Reduced pressure pneumatic valve troubleshooting

Reduced pressure pneumatic valve is a kind of outlet pressure adjustment to below the pressure control of pneumatic valve inlet pressure. Speaking of reduced pressure pneumatic valve failure, there are several kinds of common problem, then aiming at the several ways, how to eliminate?






failure phenomenon: unstable pressure fluctuation



failure analysis: 1, the oil mixed with air.


2, damping hole plugging sometimes.


3, pneumatic valve and valve body hole roundness in excess of that specified, pneumatic valve is stuck.


4, spring deformation or stuck in the slide pneumatic valve, make the pneumatic valve move difficult or spring is too soft.


5, out of round steel, steel or bad cooperation with pneumatic seat cone pneumatic valve installation is not correct.



elimination method: 1, remove oil in the air.


2, clean the damping hole.


3, practice of pneumatic valve hole and pneumatic valve.


4, replace the spring.


5, replace the steel or open cone pneumatic valve adjustment.





failure phenomenon: the secondary high pressure rise not


failure analysis: 1, outside leakage.


2, pneumatic valve cone poor contact with the pneumatic valve seat.


elimination method: 1, replacement of seals, fastening screws, and ensure the moment of force.


2, repair or replacement.





failure phenomenon: can't afford to reduce pressure


failure analysis: 1, drainage mouth can't; Drain pipe connected to the return pipe and oil pressure.


2, the main pneumatic valve core card in the full open position.


elimination method: 1, the drain pipe must be separated from oil return pipe, a separate back into the tank.


2, repair and replacement parts, check the oil.