This standard specifies the requirements, test methods, test preparation, marking, packaging, protection and storage of marine piping valves and fittings (hereinafter referred to as valves and fittings).
This standard is applicable to the design, manufacturing and acceptance of universal valves and fittings of marine piping.
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 197-2003 General Purpose Metric Screw Threads - Tolerances (ISO 965-1:1998, MOD)
GB/T 1031-1995 Surface Roughness Parameters and Their Values (neq ISO 468:1982)
GB/T 1182-1996 Geometrical Tolerancing - Generalities, Definitions, Symbols, Indications on Drawings (eqv ISO 1101:1996)
GB/T 1184-1996 Geometrical Tolerancing - Geometrical Tolerance for Features without Individual Tolerance Indications (eqv ISO 2768-2:1989)
GB/T 1801-1999 Limits and Fits - Selection of Tolerance Zones and Fits (eqv ISO 1829:1975)
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 Product Specification (GPS) - Geometrical Tolerance - Verification Prescription
GB/T 3032 Marks for Marine Piping Valves and Fittings
GB/T 3098.6-2000 Mechanical Properties of Fasteners - Stainless Steel Bolts, Screws and Studs (idt ISO 3506-1:1997)
GB/T 3098.10-1993 Mechanical Properties of Fasteners - Bolts, Screws, Studs and Nuts Made of Non-ferrous Metals (eqv ISO 8839:1986)
GB/T 3098.15-2000 Mechanical Properties of Fasteners - Stainless Steel Nuts (idt ISO 3506-2:1997)
GB/T 5796.4-2005 Trapezoidal Screw Threads - Part 4: Tolerances (ISO 2903:1993, MOD)
GB/T 11698 Metal Valves for Use in Flanged Pipe Systems - Face-to-face and Centre-to-face Dimensions (GB/T 11698-2008, ISO 5752:1982, MOD)
CB/T 3927 Wall Thickness of Casting Body for Marine Valve
3 Requirements
3.1 Materials
3.1.1 Valve body and deck
The bodies and decks of valves and fittings shall be manufactured with materials meeting the requirements of relevant classification specifications. The application of new materials shall be verified and evaluated.
See Appendix A for common materials of valve body and deck.
3.1.2 Other parts
According to the functions of parts, other valve and fitting parts shall be manufactured with the anti-corrosion materials complying with their functions.
See Appendix A for materials of common valve and fitting parts.
3.2 Wall thickness
The wall thickness of valves and fittings shall meet the requirements of CB/T 3927 in general situation while may be separately determined in special situation.
