Regulating valve in use process, because the actual valve position deviates from the given valve position of leak, cause the servo amplifier inflatable repeatedly, the valve can not be stable in a given valve position, cause valve vibration, what should meet actuators leak situation inspection and handling? Next to look at,
1 a flat area
(1) pneumatic diaphragm actuator pneumatic diaphragm actuator diaphragm damaged, push-rod spring tray and loose, broken o-ring, reaction between push rod and cover film under actuator seal leakage, usually a v-shaped sealing ring wear, roof mounted handwheel body membrane cover seal leakage,
(2) straight travel straight cylinder actuator stroke cylinder actuators (including for fork type quarter-turn actuators) piston seal leakage (cylinder gas leakage), piston cylinder head seal leak, the limit screw leak sealing components, output shaft seal leakage between cylinder head,
(3) dual rack structure quarter-turn actuators dual rack structure Angle of travel on the back of the actuator piston seal leakage, cylinder head and cylinder seal leak, the output shaft connected to the cylinder block and support seal leak, the limit on the cylinder head screw air leakage,
(4) external attachments external accessories such as various joint locator output pipeline leak, pneumatic speeder or relay, quick exhaust valve, a one-way speed governor and a valve leakage,
2 air leakage treatment for different air leakage phenomenon, different processing methods,
(1) if the switching time of the valve without strict restrictions, should as far as possible to reduce joint pneumatic attachment and process, such as cancellation of quick exhaust valve, pneumatic speeder, one-way speed governor, variable diameter and bending, ancillary components such as
(2) cleaning and infuse lubricating oil regularly, keep the push rod, clean the valve stem rust, chromium plating layer is not peeling, lubrication, fully ensure the seal is not wear, do not leak,
(3) inspection, the vent of pneumatic diaphragm actuator (positive vent in the membrane cover, adverse effect on the membrane cover) and single-acting piston cylinder vent parts such as leak detection, found a flat in a timely manner to repair processing,
Above is the control valve actuator air treatment, gas leakage will cause the regulator to vibration, affect the normal work, usually check oh, it is important to note that use this here, welcome attention ah,