Special troubleshooting of pneumatic actuators

pneumatic actuators occupies very important position in the field of industrial production. Pneumatic actuators are mostly to operate in harsh environments, such as high temperature, high pressure, strong corrosive environment, etc. This makes the pneumatic actuator failure probability or has a certain increase. Common fault with body movement, not the valve fails to close to zero, pneumatic actuators without feedback signal, the signal pressure is not stable, etc. There are some kind of special fault, such as vibration control valve of pneumatic actuator. Next, we mainly analyze the cause of special fault control valve vibration and treatment measures. Pneumatic actuator control valve vibration will cause the control system can not work normally, the vibration reason mainly has the following: and the vibration sources, namely the equipment pipeline itself has vibration. The selection of control valves, pneumatic actuators is not accord with the requirement of type selection, such as flow characteristic is not suitable for poor, valve diameter is larger, spring stiffness and so on, caused by vibration control valve. And erosion by fluid produced by vibration. Treatment: if found to be equipment pipeline itself some vibration, to clean the equipment pipeline to readjust, the vibration disappeared. If the control valve of pneumatic actuator itself, current limiting orifice plate can be used to absorb part of the pressure drop, slows the throttle, overcome valve vibration, and current limit orifice can also change the system intrinsic frequency, natural frequency to avoid the inherent frequency and control valve system and vibration generation.