Ball valve leakage reason 1) Causes of leakage in the valve during the construction: (1) transportation and overall damage caused by improper lifting the valve leakage inside the valve; (2) the factory, after the water pressure not to dry processing and anti-corrosion treatment of the valve, sealing surface rust formation of leakage; (3) the construction site protection does not reach the designated position, not with blind flange on both ends of the Industrial Valves, water, sand and other impurities into the seat, cause leakage; 4. When installation, no inject grease on the seat, caused by impurities into the seat back, or burn when welding the cause of leakage; (5) valve in the fully open position for installation, sphere damage, when welding, if the valve is not in the fully open position, welding spatter material will cause damage sphere, when accompanied by welding spatter material sphere when the switch will cause the seat further damage, resulting in leakage; 6 pieces construction such as welding slag sealing surface scratch; All landowners factory or inaccurate cause leakage, installation time if stem drive units or other attachment assembly angular misalignment, the valve will leak. 2) Run-time causes of leakage in the valve: (1) the most common reason is operating managers to consider more expensive maintenance to maintain the valve is not or lack of scientific management and maintenance to the preventive maintenance of valve is not caused by equipment failure in advance; (2) improper operation or not carried out in accordance with the maintenance program maintenance cause of leakage; (3) in normal operation, construction relic scratch sealing surface, the cause of leakage; (4) improper pigging sealing surface damage cause of leakage; (5) long-term maintenance, or activity, resulting in the seat and ball lock, when the switch valve seal damage form of leakage; 6. Cause of leakage Industrial Valves switch does not reach the designated position, no matter any ball valve open and close, generally tilt 2 & deg; ~ 3度; It may cause leakage; 7 many large diameter ball valves have stem mostly stop block, if you use a long time, due to reasons such as corrosion in the stem and stem between stop blocks will accumulate rust, dirt, paint and other sundry, these stuff will leak valve cannot be rotated due & ndash; — If the valve is buried, elongated stem yield and falling more rust and impurities block valve ball spinning in place, cause valve leakage, was generally actuator is limited, if long-term rust, grease hardening or limit bolt looseness will make limit is inaccurate and cause of leakage; Pet-name ruby electric actuator valve position setting, not the cause of leakage in place; and Attending a lack of regular maintenance and maintenance, sealing grease dry and harden, dry sealing grease accumulation after the resilient seated, hinder the seat movement, cause the seal failure. Gas ball valve leakage judgment method is commonly used in the gas pipeline ball valve fixed axis, its general check method is: will turn the valve to open or close, through the body drain mouth emissions check for leaks. If you can clean, you prove good seal. If there is always pressure discharge, it can be thought of as the valve leakage, then the corresponding processing to the valve. Gas ball valve leakage within the handler (1) the first check valve limit, whether by adjusting the spacing can solve the leakage of the valve. (2) by injecting a certain amount of grease to see whether could stop leakage, injection speed must be slow at this moment, at the same time observe the change in the grease gun export pressure gauge pointer to the internal leakage of the valve. (3) if you can't stop leakage, it is possible that early sealing grease injection harden or sealing surface damage cause of leakage. Advice when cleaning fluid injection valve, the valve sealing surface and the seat for cleaning. Generally at least for half an hour, if necessary can soak for a few hours or even days, dissolve to be cured and then take the next step. In this process a few times can be the best Industrial Valves switch activity. (4) to inject grease, intermittent open and close the valve, the impurity cavity and sealing surface after discharge valve seat. (5) in a fitted for inspection, if there is still a leak, sealing grease injection should be strengthen level, at the same time open the vent valve cavity, so that we can produce the large pressure difference, helps to seal, under normal circumstances, the level by injecting strengthen internal leakage sealing grease can be eliminated. 6. If there is still leakage, the valve for repair or replacement.
Collectively, the effect of wedge valve on industrial society has been to eliminate resilient gate valve and drastically reduce the time long associated with resilient valve.
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There are ample scientific evidence of reducing the risk of resilient seated valve.
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