The units that have not carried out the predictive maintenance of the regulating valve shall check the regulating valve regularly. Periodic check work is preventive maintenance work.
According to the different process of production, the regular calibration of the regulating valve should have different calibration cycles. The periodic calibration period of each regulating valve can be determined by combining with the data provided by the manufacturer. It can usually be carried out at the same time as a major overhaul of the process production process. Some control valves are used in high pressure, high pressure drop or corrosive occasions, the inspection cycle should be shortened.
The main content of the inspection is the static performance test of the regulating valve. If necessary, the corresponding test items can be added, such as the test of the flow characteristics of the regulating valve. Periodic calibration requires testing equipment and instruments, as well as replacement parts, so it can usually be done by a manufacturer.
