API Std 609 Butterfly Valves: Double Flanged, Lug- and Wafer-Type

standard by American Petroleum Institute, 05/01/2004

Full Description

This standard covers design, materials, face-to-face dimensions; pressure-temperature ratings; and examination, inspection, and test requirements for gray iron, ductile iron, bronze, steel, nickel-base alloy, or special alloy butterfly valves that provide tight shutoff in the closed position and are suitable for flow regulation.