Electro-hydraulic servo pneumatic valve failure caused by dysfunctional

oil motive refusing action
in the unit before the pneumatic valve drive test, sometimes, the phenomenon of the individual oil motive motionless, on the premise of out of control signal failure, caused the above phenomenon is the main reason of the electro-hydraulic servo pneumatic valve jamming. In spite of the unit prior to the start of the oil circulation and oily assay also qualified, but due to the system position of every point can't completely circulation flushing, so some particles may be in servo pneumatic servo valve action in the process of jamming the pneumatic valve.
valve snaps
in the unit operation process, sometimes on the basis of the control instruction, the valve fully open or close, suddenly caused the above phenomenon is the main reason of the electro-hydraulic servo pneumatic valve plug. Mainly in the oil dirt clogging nozzle flapper servo pneumatic valve, a servo pneumatic valve caused by sudden moves in one direction, motivation lead to oil moving in one direction to the limit position, the valve is out of control.

valve valve swing swing is one of the more common fault phenomena, on the premise of out of control signal failure, servo pneumatic valve working instability is the main reason. Servo pneumatic valve leakage is large, the resolution and zero is not stable, are likely to cause the motion of the electrically controlled system. Increase the resolution of the servo pneumatic valve, make the servo control system of pneumatic valve can not quickly response instructions, easy to cause the overshoot of system, result in system within a certain range adjustment, cause valve swing. Pneumatic valve pneumatic servo valve wear, not only cause the servo pneumatic valve leakage increase, and will cause the servo pneumatic valve zero is not stable, long term servo pneumatic valve is in a state of adjustment, serious can cause valve swing. High oil motive delay rate

some of the reasons for this phenomenon, low flow gain of servo pneumatic valve, pressure gain low servo pneumatic valve and servo pneumatic valve filter blockage resolution is too large, etc. , are likely to increase oil motive delay rate. Solution is to strictly control the resistance to fuel oil, regular inspection servo pneumatic valve.
oil dynamic authority does not reach the designated position
in the mechanical parts of the control signal and the premise of no problem, the main cause of oil dynamic authority does not reach the designated position for servo pneumatic valve in the right zero bias.