This standard specifies the classification and labeling, requirements, test methods, inspection rules, package and storage of wafer type check valves (hereinafter referred to as check valve) with flange connection dimension and sealing face in accordance with GB/T 2501. This standard is applicable to the design, manufacturing and acceptance of check valves for system with fresh water, seawater or inert gas as the medium.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 600-2008 General Specifications for Marine Piping Valves and Fittings
GB/T 1176-1987 Specification for Cast Copper Alloys
GB/T 1184-1996 Geometrical Tolerancing - Geometrical Tolerance for Features without Individual Tolerance Indications
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications
GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical Tolerance - Verification Prescription
GB/T 2501 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB/T 3032 Marks for Marine Piping Valves and Fittings
HG/T 2579-2008 Rubber Compounds of O-rings Used for Hydraulic Fluid Power system
3 Classification and Labeling
3.1 Classification
The types of check valve are specified as follows:
Type A - is applicable to the check valve for system with fresh water and seawater as the medium;
Type B - is applicable to the check valve for system with inert gas as the medium.
Note: see Appendix A (informative) for the installation requirements of check valve.
3.2 Basic parameters
See Table 1 for the basic parameters of check valves.
