American standard specifications for stop valves
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For globe valves in GB/T12235, there is only the PN series, no Class series. What standards do the stop valves in the Class series comply with?
Both GB/T12237 \"Ball valves for use in the petroleum, petrochemical, and related industries\" and GB/T12234 \"Steel gate valves with stud-connected valve covers for use in the petroleum and natural gas industries\" specify both PN series and Class series. However, in GB/T12235 \"Steel globe valves and lift check valves for petroleum, petrochemical, and related industries\", only the PN series is available, with no Class series. In this case, among national standard valves, ball valves and gate valves both come in class series, but globe valves do not have any valves in the class series. Apart from these valves from abroad, are there Class-series valves available in the national standard series?
API STD 623 Steel Globe Valve
Uh. 12234 and 12237? ? These two should be the manufacturing standards. Moreover, there is no such thing as a \"class\" series; that is part of the standards set by the American Petroleum Institute. Our national standards follow the PN series from European standards
I would like to ask: for flanges, should Class flanges as specified in HG/T20615 be used? Can valves from the American Petroleum Institute be employed? How is it usually chosen?
API 6D. . . . . Those who need advice on pipeline valves can leave a message for me or add Chuan You.
Shouldn’t it be the valve that determines the flange gasket and fasteners to be used? American standards are rarely used; API corresponds to ASME and ANSI. As for whether it corresponds to 20615, I’m not sure enough to say, but it’s likely possible. The Ministry of Chemical Industry has standards for American-standard flange gaskets and fasteners, but none for valves