Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This Standard is not equivalent to its counterpart ISO 10434: 2004/API 600-2001 "Bolted Bonnet Steel Gate Valves for the Petroleum, Petrochemical and Allied Industries", and by comparison, their technical contents and text structures differ significantly.
——The dimension requirement of butt-welding ends in 5.3.2 of ISO 10434: 2004 were cancelled;
——The dimension requirement of auxiliary connections in 5.12 of ISO 10434: 2004 were cancelled;
——The welding for fabrication and repair of 6.3 was not adopted;
——The specific contents of Chapter 7 Testing, inspection and examination was not adopted;
——The minimum body and seat diameters were added.
This Standard is a revision of GB/T 12234-1989 "General Purpose Industrial Valves-Flanged and Butt-weld Steel Gate Valves". The main changes between this Standard and GB/T 12234-1989 are as follows:
——The standard name was revised to "Bolted Bonnet Steel Gate Valves for the Petroleum and Natural Gas Industries";
——The minimum body wall thickness requirement was revised;
——The minimum body and seat diameter requirements were added;
——The bolt tensile stress requirement was modified;
——The weld-deposited thickness requirement of sealing surface was modified;
——The minimum stem diameter requirement was modified;
——The packing and packing box requirements were modified;
——The body-to-bonnet bolting requirement was modified;
——The potential pressure life test times requirement and technical contents of non-destructive inspection were added;
——The materials requirements were modified and the stem material hardness requirement was added;
——The test methods and inspection requirements were modified and type test items and requirements were added;
——The marking details and supply requirement were modified;
——The details of Appendix A "selection of gate and seat sealing surfaces and trim materials" in GB/T 12234-1989 GB/T 12234-1989 was transferred to the text;
——Appendix A "Order Contract Data Sheet" was added.
This Standard replaces GB/T 12234-1989 from the implementation date hereof.
Appendix A of this standard is informative.
This Standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Valves of Standardization Administration of China (SAC/TC 188).
Drafting organizations of this Standard: Hefei General Machinery Research Institute, Henan Kaifeng High Pressure Valve Co., Ltd., Shanghai Lianggong Valve Factory Co., Ltd. and Wuhan Boiler Group Valve Co., Ltd.
Chief drafting staffs of this Standard: Wang Xiaojun, Lu Huancheng, Yang Heng, Lv Zhaozheng and Zhang Huidong.
The previous edition replaced by this Standard is as:
——GB/T 12234-1989.
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
中华人民共和国国家标准
GB/T 12234-2007
Bolted Bonnet Steel Gate Valves for the Petroleum and Natural Gas Industries
石油、天然气工业用螺柱连接阀盖的钢制闸阀
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 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 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.
Figure 1 Typical Construction of Gate Valve
4 Technical Specifications
4.1 Pressure/Temperature Ratings
4.1.1 The pressure/temperature ratings of gate valve shall be in accordance with those specified in GB/T 12224. As for those imposed by special soft seals or special trim materials, the pressure/temperature ratings are allowed to be less than those of the gate valve shell material. The lower value shall be adopted and marked on the valve identification plate.
4.1.2 Double-seated and sealed gate valves for low-temperature medium may be capable of trapping medium in the center cavity of the valve when in the closed position. If subjected to an increase in temperature, an excessive buildup of pressure may occur leading to a gate valve shell failure. Where such condition is possible, a pressure relief device shall be additionally provided in the center cavity of the valve, which shall be stated in the order contract.
Foreword i 1 Scope 2 Normative References 3 Construction Type 4 Technical Specifications 5 Materials 6 Test Methods and Inspection Rules 7 Marking 8 Protection, Packaging, Storage and Transportation Appendix A (Informative) Order Contract Data Sheet of Bolted Bonnet Steel Gate Valves for the Petroleum and Natural Gas Industries
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This Standard is not equivalent to its counterpart ISO 10434: 2004/API 600-2001 "Bolted Bonnet Steel Gate Valves for the Petroleum, Petrochemical and Allied Industries", and by comparison, their technical contents and text structures differ significantly.
——The dimension requirement of butt-welding ends in 5.3.2 of ISO 10434: 2004 were cancelled;
——The dimension requirement of auxiliary connections in 5.12 of ISO 10434: 2004 were cancelled;
——The welding for fabrication and repair of 6.3 was not adopted;
——The specific contents of Chapter 7 Testing, inspection and examination was not adopted;
——The minimum body and seat diameters were added.
This Standard is a revision of GB/T 12234-1989 "General Purpose Industrial Valves-Flanged and Butt-weld Steel Gate Valves". The main changes between this Standard and GB/T 12234-1989 are as follows:
——The standard name was revised to "Bolted Bonnet Steel Gate Valves for the Petroleum and Natural Gas Industries";
——The minimum body wall thickness requirement was revised;
——The minimum body and seat diameter requirements were added;
——The bolt tensile stress requirement was modified;
——The weld-deposited thickness requirement of sealing surface was modified;
——The minimum stem diameter requirement was modified;
——The packing and packing box requirements were modified;
——The body-to-bonnet bolting requirement was modified;
——The potential pressure life test times requirement and technical contents of non-destructive inspection were added;
——The materials requirements were modified and the stem material hardness requirement was added;
——The test methods and inspection requirements were modified and type test items and requirements were added;
——The marking details and supply requirement were modified;
——The details of Appendix A "selection of gate and seat sealing surfaces and trim materials" in GB/T 12234-1989 GB/T 12234-1989 was transferred to the text;
——Appendix A "Order Contract Data Sheet" was added.
This Standard replaces GB/T 12234-1989 from the implementation date hereof.
Appendix A of this standard is informative.
This Standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Valves of Standardization Administration of China (SAC/TC 188).
Drafting organizations of this Standard: Hefei General Machinery Research Institute, Henan Kaifeng High Pressure Valve Co., Ltd., Shanghai Lianggong Valve Factory Co., Ltd. and Wuhan Boiler Group Valve Co., Ltd.
Chief drafting staffs of this Standard: Wang Xiaojun, Lu Huancheng, Yang Heng, Lv Zhaozheng and Zhang Huidong.
The previous edition replaced by this Standard is as:
——GB/T 12234-1989.
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
中华人民共和国国家标准
GB/T 12234-2007
Bolted Bonnet Steel Gate Valves for the Petroleum and Natural Gas Industries
石油、天然气工业用螺柱连接阀盖的钢制闸阀
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.
Figure 1 Typical Construction of Gate Valve
4 Technical Specifications
4.1 Pressure/Temperature Ratings
4.1.1 The pressure/temperature ratings of gate valve shall be in accordance with those specified in GB/T 12224. As for those imposed by special soft seals or special trim materials, the pressure/temperature ratings are allowed to be less than those of the gate valve shell material. The lower value shall be adopted and marked on the valve identification plate.
4.1.2 Double-seated and sealed gate valves for low-temperature medium may be capable of trapping medium in the center cavity of the valve when in the closed position. If subjected to an increase in temperature, an excessive buildup of pressure may occur leading to a gate valve shell failure. Where such condition is possible, a pressure relief device shall be additionally provided in the center cavity of the valve, which shall be stated in the order contract.
Contents of GB/T 12234-2007
Foreword i
1 Scope
2 Normative References
3 Construction Type
4 Technical Specifications
5 Materials
6 Test Methods and Inspection Rules
7 Marking
8 Protection, Packaging, Storage and Transportation
Appendix A (Informative) Order Contract Data Sheet of Bolted Bonnet Steel Gate Valves for the Petroleum and Natural Gas Industries
