Leakage ratings of control valves and shut-off valves
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In the specification sheets for control valves and isolation valves filled out for a project, leakage ratings are specified. Are ANSI B16.104Ⅵ and API 598 equivalent in terms of rating? I checked online and found that API598 is a standard for testing valves; does this API598 standard specify whether a valve has passed the tests or do there be different grades?
I shared two links related to this just a couple of days ago; please go and check out the relevant content (the ANSI standards are excerpts). I hope it will be helpful to you. http://www.docin.com/p-495483818.html ANSI B16.104 http://www.doc88.com/p-7445651263218.html API 598 (English on the front, Chinese on the back)
The leakage class of control valves is in accordance with ANSI FCI70-2 -2013 (ANSI B16.104)； The leak test for switch valves is conducted in accordance with API598.