Summary Of The Causes Of Leakage Caused By Ptfe Lined Valves

Lined Valve is a type of valve. The leakage of PTFE-lined valves is divided into two categories, one is the leakage of the sealing surface, and the other is the leakage of the sealing ring root. So what are the main causes of leakage? What are the possible reasons? Let us count the possible causes of leakage below.

Introduction to common types of PTFE-lined valves

The causes of leakage are:

1. The sealing surface is not well ground.

2. The sealing ring and the valve seat and the valve disc are not tightly matched.

3. The valve disc and the valve stem are not firmly connected.

4. The valve stem is bent and twisted, so that the upper and lower closing parts are not centered.

5. Closing too quickly, the sealing surface is not in good contact or has been damaged for a long time.

6. Improper material selection, can not withstand the corrosion of the medium.

7. Use the stop valve and gate valve as a regulating valve. The sealing surface cannot withstand the erosion of high-speed flowing media.

8. Some media gradually cool down after the valve is closed, causing fine cracks on the sealing surface, which will also cause erosion.
9. Threaded connections are used between some sealing surfaces and valve seats and valve discs, which are prone to produce oxygen concentration difference cells and corrode and loosen.
10. Impurities such as welding slag, rust, and dust are embedded, or mechanical parts fall off in the production system and block the valve core, making the valve unable to close tightly.

For these possible reasons for the leakage of PTFE lined valves, corresponding preparations should be made and relevant preventive measures should be taken to prevent leakage.