How to repair the gas pressure reducing valve?
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Release Time：2021-02-01
Valves are widely used in boilers, chemicals, oil pipelines for opening and closing adjustment purposes. Due to the high temperature, high pressure, strong corrosion operation, the seat plane is vulnerable to damage, resulting in lax and leakage.
Valves are widely used in boilers, chemicals, oil pipelines for opening and closing adjustment purposes. Due to the high temperature, high pressure, strong corrosion operation, the seat plane is vulnerable to damage, resulting in lax and leakage. A valve, if only the valve seat plane damage and the whole is scrapped, is too wasteful. So, how should the gas pressure reducing valve be overhauled? We can learn and understand through the following articles!
When the gas pressure reducing valve is removed, use steel characters on the gas pressure reducing valve and the flange connected with the valve, make a maintenance number, and record the working medium, working pressure and working temperature of the valve, so that the corresponding materials can be selected for repair. Maintenance of gas pressure reducing valve, requirements in a clean environment. First, clean the outer surface of the gas pressure reducing valve, or use compressed air to blow or use kerosene to clean. But to remember the nameplate and other identification. Check the appearance damage and make records. Then disassemble the other parts of the steam gas pressure reducing valve, clean it with kerosene (do not clean it with gasoline to avoid fire), check the damage of the other parts, and make records. Body bonnet strength test. Such as the Department of high-pressure gas pressure reducing valve, but also for non-destructive testing, such as ultrasonic flaw detection, X-ray flaw detection.
The sealing ring can be tested with red Dan powder, and the fit of the valve seat and disc (valve office) can be tested. Check the stem for bending, corrosion and thread wear. Inspect the stem nut for wear. Handle the problems detected. Repair welding defect of valve body. Surfacing or renewal of seal ring. Straighten or replace the stem. Repair all other parts that should be repaired; replace those that cannot be repaired. Reassemble the steam gas pressure reducing valve. When assembling, the gasket and packing should be completely replaced.
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