What are the maintenance methods for automatic control valves?

The maintenance methods of automatic control valves mainly include the following aspects:

1. Maintenance of gas source and gas circuit
Drainage and cleaning: Press the drainage button of the filter pressure reducing valve every month to drain the water in the cup and clean the filter of the filter pressure reducing valve.
Check the gas source pipeline: Check whether the joint of the control gas source pipeline is loose and whether the raw tape of the threaded part of the joint is aging. If there is looseness or leakage, it should be handled in time.
2. Maintenance of power supply and electrical control
Check the circuit: Check whether the power circuit and electrical control circuit are bitten by mice, damaged by external force or overloaded and burned by joints every month. If there is, they should be replaced in time.
Check the waterproof seal: Check whether the waterproof seal of the electrical control circuit access port is intact and whether water or process medium enters. If there is, it should be cleaned or replaced in time.
3. Maintenance of positioner (intelligent controller)
Check the mounting nut: Check whether the mounting nut of the positioner is loose every month. If there is, check whether the positioner is displaced or the feedback rod is worn out. If necessary, contact the manufacturer for processing.
Cleaning the nozzle: For mechanical positioners, check whether there is any obstruction or debris at the nozzle. If there is, use special tools to clean it.
Self-tuning: For intelligent positioners, self-tuning should be performed once a month according to the manufacturer's instructions.
4. Lubrication and cleaning
Lubrication: Apply an appropriate amount of lubricating oil to the parts that need lubrication (such as valve stems and transmission mechanisms) regularly to reduce wear and maintain smooth movement.
Cleaning: Clean the outside and inside of the automatic control valve regularly to remove dust, dirt and other impurities, and avoid using corrosive or abrasive materials.
5. Functional testing and troubleshooting
Functional testing: Perform functional tests regularly to ensure that the automatic control valve can open and close normally, and check the working status of the electric actuator.
Troubleshooting: If problems such as valve jamming, leakage or motor failure are found, foreign objects should be cleaned up, the sealing ring should be replaced or the motor power supply should be checked in time.
6. Record and report
Record maintenance: Record each maintenance and servicing, including problems found, measures taken and parts replaced, and regularly summarize and analyze the operating status of the equipment.

The above methods can effectively extend the service life of the automatic control valve and ensure its normal operation.