BUHLMANN Rohr-Fittings-Stahlhandel GmbH + Co. KG
Buhlmann Tubes, Fittings and Flanges for Steam Boilers, Chemical Plant Construction and Oil and Gas Industry. Our products correspond to both current international (API) and European (EN) standards
Code and standard: API STD 623
API STD 623 covers design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and test requirements for gray iron, ductile iron, bronze, steel, nickel-based alloy, or special alloy butterfly valves.
The following two categories of butterfly valves are included:
- Category A—Manufacturer’s rated cold working pressure (CWP) butterfly valves, usually with a concentric disc and seat configuration. Sizes covered are NPS 2 to NPS 60 for valves having ASME Class 125 or Class 150 flange bolting patterns.
- Category B—ASME class and pressure-temperature-rated butterfly valves that have an offset seat and either an eccentric or a concentric disc configuration.
Sizes covered are listed below:
- for lug and wafer, Class 150 and 300: NPS 2 to NPS 60;
- for lug and wafer, Class 600: NPS 3 to NPS 60;
- for double-flanged short and long pattern, Class 150, 300, and 600: NPS 3 to NPS 60;
- for butt-welding ends, Class 150, 300 and 600: NPS 3 to 60;