This standard specifies the classification and labeling, requirements, test methods, inspection rules, package and storage of marine cast steel 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 marine pipeline system.
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 699-1999 Quality Carbon Structural Steels
GB/T 983-1995 Stainless Steel Covered Electrodes
GB/T 1184-1996 Genometrical Tolerancing - Geometrical Tolerances for Features without Individual Tolerance Indications (eqv ISO 2768-2:1989)
GB/T 1220-2007 Stainless Steel Bars
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (eqv ISO 2768-1:1989)
GB/T 1958-2004 Geometrical Porduct Specifecations(GPS) - Geometrical Tolerance - Verification Prescription
GB/T 2501 Marine Pipe Flanges - Connection Dimensions and Mating Face (GB/T 25001-1989，neq ISO 2084:1974)
GB/T 3032 Marks for Marine Piping Valves and Fittings
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)
GB/T 12229-2005 General Purpose Industrial Valve - Specification of Spheroidal Graphite Iron Castings
CB/T 3927 Wall Thickness of Casting Body for Marine Valve
3 Classification and Labeling
3.1 Type
The requirements for type of stop check valve are 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 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.
