Ball valve common failure reasons for the prevention and elimination method closed lax ball impact assembly should correctly, smooth operation, does not allow for the use of throttle Industrial Valves; Sphere should be timely after rushed over to repair, replace seal used for throttling and damage the sealing surface does not allow for throttling seal face being tight seating bolts should be uniform, force is smaller, the better to close a few times more, not a tight too much too tight, damage the sealing surface of crapping to repair the seal face can be performed without preload pressure valve seat sealing surface should be regularly check preloaded, found a leak or sealing surface contact should be a little loose pressure valve seat sealing surface; Lost effect prepressing spring replacement wrench, and the stem and ball joint gap is big, the wrench has to close down, from leakage and sphere rotation Angle less than 90 ° limited institutional wrench, the stem and ball joint looseness and large clearance should be repair, fastening tightly; Adjust spacing block, eliminate wrench advance Angle, make the ball right open and close the seat and ontology interface is not bright and clean, wear and tear, 0 ring damage make seat leakage increase seat and ontology surface bright and clean degree, decrease The Times of the seat remove o-ring replaced periodically common failure reasons for the prevention and elimination method leak sealing surface ( For cut off valve) Rubber sealing ring aging, wear rubber sealing surface replaced periodically clamping ring loose, broken pressure ring sealing surface should be to tighten loose, damage and corrosion seriously don't correspond to the flow direction of medium should be replaced by the medium flow arrow installed butterfly valve stem and disc joint loose valve closed lax butterfly valve, repair the valve stem and disc joint actuator and the valve stem damage, make the sealing surface closes lax repair, badly damaged should be replaced
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