API Std 594

Please note that any addenda or errata may not be included in translated editions of this standard.

Covers design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and test requirements for two types of check valves:

— Type "A" check valves are short face-to-face, and can be wafer, lug, or double- flanged; single-plate or dual-plate; or gray iron, ductile iron, steel, nickel alloy, or other alloy designed for installation between Classes 125 and 250 cast-iron flanges as specified in ASME B16.1, between Classes 150 and 300 ductile-iron flanges as specified in ASME B16.42, between Classes 150 and 2500 steel flanges as specified in ASME B16.5, and between Classes 150 and 600 steel pipeline flanges as specified in MSS SP-44, or steel flanges as specified in ASME B16.47.

— Type "B" bolted-cover swing check valves are long face-to-face as defined in 5.1.2, and can be flanged or butt-welding ends of steel, nickel alloy, or other alloy material. End flanges shall be as specified in ASME B16.5, or ends shall be butt-welding as specified in ASME B16.25.