Pre-operation inspection
Before operating the valve, conduct a functional test. Assign a dedicated person to observe the on-site movement of the valve and damper.
Check whether the actuator linkage, connecting rod and pins are secure, free from deformation, and not falling off.
Confirm that the valve position shown on the DCS is consistent with the actual on-site position.
Verify that the open/close direction is correct and the movement is smooth and flexible.
If an interlock system exists, perform an interlock test together with relevant personnel.
If any abnormal condition occurs during the test, stop the operation immediately and inform maintenance staff for troubleshooting.
Internal leakage judgment
Determine whether the valve has internal leakage by checking the temperature of the downstream pipeline.
For pipelines without temperature instruments, use an infrared thermometer or touch comparison of the upstream and downstream pipe walls to judge leakage.
If internal leakage is confirmed on an electric valve, close the manual isolation valve in front of it.
If no manual isolation valve is installed and the leakage is severe, manually close the electric valve, record the defect, and report it to maintenance.
Defect inspection and reporting
Perform a full inspection for valve defects, especially leakage. Any abnormal or leaking valve must be recorded and reported to the responsible maintenance department in a timely manner.
Post-opening confirmation
After opening the drain valve, check for temperature at the outlet or throttle orifice to confirm that the draining function is effective.
This ensures that condensate is properly discharged and prevents corrosion of thermal pipelines caused by water accumulation due to blocked valves, pipelines, or orifices.
