Common Troubleshooting Of Ptfe Lined Valves

Lined Valve is a valve product that uses PTFE lining material. If it fails during use, it will affect the normal working efficiency, so it is particularly important to deal with common faults in a timely manner.

1. Valve body leakage:

Cause:

1. The valve body has sand holes or cracks,

2. The valve body is cracked during welding,

Treatment:

1. Polish the suspected cracks and etch them with 4% nitric acid solution. If there are cracks, they can be displayed,

2. Dig and repair the cracks.

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2. The valve stem and the threaded nut that matches it are damaged or the valve stem head is broken, and the valve stem is bent:

Cause:

1. Improper operation, excessive force on the switch, failure of the limit device, and failure of the over-torque protection.

2. The thread is too loose or too tight.

3. Too many operations and too long service life.
Treatment:
1. Improve the operation, do not use too much force; check the limit device and the over-torque protection device.
2. Select the appropriate material and the assembly tolerance meets the requirements.
3. Replace the spare parts.
3. Leakage on the joint surface of the valve cover:
Reason:
1. The bolts are not tightened enough or are tightened unevenly.
2. The gasket does not meet the requirements or the gasket is damaged.
3. The joint surface is defective.
Treatment:
1. Tighten the bolts or make the gap between the door cover flange consistent.
2. Replace the gasket.
3. Disassemble and repair the sealing surface of the door cover.