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How to prevent and eliminate ball valve and butterfly valve failure

Update:14-05-2019
Summary:

Used as a throttle valve; the ball should be repaired i […]

Used as a throttle valve; the ball should be repaired in time after flushing, and the seal seat should be replaced.

Used for throttling, damage to the sealing surface: not allowed for throttling

The sealing surface is crushed: the bolts at the valve seat 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 by grinding.

There is no pre-tightening pressure on the sealing surface: the sealing surface of the valve seat should be checked regularly for the 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 a little; the pre-compression spring should be replaced.

The gap between the wrench, the stem and the ball is large, the wrench has reached the closed position, and the ball rotation angle is less than 90°, causing leakage: when the connection between the wrench, the stem and the ball of the limited position mechanism is loose and the clearance is too large Should be repaired, tightened firmly; adjust the limit block, 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, and the 0-ring damage causes the valve seat to leak: improve the contact surface smoothness of the valve seat and the body, reduce the number of valve seat disassembly, and replace the O-ring regularly.

Rubber seal aging, wear: rubber seal surface is replaced regularly

The sealing surface pressure ring is loose and damaged: when the pressure ring is loose, it should be retightened, and the damage and corrosion should be replaced.

The flow direction of the medium is wrong: the butterfly valve should be installed according to the flow direction arrow

Loosen the connection between the valve stem and the disc to make the valve not tight: remove the butterfly valve and repair the connection between the valve stem and the disc

Damage to the transmission and stem, so that the sealing surface is not tight: repair, severe damage should be replaced

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