1, check the solenoid valve is normal, the coil is worn or poor contact, solenoid valve spool stuck by something. Maintenance methods: replace the coil? Clean up the solenoid valve stuck things? The above method is useless to replace the solenoid valve. 2, unilateral pneumatic test pneumatic actuator? Check whether the normal work? Such as cylinder piston blow-gas, cylinder and end cap or shaft leakage and so on. Maintenance method: Disassemble the actuator to check whether the seal is damaged or not. The surface of cylinder bore is damaged. Replace damaged seal, replace piston, or cylinder. 3, check whether there is something inside the valve core or valve plate stuck. Maintenance methods: clean up impurities or replacement of damaged valve. 4, check the manual operation of the actuator handle is in manual position. Maintenance: Pull the handle to the pneumatic automatic position. 5, check whether the pipe is twisted, flattened. Repair methods: correct or replace the pipeline. 6, check the media or the ambient temperature is too low, causing the pipeline to freeze. Maintenance methods; immediate removal of condensate, additional water removal equipment.
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