API Std 594
API Std 594
Check Valves: Flanged, Lug, Wafer, and Butt-welding, Ninth Editionstandard by American Petroleum Institute, 02/01/2022
standard by American Petroleum Institute, 02/01/2022
This standard covers the design, materials, face-to-face dimensions, pressure-temperature ratings, inspection, examination, and testing requirements for two types of check valves.