What electrode is generally used in the circuit diagram of the pneumatic vertical butterfly valve control box? Everyone must have experienced the leakage of pneumatic butterfly valve, so how to solve the leakage during the use of pneumatic butterfly valve! Now let's follow Shanghai Yoxi Flow to see some solutions to the leakage of pneumatic butterfly valve. First, the method of adding sealing grease is mainly for the valve body with unused sealing grease. Adding sealing grease can improve the sealing performance of the valve stem. Adding sealing grease during maintenance is also one of the maintenance procedures. Second: Change the flow direction to set P2. When the valve rod end method △ P is larger and P1 is larger, it is obviously more difficult to seal P1 than to seal P2. Therefore, the method of changing the flow direction can be adopted to change P1 at the valve rod end to P2 at the valve rod end, which is more effective for valves with high pressure and large differential pressure. Third: Lens gasket sealing method is used for the sealing of upper and lower covers, and the sealing of valve seat and upper and lower valve bodies. If the plane seal is poor in sealing under high temperature and pressure, resulting in leakage, lens gasket sealing can be used instead, and satisfactory results can be obtained. Fourth: The method of increasing packing is usually to simply increase the number of sealing gaskets in the form of double-layer or multi-layer mixed packing. For example, increase 3 pieces to 5 pieces to improve the sealing performance of the valve stem, but the effect is not very obvious. The fifth kind: the tetrafluoro packing widely used by the replacement of graphite packing method, its applicable working temperature is in the range of - 20 - 200 ℃. When the working temperature changes greatly at the upper and lower limits, its sealing performance will decline significantly, and its aging is fast and its service life is short. Many factories have replaced the PTFE packing with graphite packing, and even the newly purchased pneumatic butterfly valve has replaced the PTFE packing with graphite packing for use. However, graphite packing also has a disadvantage, that is, large return difference, so these should be considered when designing and installing valve body equipment.
、 This new valve has good flow medium control characteristics. When the pneumatic butterfly valve is fully opened, the thickness of the butterfly panel will become the only barrier force when the flow medium passes through the valve body. Therefore, the pressure drop generated by the valve is very small, which makes it have better flow control characteristics. The valve has good tightness and elasticity, The closed parts can be directly embedded on the valve body or beside the butterfly plate of the valve.
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