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4. Operation
4.1 Inspections before Operation
①
Check whether there is any leak from all connections including the air pipe connections.
②
To check whether there is any leak from gland packing and gaskets, apply a pressure to the pipeline. If
any leak is detected, remove pressure from the pipeline and fasten the gland flange nut.
③
Check the bolts and nuts of the actuator and the yoke for any looseness.
④
Check whether there is any short circuit in the electric signal system.
⑤
Check whether the attached manual hand wheel is at the Neutral position.
⑥
Check whether the system operates accurately and flexibly according to the signals from the controller.
⑦
When raising the temperature or pressure, do it slowly. Never raise the temperature or pressure quickly.
⑧
Check whether the air pressure required for valve operation is accurately set. (Cylinder Actuator:
5.0kgf/cm
2
-> Specified in the name plate)
⑨
Electrical devices such as limit switch or solenoid valve are attached to an control valve. Even if the
manufacturer has adjusted them, the tubing may be bent or the valve stem’s position becomes incorrect
due to a shock during transportation or careless handling during assembly. Therefore, it is
recommended to readjust the valve during the test run.
- WARNING -
①
Remove air pressure from the actuator before using the manual hand wheel.
If you use the
hand wheel without removing air pressure, it may not work normally and its weak part may
get damaged by overstrain.
②
If the manual hand wheel is not at the Neutral position during control operation, it may not
work normally and its weak part may get damaged.
③
If you use a pressure higher than the specified pressure on the name plate, the rubber and
O-rings of the actuator may be damaged and cause operation problems.