This standard specifies the classification and labeling, requirements, test methods, inspection rules, package and storage of marine cast iron flanged stop check valves (hereinafter referred to as stop check valves) with flange connection dimension and sealing face in accordance with those specified in GB/T 569 and GB/T 2501.
This standard is applicable to the design, manufacturing and acceptance of stop check valves for pipeline system with seawater, fresh water, lubricating oil and fuel oil as medium.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 569 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB/T 600 General Specifications for Marine Piping Valves and Fittings (GB/T 600-1991, neq ISO 5208: 1982)
GB/T 1176-1987 Specification for Cast Copper Alloys (neq ISO 1338: 1977)
GB/T 1184-1996 Geometrical Tolerancing - Geometrical Tolerance for Features without Individual Tolerance Indications ((eqv ISO 2768-2: 1989)
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (eqv ISO 2768-1: 1989)
GB/T 1958 Geometrical Product Specification (GPS) - Geometrical Tolerance - Verification Prescription
GB/T 2501 Marine Pipe Flanges - Connection Dimensions and Mating Face (GB/T 2501-1989, neq ISO 2084: 1974)
GB/T 3032 Marks for Marine Piping Valves and Fittings
GB/T 4423-1992 Copper and Copper-alloy Cold-drawn Rod and Bar
GB/T 9439-1988 Grey Iron Castings
GB/T 11698 Metal Valves for Use in Flanged Pipe Systems - Face-to-face and Centre-to-face Dimensions (GB/T 11698-1989, neq ISO 5752: 1982)
CB/T 3927 Wall Thickness of Casting Body for Marine Valve
3 Classification and Labeling
3.1 Type
The types of stop check valves are specified as follows:
Type A - through-type stop check valve with flange connection dimension and sealing face in accordance with GB/T 569;
Type B - perpendicular-type stop check valve with flange connection dimension and sealing face in accordance with GB/T 569;
Type AS - through-type stop check valve with flange connection dimension and sealing face in accordance with GB/T 2501;
Type BS - perpendicular-type stop check valve with flange connection dimension and sealing face in accordance with GB/T 2501.
3.2 Basic parameters
See Table 1 for the basic parameters of stop check valve.
