This standard specifies the product classification, technical requirements, test methodss, inspection rules, marking and packaging of cast steel flanged seawater stop check valves (hereinafter referred to as stop check valves) with flange connection dimension in accordance with those specified in GB 569 and GB 2501.
This standard is applicable to the marine pipeline system with fresh water and seawater as the medium.
2 Normative References
GB 569-65 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB 600-91 General Specifications for Marine Piping Valves and Fittings
GB 2501-89 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB 3032-89 Marks for Marine Piping Valves and Fittings
GB 11698-89 Metal Valves for Use in Flanged Pipe Systems - Face-to-face and Centre-to-face Dimensions
ZB/T U52 001-89 Wall Thickness of Casting Body for Marine Valve