![]() This is also a way to judge a manufacturer if they are professional in producing American standard butterfly valves. In comparison with the national standard GB butterfly valve, the flange butterfly valve, and the national standard butterfly valve structure length is the same, but there is a gap between the clip butterfly valve, especially the 6 inch, 8 inch difference between the two specifications/standard is largest. The Class B butterfly valve of the API 609 standard specifies the structure length of the American standard butterfly valve, flange butterfly valve, and lug butterfly valve. Sizes covered are NPS 3 to NPS 24 for Classes 150, 300, and 600. ![]() These valves may have a seat rating less than the body rating. Pressure-temperature rated butterfly valves that have an offset seat and either an eccentric or a concentric disc configuration. Sizes covered are NPS 2 to NPS 48 for valves having ASME Class 125 or Class 150 flange bolting patterns. Manufacturer’s rated cold working pressure (CWP) butterfly valves, usually with a concentric disc and seat configuration. Two butterfly valve categories: Category A Butterfly Valves: Differences between API 609 Category A and Category B Butterfly Valves.
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