Maintenance procedure of the hottest valve

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Procedures for valve maintenance

General procedures for valve maintenance:

1. When the valve is removed, use steel characters to mark the maintenance number on the valve and the flange connected with the valve, and record the working medium, working pressure and working temperature of the valve, so that corresponding materials can be selected during repair

2. It is required to maintain the valve in a clean environment. First, clean the external surface of the simple daily maintenance of the valve impact tester, or blow it with compressed air or clean it with kerosene. But remember the nameplate and other identifications. Check and build a brand with high quality and low price, check the appearance damage and make records. Then disassemble the other parts of the valve, clean them with kerosene (do not clean them with gasoline, so as to avoid fire, such as glass, metal and hard plastic packaging), check the damage of other parts and make records

3. Conduct strength test on valve body and bonnet. If it is a high-pressure valve, nondestructive testing should also be carried out, such as ultrasonic testing. The X-ray rubber fatigue testing machine is of the same kind, which will not affect the operation of the equipment due to the influence of external forces

4. Red lead powder can be used to inspect the sealing ring, and the coincidence degree of valve seat and gate (valve Office). Check the valve rod for bending, corrosion and thread wear. Check the wear of the valve stem nut

5. Deal with the detected problems. Repair welding defects of valve body. Weld or renew the sealing ring. Straighten or replace the valve rod. Repair all other parts that should be repaired; Replace if it cannot be repaired

6. Reassemble the valve. During assembly, all gaskets and fillers shall be replaced

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