Key inspection parts in case of failure of control valve

Key inspection parts in case of failure of control valve

In industrial automation instruments, the control valve is bulky and simple in structure, which is often ignored by people. However, in the process pipeline, the working conditions are complex. Once there is a problem, everyone is busy. Because of its bulkiness, problems are difficult to find, often laborious and thankless, and it also involves system operation, system integrity, regulation quality, environmental pollution, etc. Today, Xiaobian will introduce several methods to you. When the control valve fails, we should focus on the important parts to check, and don't rush in case of failure in the future!

For the inner wall of the valve body, for the control valve used in the occasions of high pressure difference and corrosive medium, the inner wall of the valve body is often impacted and corroded by the medium, and the pressure resistance and corrosion resistance must be emphatically checked.

1. The inner wall of the valve body. For the control valve used in the occasions of high pressure difference and corrosive medium, the inner wall of the valve body is often impacted and corroded by the medium, and the pressure resistance and corrosion resistance must be emphatically checked.

2. When the valve seat and control valve are working, due to the penetration of medium, the inner surface of the thread used to fix the valve seat is easy to be corroded, which makes the valve seat loose. Attention should be paid during inspection. For valves working under high pressure difference, check whether the sealing surface of the valve seat is damaged.

3. The valve core is a movable part of the control valve when it works. It is washed by the medium and the corrosion is the most serious. During maintenance, carefully check whether all parts of the valve core are corroded and worn, especially under the condition of high pressure difference, the wear of the valve core is more serious (due to cavitation) and attention should be paid. Replace the valve element when it is seriously damaged. In addition, pay attention to whether the valve stem is also

4. There are similar phenomena, or the connection with the valve core is loose, etc.

5. Whether the "O" ring and other gaskets are aging and cracked.

6. Pay attention to whether the polytetrafluoroethylene packing, sealing grease are aging, and whether the mating surface is damaged. Replace it if necessary.