1. Before starting, valve test should be carried out. A dedicated person should monitor the action of valve and damper on site. Check that the connecting rod and pin of the actuator are not loose, bent or falling off. Check that the DCS opening indication is consistent with the on-site indication. The direction of the regulating door switch is correct and the action is flexible. If there is an interlocking circuit, the interlocking test should be carried out together with relevant professionals. If an abnormality occurs during the test, the test should be stopped and the maintenance personnel should be notified in time for processing.
2. The valve should be analyzed and judged whether it is leaking internally based on the temperature indication of the pipeline behind the valve. For those without temperature indication behind the drain valve, the temperature of the pipe wall before and after the valve should be measured with an infrared thermometer or by hand to judge whether the valve is leaking internally. If the electric valve leaks internally, the manual isolation door in front of the electric door should be closed. For those without manual isolation door in front of the drain electric door, if the internal leakage is large, the electric door should be manually shaken and closed, and the defect should be logged and contacted for maintenance.
3. Carry out a comprehensive inspection of valve defects (leakage). The leaking valve should be logged and the relevant maintenance department should be notified.
4. After the drain valve is opened, check whether there is temperature behind the valve or throttle hole to ensure that it can play a draining role and prevent corrosion caused by water accumulation in the thermal pipeline due to blockage of the valve, pipeline or throttle hole.
