Pressure compensation throttling bidirectional stop valve BLF-10

Daily maintenance of control valve

The routine maintenance of control valve is divided into two parts: patrol inspection and regular maintenance. The patrol inspection is as follows.

1. Learn about the operation of the control valve from the process operators on duty.

2. Check the supply energy (air source, hydraulic oil or power supply) of the regulating valve and related accessories.

3. Check the operation of hydraulic oil system.

4. Check the static and dynamic sealing points of the regulating valve for leakage.

5. Check whether there is looseness or corrosion on the connecting pipeline and joint of the regulating valve.

6. Check the regulating valve for abnormal sound and large vibration, and check the supply situation.

7, check whether the action of the regulating valve is flexible, whether it changes in time when the control signal changes.

8. Listen for abnormal vibration or noise on the valve core and valve seat.

9, found that the problem timely contact processing.

10, completes the patrol inspection records, and archive.

The contents of regular maintenance are as follows:

1. Regularly clean the outside of the control valve.

2. Regularly adjust the stuffing box and other sealing parts of the control valve, and replace the sealing parts when necessary to maintain the tightness of the static and dynamic sealing points.

3. Add lubricating oil to the parts to be lubricated regularly.

4. Regularly drain and clean the air source or hydraulic filtration system.

5. Regularly check the connection and corrosion of each connection point, and replace the connectors if necessary.

Second, the regular calibration of the control valve

Units that have not carried out predictive maintenance of control valves shall conduct regular calibration of control valves. Regular calibration work is preventive maintenance work.

According to different production processes, the periodic calibration of control valves should have different calibration periods. The periodic calibration period of each control valve can be determined by combining the information provided by the manufacturer. Usually, it can be carried out at the same time as the process production is overhauled. When some control valves are used in high pressure, high pressure drop or corrosive situations, the inspection period should be shortened.

The content of inspection is mainly the static performance test of control valve, and corresponding test items can be added when necessary, such as the test of flow characteristics of control valve. Periodic calibration requires relevant test equipment and instruments, as well as replacement parts, so it can usually be entrusted to the manufacturer.