After the normal operation of the valve to be maintained and maintained. Regulators, as part of an automated control system, should be maintained at the same time as the automation instrumentation and other equipment. Control valve maintenance and general maintenance of similar instruments can be divided into passive maintenance, preventive maintenance and predictive maintenance. Passive maintenance is a maintenance method when equipment such as regulating valves fail. As a result of equipment failure to maintain Therefore, often resulting in the production process parking, serious or even equipment damage or casualties. Passive maintenance is not the maintenance of the production process, preventive maintenance is based on past operating experience, maintenance of a maintenance method over time. For example, regular maintenance is commonly used as preventive maintenance. It develops a maintenance schedule based on the operation of different equipment and maintains it when the equipment has not failed. As the failure did not happen for maintenance, therefore, can greatly reduce the probability of failure. However, this maintenance method does not analyze the current actual situation of the regulating valve, and often has time and resources wasted by dismantling and checking the regulating valve which can also be used for a certain period of time. Predictive Maintenance Starting from the currently used control valve data analysis, the status of the control valve is foreseen to maximize the use of the control valve. Control valve routine maintenance work is divided into roving inspection and regular maintenance of two parts, circuit inspection work is as follows: 1. To the process technology operator to understand the operation of the control valve. 2. Check the supplied energy (air, hydraulic, or power) for the regulator and related accessories. 3. Check hydraulic system operation. 4. Check the control valve of the static and dynamic sealing point for leaks. 5. Check the regulator valve connection pipe and fittings are loose or corroded. 6. Check whether there is an abnormal sound valve to the control valve and a large vibration, check the supply. 7. Check the action of the regulating valve is flexible, whether changes in time when the control signal changes. 8. Listen to the valve core, valve seat with or without abnormal vibration or noise. 9. Find the problem in a timely manner to deal with. 10. Do tour inspection records, and archive. Regulatory valve regular maintenance as follows: 1. Regular external control valve cleaning. 2. Regulating valve stuffing box and other sealing components on a regular basis to be adjusted, if necessary, seal components should be replaced to maintain the sealing point of static and dynamic seal. 3. Lubricate parts regularly to be lubricated. 4. Periodically blow or clean gas source or hydraulic filter system. 5. Regularly check the connection points of the connection, corrosion, if necessary, should replace the connector. Regulatory valve regularly check: Regulatory valve predictive maintenance work has not yet carried out the unit, the valve should be regularly checked. Regular calibration is preventive maintenance work. According to different process of production process, regular calibration valve should have different calibration cycle. The information provided by the manufacturer can be used to determine the periodic calibration of the valve. Usually in the process of production overhaul at the same time. Some control valves used in high pressure, high pressure drop or corrosive strong occasions, the inspection cycle to be shortened. The main test is the static performance test valve, if necessary, increase the appropriate test items, such as regulating valve flow characteristics of the test. Periodic calibration requires test equipment and instrumentation, as well as replacement parts, so it is usually commissioned by the manufacturer.
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