Pneumatic ball valve leakage is introduced

the construction cause of pneumatic valve leakage:
1) pneumatic valve's overall damage caused by improper transportation and hoisting resulting in leakage in pneumatic valves;
2. When leaving the factory, after the water pressure not to dry processing and anticorrosive processing, pneumatic valve sealing surface caused by rust formation of leakage;
(3) the construction site protection does not reach the designated position, not with blind flange on both ends of the pneumatic valve, water, sand and other impurities into the pneumatic valve seat, cause leakage;
4. When installation, not to inject grease pneumatic valve seat, caused by impurities into the pneumatic seat back, or burn when welding the cause of leakage;
5) pneumatic valve in the fully open position for installation, sphere damage, when welding, if the pneumatic valve is not in the fully open position, the welding spatter material will cause damage to sphere, when accompanied by welding spatter the sphere in the switch of content further pneumatic seat damage, resulting in leakage;
6 pieces construction such as welding slag sealing surface scratch;
7) delivery time limit or install a leakage caused by inaccurate, if pneumatic valve stem drive units or other accessories with the assembly of angular misalignment, pneumatic valve to leak.
the run-time causes of pneumatic valve leakage:
(1) the most common reason is operating managers to consider more expensive maintenance of pneumatic valve is not maintained, or the lack of scientific management and maintenance method of pneumatic pneumatic valve valve no preventive maintenance, equipment malfunction in advance;
2. Improper operation or not in accordance with the maintenance program for 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 pneumatic valve, pneumatic valve seat and the ball lock, when the switch of pneumatic valve seal damage form of leakage;
6 pneumatic valve leakage switch does not reach the designated position, no matter any pneumatic ball valve open and close, generally tilt ° ~ ° it may cause leakage [ ] ；
7) many large diameter ball pneumatic valve with pneumatic valve stem mostly stop block, if you use a long time, due to reasons such as corrosion in pneumatic valve stem and pneumatic valve stem between stop blocks will accumulate rust, dirt, paint and other sundry, the clutter pneumatic valve cannot be rotated due to leak - — If pneumatic valve is buried, lengthen the pneumatic valve stem yield and falling more rust and impurities hinder pneumatic valve ball spin in place, causing pneumatic valve leakage,
was generally of 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 pneumatic 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 elastic pneumatic valve seat, hinder the pneumatic seat movement, cause the seal failure.