What causes the valve shaft of a hard-sealed ball valve to stick and get stuck in the valve body?
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What causes the valve shaft of a hard-sealed ball valve to stick to the valve body and become unable to move fully? Is there a good solution? I hope some experienced users can give me some advice. Thanks first
Is the valve shaft stuck to the valve body? Which part was it, and was it discovered after it was taken apart?
Poster: Please send a photo. Is it a fixed-axis ball valve?
You can use a rubber mallet to strike the valve body, hitting different areas several times, and then give it another try. If that doesn’t work, use an iron hammer, but be careful not to strike too hard to avoid damaging the valve; pay attention to safety. As a last resort, you can disassemble the valve, but I hope you won’t need to do that
This post was last edited by -valve- on 2010-11-23 08:35. The explanation is not clear; there are many factors that can cause the problem mentioned by the original poster. For example: 1. Issues with the valves used: What medium is flowing through the pipes? What are the properties of the medium? What is the operating temperature? Is there crystallization or solidification in the medium that is causing the valve stem to get stuck? Are there any foreign objects in the medium? 2. Issues with valve products: Has the valve stem not undergone the appropriate material treatment? Is the surface roughness too poor? Assembly issue? Therefore, only by clarifying the situation can we identify the root cause.
This situation occurs when the material chosen for the valve stem is too soft or is the same as that of the valve body; it can also arise if there are issues with the machining dimensions of the valve stem and the valve body. I’ve encountered similar problems as well; in the end, we turned the valve stems on a lathe by about 0.5 mm, and they were good to use again. If it is a problem with the valve stem material, the only solution is to use a material that is even harder than that of the valve body.