How to eliminate and prevent vacuum ball valve and vacuum butterfly valve failure

How to eliminate and prevent vacuum ball valve and vacuum butterfly valve failure?

Ball valve common fault causes and prevention methods: the door is not strict, the ball overturning assembly should be correct, the operation should be stable, not allowed to be used as a throttle valve; the ball should be repaired in time after flushing, replace the seal seat for throttling, damage The sealing surface is not allowed to be throttled. The sealing surface is crushed. The bolt should be even and the force should be small. It is better to tighten it several times. Do not tighten too much too tightly at one time. The damaged sealing surface can be repaired and sealed. The pre-tightening pressure should be checked regularly on the sealing surface of the valve seat without pre-tightening pressure. If the sealing surface is leaky or the contact is too loose, the sealing surface of the valve seat should be pressed slightly;

If the preloading spring fails, the gap between the wrench, the stem and the ball should be changed. The gap between the wrench and the ball is large, the wrench has reached the closing position, and the ball rotation angle is less than 90°. The connection between the wrench, the stem and the ball that causes the leakage limit mechanism is loose. When the clearance is too large, it should be repaired and tightened;

Adjust the limit block to eliminate the advance angle of the wrench, so that the ball is properly opened and closed. The contact surface between the valve seat and the body is not smooth and worn. The 0-ring damage causes the valve seat leakage to improve the contact surface smoothness of the valve seat and the body, reducing the number of valve seat disassembly. O-rings are regularly replaced and common faults are prevented and eliminated.

Sealing surface leakage (for shutting off valve) Rubber sealing ring aging, wear rubber sealing surface regular replacement sealing surface pressure ring loose, broken when the broken pressure ring should be retightened, damage and corrosion should be replaced, the medium flow direction should not be replaced according to the medium flow direction arrow installation The connection between the valve stem and the butterfly plate of the butterfly valve is loose, so that the valve is not closed, the butterfly valve is removed, and the transmission device and the valve stem at the connection between the valve stem and the butterfly plate are repaired, so that the sealing surface is not tightly repaired, and the damage should be replaced seriously.