This document specifies the terms and definitions, structural types, basic requirements, technical requirements, test methods, inspection rules, marking, painting, packaging and storage of metal-sealed axial flow check valves (hereinafter referred to as axial flow check valves). Shipping and quality commitment. This document is applicable to nominal sizes DN50 to DN1 800, nominal pressures PN16 to PN400, nominal sizes NPS 2 to NPS 72, and pressure classes Class150 to Class2 500. The end connection form is flange or welded connection, and the applicable temperature is -29 ℃ ~ 649 ℃ metal seal axial flow check valve. Metal-sealed axial flow check valves with threaded connections and clamp connections at the ends should meet the same requirements.
T/ZZB 2878-2022 history
2022T/ZZB 2878-2022 Metal seal non-slam axial flow check valves