Detail of GB/T 12237-2007

Introduction of GB/T 12237-2007

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 corresponding to but not equivalent to ISO 17292:2004 Metal Ball Valves for Petroleum, Petrochemical and Allied Industries and API 608-2002 Metal Ball Valves-Flanged, Threaded and Welding Ends. Compared with ISO 17292:2004/API 608-2002, there is a very large difference in the main technical contents and the standard text structure. This standard is revised from GB/T 12237-1989 "General Purpose Industrial Valves-Flanged and Butt-weld End Steel Ball Valves". Compared with GB/T 12237-1989, the main changes are as follows --The standard name is modified --The application scope is enlarged --The temperature-pressure rating value of PTFE valve seat is added, and a limit explanation is made to the temperature-pressure rating value of the seals of nonmetallic valve seat for ball valve; --The requirements for hole diameter and hole depth of DN8~DN50 socket weld ends are added, and the requirements for the wall thickness at the socket weld connection end and threaded connection end are added; --The requirements for the minimum diameter of valve seat are added; --The technical requirements for dimension and performance of connecting bolts between valve bodies are added; --The material requirements are modified; --The requirements for the hardness of connecting bolt for valve body and valve cover and of valve stem material; --The test methods and inspection requirements are modified, and the type test content is added; --The marking requirements are modified; --The supply requirements are modified; --Appendix A Order Contract Data Sheet is added. This standard shall replace GB/T 12237-1989 from the implementation date. Appendix A of this standard is informative. This standard is 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, Shanghai Neles-Jamesbury Valve Co., Ltd., Neway Valve (Suzhou) Co., Ltd. and Zhejiang Shenjiang Valve Co., Ltd. Chief drafting staff of this standard: Wang Xiaojun, Wu Youqing, Gao Kaike and Ye Xueqiang The previous edition of the standard replaced by this standard is as: --GB /T 12237-1989 Steel Ball Valves for Petroleum, Petrochemical and Allied Industries 石油、石化及相关工业用的钢制球阀 1 Scope This Standard specifies the structure types, technical requirements, materials, test methods and inspection rules, marking, packaging, storage and transportation for the steel ball valves for petroleum, petrochemical and allied industries. This Standard applies for the steel valves with nominal pressure PNl6~PNl00, nominal dimension DN15~DN500, and end connection in the form of flanges and welding; and for the steel valves with nominal PNl6~PNl40, nominal dimension DN8~DN50, and end connection in the form of thread and welding. 2 Normative References The terms of the following documents are available in the provisions of this Standard due to references. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard, however, all the parties reaching an agreement under this Standard are encouraged to study the availability of the latest version of these documents. For undated references, the latest version applies to this Standard. GB 150 Steel Pressure Vessels GB/T 152.4 Fastener Countersinks for Hexagon Bolts and Nuts GB/T 196 Basic Dimensions for General Threads (GB/T 196-2003, ISO 724: 1993, MOD) GB/T 197 Common Thread Tolerance (GB/T 197-2003, ISO 965-1: 1998, MOD) GB/T 228 Metallic Materials Tensile Test Method in Room Temperature (GB/T 228-2002, eqv ISO 6892:1998) GB/T 7306.2 55º Sealing Pipe Thread - Part 2: Taper Internal Thread and Taper External Thread (GB/T 7306.2-2000, eqv ISO 7-1: 1994) GB/T 9113 (For All Parts), Overall Steel Pipe Flanges GB/T 9124 Technical Provisions for Steel Pipe Flanges GB/T 12220 Logo for General Valves (GB/T 12220-1989, idt ISO 5209:1977) GB/T 12221 Metal Valve Structure Length (GB/T 12221-2005, ISO 5752: 1982, MOD) GB/T 12223 Connection of Some Rotary Valve Actuators (GB/T 12223-2005, ISO 5211:1991, MOD) GB/T 12224 General Requirements for Steel Valves (GB/T 12224-2005, ASTM B16.34a: 1998, NEQ) GB/T 12228 Technical Provisions for General Valve Carbon Steel Forgings GB/T 12229 Technical Provisions for General Valve Carbon Steel Castings GB/T 12230 General Valve Stainless Steel Castings JB/T 106 Logo and Painting for Valves JB/T 6440 Radiographic Examination for Compressed Castings of Valves JB/T 9092 inspection and Test for Valves 3 Terms and Definitions The following terms and definitions are available to this Standard. 3.1 Anti-Static Design It refers to the structure capable of conducting electricity among body, ball and stem. 3.2 Fire Type Design It refers to the structure capable of keeping the certain sealing performance even if the soft seal is burned. 4 Structure Type 4.1 The typical structure of floating ball valve (one-piece type) is shown in Figure 1. 4.2 The typical structure of floating ball valve (two-piece type) is shown in Figure 2. 4.3 The typical structure of fixed ball valve is shown in Figure 3. Nut Packing restrainer Grand Gland packing Washer Thrust washer Stem Seat gland Seat Ball Body Figure 1 Typical Structure of Floating Ball Valve (One-Piece Type) Bolt Handle Stop block Screw Packing bushing Packing Packing restrainer Right body Thrust washer Stem Ball Seat Left body Washer Screw Nut Figure 2 Typical Structure of Floating Ball Valve (Two-Piece Type) Key Connecting plate Hanging ring Bolt Bolt Packing holder Thrust washer Stem Seat Seat holder Washer Washer Connector Stud Nut Body Bracket Fixed axle Bolt Figure 3 Typical Structure of Fixed Ball Valve 5 Technical Requirements 5.1 Pressure-Temperature Rating 5.1.1 Pressure-Temperature Rating for Ball Valve Housing The pressure-temperature rating for ball valve housing is subject to the requirements of GB/T 12224. 5.1.2 Pressure-Temperature Rating for Ball Valve Seat and Seal Components 5.1.2.1 Due to the limits for the pressure-temperature rating for ball valve seat, seal components and other non-metallic materials, the pressure-temperature rating permissible by ball valve may be limited. The pressure-temperature rating for ball valve seat, seal components and other non-metallic materials should be expressly provided on the nameplate, and be no higher than the pressure-temperature rating for ball valve housing. 5.1.2 If the Teflon or PTFE is available for the materials of ball valve seat and seal components, the maximum allowable working pressure-temperature rating for ball valve seat and seal components should be subject to Table 1.

Contents of GB/T 12237-2007