Leakage class of metal hard-sealed ball valves
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I would like to ask the experts here: has anyone used metal hard-sealed ball valves with a sealing level that ensures no visible leaks, namely ISO 5208 Class A? I need such valves for one of my projects, and I’m looking for recommendations on valve manufacturers – preferably well-known brands.
There’s no sealing medium, no pressure, no temperature – that’s the problem, hehehehe~~~~
I asked the factory, and they said that the leakage level of metal hard-sealed ball valves can reach ISO 5208 Class A.
The medium is natural gas; the design pressures range from 1.0 to 9.8 MPa, while the design temperatures are -52/65°C. The material used is Trim 316
Why must a metal hard-sealed ball valve be used?
Under the above conditions, the risks associated with soft-sealed ball valves are much lower
After checking the standards, Grade A is considered the most basic
In such cases, a hybrid seal is required at the very least. First, the soft seal takes effect. A hard seal is used as the second layer of sealing; otherwise, a hard seal alone cannot achieve zero leakage. You can add me on WeChat.