Internal leakage of the valve
Thread Content
DN80 diameter； Valve body material: 316L ； Sealing material: PTFE ； Transport medium: Saturated sodium sulfate solution with a solid content of around 10% ； Operating temperature: ≤100℃ ； Great Master Gate, please help analyze the reason: handshake
The possible reasons for internal leakage in valves include the following: 1. Sealing material issues: Although PTFE has good chemical resistance, it may age over time due to heat or corrosion by the medium, resulting in a decline in its sealing performance. 2. Damaged sealing surface: The valve’s sealing surface may be damaged or worn due to erosion by media containing solid particles. 3. Improper valve installation: If the valve is not installed in strict accordance with the specifications, it may result in poor sealing. 4. Wear of the valve stem or other moving parts: Over time, wear of components such as the valve stem can also lead to a deterioration in the sealing performance. It is recommended to check whether the valve’s seals need to be replaced, and to inspect the valve body and stem for any signs of wear or damage. At the same time, ensure that valve installation and maintenance are carried out in accordance with standards. .
These valve seats are severely damaged; the sealing function has completely failed. It would be strange if there were no internal leakage{:9001:}
Could you help analyze the reason? Is it a problem with the quality of the valve or with its design and selection?
What is the operating pressure of the valve? Is it because it’s too close to the pressure source? PTFE is too soft and gets cut off by the high-pressure flow.
No fireproof groove was provided to protect the valve seat, which caused the seat to come loose; this led to the valve seat being severed when the valve was opened and closed.
The medium contains solids. What is the temperature when it is ≤100°? PTFE at 90~100° for a long time also doesn’t work. How long has this valve been in use before it became in such poor condition? If cost is a concern, it’s sufficient to simply replace the valve seat. Or replace it with a valve seat that is more wear-resistant and heat-resistant. There are PEEK, PPL, molon, TFM. If you want to use it for a long time, you might consider using hard balls or V-balls. Hard balls are more expensive, while V balls are cheaper. Clamped V-ball should be cheaper. The V-ball can scrape through media containing solids.
The analysis is quite comprehensive; the reasons can basically be found in these few points
Do ordinary ball valves also need to have fire-resistant grooves?
What if I keep this ball valve at 50% open for an extended period of time?