election of the brand manufacturers.



2, the working standard: sub-system of long-term, repeated short-term and short-term work of three working. Conventional products are long-term work system, that is, the work coil to allow long-term electricity. For a long time to close the valve to open only a short-term situation, it should be always selected solenoid valve. Used in short-term work system and a large bulk, they can make a special order to reduce power consumption.



3, operating frequency: high frequency movements, the structure should be preferred direct acting solenoid valve, preferred to listen to the exchange of power.



4, the reliability of strict action is not formally included in the pilot solenoid valve of our professional standards, in order to ensure the quality of the formal election of the brand manufacturers. Number of occasions, some not much action, but has very high reliability requirements, such as fire protection, emergency protection, must not be taken lightly. Of particular importance, should be taken once a double insurance 2.



Fourth, the economy of:



Funding is not the economy, energy and even a waste of life it is the yardstick of choice, but must be in terms of safety, applicable and reliable on the basis of the economy, the economy is not only a product of the price, but also to give priority to their functions and quality of and installation of maintenance and other accessories required for the cost, but more importantly, a solenoid valve-controlled system in the whole control system in the entire production line as well as cost-share little, if just for the sake of cheap and small damage caused by the wrong group of early elections is huge.



In short, the economy not just the price, but the cost of products, a comprehensive cost-effective prices. ball valve check valve butterfly valve
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Selection of globe valve guide

As the valve stem and valve seat sealing surface perpendicular to the axis. Valve stem to open or close the trip is relatively short, and has very reliable cutting action, makes this valve ideally suited as a medium and cutting off or regulate the use of. Cut-off valve when the valve flap in the open position, and its valve seat and valve sealing surface is no longer between the contacts and has a very reliable cutting action, and combine this valve is suitable as a medium to cut off or adjust and cutting use.

     Once the cut-off valve is turned on, its seat and the valve between the valve sealing surface is no longer in contact, so it's a smaller sealing surface mechanical wear, as most of the cut-off valve seat and valve flap is easier to repair or replace When sealing element is not required to remove the entire valve from the pipeline to which the valve and pipeline welding for the occasion into one is very applicable. Medium through such valve when the flow direction changed, so a higher cut-off valve of the flow resistance in other valves.

     Commonly used cut-off valves are the following: 1) Angle type globe valve; in angle-type stop valve, the fluid simply by changing a direction, so that through this valve on the pressure drop than the conventional structure of small cut-off valve. 2) DC-type cut-off valve; in the DC-type or Y-shaped cut-off valve, the valve of the flow channel and mainstream Road into a slash, so that movement of the state extent of the damage is smaller than the conventional cut-off valve, so the pressure loss through the valve is also the corresponding smaller. 3) The plunger-type valve: This form of cut-off valve is a variant of conventional cut-off valve. In the valve, the valve flap and valve seats are usually based on the plunger principle of design. Polished into a flap valve stem is connected with the plunger, the plunger seal is on the two sets of flexible seals achieved. Two elastic rings separated by a ring, and through a valve cover nut the load exerted on the valve cover seals around the plunger pressure prison. Elastic ring can be replaced, you can use a variety of material, the valve is mainly used for "open" or "off", but with a special form of plunger or special rings can also be used to adjust flow. 

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Oxygen valve works What is this?

In physical chemistry experiments, often use the oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in a dedicated high-pressure gas cylinders in the. When used through the valve so that gas pressure down to test the required range, and then fine-tuning through the other control valves, so that gas entered the system. The most commonly used valve for the oxygen valve, referred to as oxygen table.



1. Oxygen valve works



Oxygen valve look and work.



The high-pressure oxygen chamber and the cylinder valve connected to low-pressure chamber for gas exports and access to use the system. Table showing the value of high-pressure storage of gas cylinder pressure. Low table outlet pressure adjustment screw can be controlled.



When you first open the cylinder using the master switch, and then the table clockwise rotating low pressure regulator screw to compress the main spring and the transmission film, spring pads, and push-rod and open the trap door. This high-pressure gas imports from the high-pressure chamber through the throttle after decompression into the low-pressure chamber, and the exit leading to the working system. Turn adjustment screw to change the valve opening height, thus regulating the passage of high-pressure gases to achieve the required amount of pressure value.



Valves are equipped with safety valve. It is to protect the valve and make the safe use of the device, is also a valve failure signal device. If, living doormat, valve damage, or due to other reasons, resulting in increased outlet pressure, and exceeds a certain permission on their own value, the valve will automatically open the exhaust.



2. Oxygen valve to use



(1) according to the different application requirements, oxygen valve has many specifications. The maximum inlet pressure the most part, the minimum inlet pressure of not less than 2.5 times the outlet pressure. Outlet pressure specification more, generally, the maximum outlet pressure of.



(2) The installation of pressure reducing valve should be connected to determine whether the cylinder and the use of standard connector systems are consistent. Valve and the cylinder with hemispherical connections, tighten nut to rely on the two fit together well. Therefore, the use of the two hemispheres should be to maintain the smooth surface in order to ensure good gas-tight effect. Before installation can be high-pressure gas blowing addition to dust. When necessary, can also be used to make Teflon and other materials, gasket.



(3) The oxygen valve should be forbidden contact with grease, so as to avoid fire accidents.



(4) stop working when the valve should be placed in a net residual gas, and then loosen the adjustment screw so as to avoid long-term compressive deformation of elastic components.



(5) The valve should be avoided shock vibration, can not be in contact with corrosive substances.



3. Other wear-resistant electrode gas valve



Some gases, such as nitrogen, air, argon gas and other permanent gases, oxygen valve can be used. But there are a number of gases such as ammonia and other corrosive gases, you need special valve. Common market are nitrogen, air, hydrogen, ammonia, acetylene, propane, water vapor and other special valves.



The use of these valve methods and precautions with the oxygen valve basically the same. However, it should be noted: Private valve is generally not used for other gases. In order to prevent misuse, and some special valves and the cylinder using a special connection between the mouth. For example, hydrogen and propane are used thread left teeth, also known as reverse-threaded, the installation should be special attention. 

 

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