Safety of pneumatic valve structure types and classification

safety classification
pneumatic valve pneumatic valve structure mainly include two categories: spring type and lever type. With pneumatic spring type refers to the pneumatic valve seat valve sealing force by the spring. Leveraged by the reaction between the lever and weight. With the needs of large capacity, and there is a kind of impulse type safety pneumatic valve, pneumatic valve, also known as the guide type safety by the main security of pneumatic valve and auxiliary pneumatic valve. When the pipeline within the medium pressure in excess of the prescribed pressure value, the auxiliary pneumatic valve to open, medium along the catheter into the main security pneumatic valve, pneumatic valve and the main security opened, reduce the medium pressure increased.
security pneumatic valve pneumatic seat diameter and air emissions depends on the opening of the disc height, also can be divided into two kinds: tiny qi type open height is pneumatic valve seat diameter ( /) ~ ( /) , the rev is ( /) ~ ( /) 。
in addition, as the requirement of use is different, have closed and not closed. Enclosed the discharge medium is not leaked out, and all along the outlet, commonly used in toxic and corrosive medium. Enclosed is commonly used in non-toxic or non-corrosive medium.


according to the structure points according to its overall structure and the different loading mechanism can be divided into heavy hammer lever, spring type and pulse type 3 kinds.
。 Heavy hammer pneumatic valve lever type safety
heavy hammer pneumatic valve lever type safety is the use of heavy hammer and leveraged to balance the forces acting on the pneumatic valve. According to the principle of leverage, it can use the heavy hammer through leverage with the increase of quality of the smaller force become larger, and by moving the position of the heavy hammer ( Or transform the quality of the heavy hammer to adjust security pneumatic valve opening pressure.
heavy hammer lever type pneumatic valve has simple structure, safety and adjustment easily and accurately, and the load by pneumatic have larger increase with the rising of the disc, is suitable for high temperature occasion, used more widely, especially in the boiler temperature and high pressure vessel. But heavy hammer lever type safety pneumatic valve structure is bulky, easy loading mechanism vibration, and often the leakage due to vibration; The back pressure is low, is not easy to shut down and keep tight after opening.
。 Spring safety mini rev type pneumatic micro rev.
spring type safety valve pneumatic valve is the use of compression spring force to balance the forces acting on the pneumatic valve. Spiral cast the amount of compression spring can be rev. By rotating it
the spring type safety pneumatic valve adjusting nut to adjust, take advantage of this structure can according to need correction pneumatic valve open ( Pressure setting. Spring safety mini rev type portable pneumatic valve structure is compact, has a high sensitivity, the installation position is not restricted, and because of the sensitivity of the vibration is small, so it can be used for the transportable pressure vessel. This kind of security for the disadvantage of pneumatic valve is load will change with the pneumatic valve open, namely with the increase of pneumatic valve, spring compression ratio increases, forces acting on the pneumatic valve starts to increase. Pneumatic valve quickly open the safety is bad. In addition, the spring on the pneumatic valve will be because of the effect of long-term exposure to high temperature and reduce tension. Used in the container of high temperature, often want to consider the heat insulation or heat dissipation problem of spring, so that the structure is complicated.
。 Impulse type safety
the pulse pneumatic valve type pneumatic valve consists of the main pneumatic valve and the auxiliary pneumatic valve, through the role of the pulse pneumatic valve auxiliary driving action, its structure is complex, pneumatic valve (usually only applicable for large volumes of boiler and pressure vessel safety.
the three forms of security in the pneumatic valve, use more common is spring loaded safety pneumatic valve.

press media points according to the different way of discharge medium, safe, pneumatic valve and can be divided into totally enclosed and semi-enclosed and open three.
。 Pneumatic valve closed safety
totally enclosed security pneumatic valve exhaust gas all through the exhaust emissions, medium can't between external leakage, it is mainly used for medium is toxic. Containers of flammable gas.
。 Semi-enclosed safety pneumatic valve
semi-enclosed safety pneumatic valve discharge part of gas through the exhaust pipe, there is also a part from the air valve cover and pneumatic leak if the hole of the gap between the valve stem, gases used for medium to not pollute the environment more containers.
。 Pneumatic valve open security
open security pneumatic valve pneumatic valve cover is open, make the spring chamber and atmosphere are interlinked, it is beneficial to lower the temperature of the spring, mainly is suitable for the medium for steam, and the atmosphere of high temperature gas containers that don't pollute.

by pneumatic disc opens cent according to pneumatic disc opens the maximum height of pneumatic valve port diameter ratios and security, security can be divided into the spring raise closed high-pressure pneumatic valve type pneumatic valve and spring and all safety pneumatic valve two kinds.
。 Spring safety mini rev closed high-pressure pneumatic valve
tiny qi type safety of the pneumatic valve open height less than/the diameter of the flow channel, usually for runner diameter/a /. Safety mini rev type pneumatic valve movement process is proportional action, it is mainly used for liquid occasions, sometimes also used in the gas situation of emissions is small.
。 Spring all rev type pneumatic valve safety
the rev pneumatic valve type safety/the diameter of the opening height is greater than or equal to the port. All rev type pneumatic safety valve discharge area is pneumatic valve seat throat minimum cross-sectional area. Its action process is to belong to two acting, must use a lifting mechanism to achieve full open, full and pneumatic valve is mainly used in gas medium type safety.
。 Rev type safety of pneumatic valve
open height between micro and type with qi type. Made two paragraphs, which can be also used as the proportional action type.

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