1. When the valve is removed, use the steel word on the valve and the flange connected to the valve, and set the inspection number, and record the working medium, working pressure and working temperature of the valve, so that the corresponding materials can be selected for repair.
2. The valve should be in a clean environment. First clean the outer surface of the valve, or blow it with compressed air or with kerosene. But remember the nameplate and other signs. Check the appearance of damage and make a record. Then remove the valve parts and clean them with kerosene (do not use gasoline to avoid fire), check the damage of other parts, and make a record.
3. Perform a strength test on the valve body bonnet. If it is a high-pressure valve, it must also perform non-destructive testing, such as ultrasonic flaw detection and x-ray inspection.
4, the seal ring can be used for red dan powder inspection, valve seat, ram (valve office). Check the stem for bending, corrosion, and thread wear. Check the stem nut for wear.
5. Handle the problems that have been checked. Valve body repair welding defects. Surfacing or renewing the seal. Straighten or replace the valve stem. Repair all parts that should be repaired; they cannot be replaced by the repairer.
6. Reassemble the valve. When assembling, replace the gasket and packing.
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