Troubleshooting Methods For Ptfe Lined Valves

Lined Valve is a type of fluorine-lined valve. Due to its strong corrosion resistance, it is widely used in various fields such as petroleum, printing and dyeing, and chemical industry.
As mentioned earlier, PTFE-lined valves are specially used to control corrosive or highly corrosive media, so their stability is important. Problems will cause significant economic losses and serious consequences, so timely handling of their failures is particularly important. Below, Lierduo PTFE-lined valve factory will introduce several PTFE-lined valve failure repair methods.
1. Valve body leakage:
Cause:
1. The valve body has sand holes or cracks,
2. The valve body is cracked during repair welding,
Repair method:
1. Polish the suspected cracks and etch them with 4% nitric acid solution. If there are cracks, they can be displayed,
2. Dig and patch the cracks.

2. The valve stem and the threaded nut that matches it are damaged or the valve stem head is broken or the valve stem is bent:
Causes:
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.
Repair methods:
1. Improve the operation and do not use too much force; check the limit device and the over-torque protection device.
2. Select the right material and the assembly tolerance meets the requirements.
3. Replace spare parts.
3. Leakage on the joint surface of the valve cover:
Causes:
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.
Repair methods:
1. Tighten the bolts again or make the clearance of the door cover flange consistent.
2. Replace the gasket.
3. Disassemble and repair the sealing surface of the door cover.