Regarding the pressure rating of control valves
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I would like to ask everyone: when selecting control valves and on-off valves, should the pressure rating be the same as that of the pipeline, or should it be one grade higher than the pipeline’s pressure rating?
Agree with floors 2 and 3. Generally, the same grade is fine!
The same grade will do. If the entire system has a small number of control valves, and there are only two pressure levels with the higher pressure level being more common, it is sometimes done for the sake of simplifying procurement orders and facilitating on-site installation by ordering the valves in the higher pressure category.
The same rank is fine; that’s all I’ve seen.