1 Scope
This standard specifies the structure type, specification, material, test method and inspection rule, marking, packaging, storage and transportation for bolted bonnet steel wedge gate and parallel-double-disc gate valves.
This standard is applicable to flanged and butt-welding end steel gate valves of bolted bonnet and rising stem constructions, with a nominal pressure of PN 16~PN 420, nominal dimension of DN 25~DN 600, service temperature of -29℃~538℃, for such media as petroleum, petroleum product and natural gas.
This Standard is also applicable to threaded and yoked end gate valves.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding any amendments), or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB 150 Steel Pressure Vessels
GB/T 152.4 Fasteners-Counterbores for Hexagon Bolts and Nuts
GB/T 196 General Purpose Metric Screw Threads-Basic Dimensions (GB/T 196-2003, ISO 724: 1993, MOD)
GB/T 197 General Purpose Metric Screw Threads-Tolerances (GB/T 197-2003, ISO 965-1: 1998, MOD)
GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 798 Eyebolt
GB/T 5796.1 Trapezoidal Screw Threads-Part 1: Profiles (GB/T 5796.1-2005, ISO 2901: 1993, MOD)
GB/T 5796.2 Trapezoidal Screw Threads-Part 2: General Plan (GB/T 5796.2-2005, ISO 2902: 1977, MOD)
GB/T 5796.3 Trapezoidal Screw Threads-Part 3: Basic Dimensions (GB/T 5796.3-2005, ISO 2904: 1977, MOD)
GB/T 5796.4 Trapezoidal Screw Threads-Part 4: Tolerances (GB/T 5796.4-2005, ISO 2903: 1993, MOD)
GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 2: Taper internal and external threads (GB/T 7306.2-2000, eqv ISO 7-1: 1994)
GB/T 9113(all parts) Integral Steel Pipe Flanges
GB/T 9124 Specification for Steel Pipe Flanges
GB/T 12220 General purpose industrial valves--Marking (GB/T 12220-1989, idt ISO 5209: 1977)
GB/T 12221 Metal Calves--Face to Face, End to End, Center to Face and Center to End Dimensions (GB/T 12221-2005, ISO 5752: 1982, MOD)
GB/T 12222 Multi-turn Valve Actuator Attachments (GB/T 12222-2005, ISO 5210: 1991, MOD)
GB/T 12224 General Requirements for Industrial Steel Valves (GB/T 12224-2005, ASTM B16.34a: 1998, NEQ)
GB/T 12228 General Purpose Industrial Valves-Specification of Carbon Steel Forgings
GB/T 12229 General Purpose Industrial Valves-Specification of Carbon Steel Castings
GB/T 12230 General Purpose Industrial Valves-Specification of Stainless Steel Castings
JB/T 106 Valves Marking and Paint
JB/T 6440 Methods of Radiographic Examination for Steel Castings Valves
JB/T 8858 Gate Valve-Potential Pressure Life Test Regulation
JB/T 9092 Valve Inspection and Testing
3 Construction Type
The typical construction of gate valve is shown in Figure 1.
