I would like to ask the teacher about flanges and valves
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I would like to ask Teacher Hai Chuan: what are the standards for the ball valves specified in standards 20615 and 20592?
I’m not sure about the valve standards, but this seems to be the flange standard for ball valves. The full name for the pipe flange is HG/T20592-2009; it’s a European standard； HG/T20615-2009 American standard ；
Flanges used for instruments are usually pipe flanges, which come in European and American standards; these correspond to 20615 and 20592 respectively. If you are equipping a pipeline with ball valves, you just need to inform the valve manufacturer of the flange standard model. Transitions are required when the pipe diameters differ.:)
Say you want it, and buy what you want. No problem. Valve manufacturers are concerned about the valve structure.
Ball valves have their own manufacturing standards, but the flanges attached to them must be compatible with the pipeline flanges (either American or European standards)