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Pneumatic valve actuator inspection and verification
1, check the tightness of the thin film gas chamber When the regulator valve nameplate signal pressure range of 0.2 ~ 1kg / cm2 (the same below), 0.8kg / cm2 pressure of compressed air into the thin film gas chamber, cut off the gas source for 5 minutes , Thin film gas chamber pressure drop should not exceed 0.007kg / cm2 (5mmHg). 2, putter action and stroke inspection â‘ with 0 ~ 1kg / cm2 range of signal pressure input thin film gas chamber, reciprocating increase and decrease signal pressure, push rod should move evenly and without jamming beating phenomenon. â‘¡ adjust the compression spring pre-pressure, the signal pressure is 0.15kg / cm2 push rod start (start with the unit combination instrument with signal pressure 0.2kg / cm2). â‘¢ to 0.2 ~ 1.0kg / cm2 pressure range to increase and reduce the signal pressure, putter stroke should meet the maximum travel regulator requirements. 3, the assembly of the inspection (1) control valve assembly should be checked before the valve seat, valve stem with or without defects. After grinding the valve seat and valve contact should be tight, stem should be straight and smooth. (2) After the regulator and actuator are assembled, input the signal pressure to close the regulator valve to the membrane chamber, and adjust the length of the valve stem so that the valve plug and valve seat are in close contact with each other. The pressure signal is 0.95kg / cm2 for the air-off valve and 1.0kg / cm2 for the unit combination meter, and zero for the air-open valve input signal. Pneumatic membrane valve is the process of production process automatically adjust the system is extremely important part. In order to ensure its safe and normal operation, the installation and use or maintenance should be based on the actual needs of the necessary inspection and calibration.