What reason can affect the intelligent pneumatic valve electric actuator is good or bad

the working performance of the intelligent pneumatic valve electric actuator is good or bad will directly affect the quality of the whole control system work. Because intelligent pneumatic valve electric actuator is at the scene of direct contact with the modulated medium, work environment is very bad, so easy to produce all kinds of faults. In the process of production, in addition to eliminate these problems at any time, also must carry out regular maintenance and preventive maintenance. Especially for use at bad environment regulating pneumatic valve, more should pay attention to maintenance and preventive maintenance.
so intelligent pneumatic valve electric actuator when used in installation should pay attention to the following aspects:
. The daily maintenance of pneumatic control valve:
when regulating pneumatic valve adopts graphite - Asbestos packing, about three months should be on the packing to add a lubricating oil, to ensure the regulating pneumatic valve is flexible to use. If found that packing pressure cap pressure very low, should complement packing, ptfe packing hardening is found, should change in time; Should pay attention to regulate the operation of the pneumatic valve in the circuit check, check the pneumatic valve position indicator and it fits the regulator output; To adjust the pneumatic valve positioner often should check the gas source, found that the problem handled in time; Should maintain frequent health and adjust the pneumatic valve parts complete works.
. Intelligent pneumatic valve electric actuator common faults and causes:
( ） Adjust the pneumatic valve is not action. Fault phenomenon and the reasons are as follows:
a. No signal, no gas source: (1) gas source is not open. (2) due to the air source water freezes in winter, cause the clogging in duct blockage or filter, vacuum pneumatic valve failure. (3) to a bad compressor. (4) air duct leakage.
b. Have gas source, no signal: (1) regulator failure. (2) signal pipe leaks. (3) locator corrugated pipe leakage. (4) adjust the retinal damage.
c. Locator without air source: (1) filter clogging. (2) the reduced pressure pneumatic valve failure. (3) pipe leakage or jam.
d. Locator is air, not output: locator orifice clogging.
e. Signal, no action: (1) pneumatic valve core loss, (2) pneumatic valve core is stuck with the pneumatic valve seat. (3) pneumatic valve rod bent or broken. (4) pneumatic seat pneumatic valve core to freeze or focal piece of dirt. (5) intelligent pneumatic valve electric actuator spring rust due to long time.
（ ） Adjust the action of pneumatic valve is not stable, fault phenomenon and the reasons are as follows:
a. Air pressure is not stable: (1) compressor capacity is too small. (2) the reduced pressure pneumatic valve failure.
b. Signal pressure instability: (1) the control system of time constant ( T=RC） Is not appropriate. (2) the controller output is not stable.
c. Stable air pressure, pressure is stable signal, but adjust the pneumatic valve action is still unstable: (1) the locator amplifier in the pneumatic ball valve by dirt and wear closed lax, special gas consumption increase would produce output volatility. (2) locator nozzle baffle amplifier of parallel, shutter nozzle. (3) the output pipe, line leak. (4) actuators rigidity is too small. (5) intelligent pneumatic valve electric actuator frictional resistance is big, and the contact area with blocking phenomenon.