API STD 594-1991
Wafer and Wafer-Lug Check Valves (Fourth Edition)

Standard No.

API STD 594-1991

Release Date

1991

Published By

API - American Petroleum Institute

Status

Be replaced 2004-08

Replace By

API STD 594-1997

Latest

API STD 594-2022

API STD 594-1991 history

• 1970 API STD 594-2022 Check Valves: Flanged, Lug, Wafer, and Butt-welding (Seventh Edition)
• 1970 API STD 594-2017
• 2010 API STD 594-2010 Check Valves: Flanged@ Lug@ Wafer@ and Butt-welding (Seventh Edition)
• 2004 API STD 594-2004 Check Valves: Flanged@ Lug@ Wafer and Butt-welding (Sixth Edition)
• 1997 API STD 594-1997 Check Valves: Wafer@ Wafer-Lug@ and Double Flanged Type (Fifth Edition)
• 1991 API STD 594-1991 Wafer and Wafer-Lug Check Valves (Fourth Edition)