1 Scope 1.1 Subject content This standard specifies the requirements, quality assurance provisions and delivery preparation of aluminum alloy pipeline valves (hereinafter referred to as valves) 1, 2 Scope of application This specification applies to the design, manufacture and acceptance of cast and forged aluminum alloy valves with a nominal pressure of .4 MPa and a working temperature not higher than 100°C. This specification does not apply to the design, manufacture and acceptance of special valves for main and auxiliary machines. 2 References GB /T 600-1991 General technical conditions for ship piping valves GB/T 1173-1995 Cast aluminium alloys GB/T 1184-1996 Tolerances on shape and position without indicating tolerance values GB/T 1804-1992 General tolerances without indicating tolerances for linear dimensions GB/T 3032-1989 Marking of ship piping accessories GB/T 9438-1999 Aluminium alloy castings CB/T 862.1-1988 Technical conditions for non-ferrous metal forgings Aluminium alloy die forgings and free forgings CB*/Z 92-81 Anodising treatment of aluminium alloys
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