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GB/T 12236-2025: Steel swing check valve for petroleum, petrochemical and allied industries
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 12236-2025	English	459	Add to Cart	4 days [Need to translate]	Steel swing check valve for petroleum, petrochemical and allied industries
GB/T 12236-2008	English	299	Add to Cart	3 days [Need to translate]	Steel swing check valve for petroleum, petrochemical and allied industries
GB/T 12236-1989	English	359	Add to Cart	3 days [Need to translate]	General purpose industrial valves--Steel swing check valves

GB/T 12236-2025: Steel swing check valve for petroleum, petrochemical and allied industries

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23.060.50 CCSJ16 National Standards of the People's Republic of China Replaces GB/T 12236-2008 Steel swing check valves for petroleum, chemical and related industries Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 2 4.Structural Type 2 5 Technical Requirements 5.1 Pressure-Temperature Ratings 5 5.2 Structural Length 6 5.3 Connection Terminal 6 5.4 Valve body 7 5.5 Valve cover 10 5.6 Lifting device 10 5.7 Connection between valve body and valve cover 10 5.8 Connecting studs 10 between valve body and valve cover 5.9 Valve disc 11 5.10 Rocker arm and pin 11 5.11 Elastic sealing ring 11 5.12 Non-destructive testing 11 5.13 Evaporation Test 11 5.14 Pressure Test 11 6.Material 12 6.1 Valve body and valve cover 12 6.2 Valve seat 12 6.3 Valve disc 12 6.4 Rocker arm, bracket, and pin 12 6.5 Valve body and valve cover connecting stud 12 6.6 Screw plug 12 6.7 Nameplate 12 6.8 Bypass piping and bypass valves 12 6.9 Valve disc and valve seat sealing surface 12 6.10 Gasket 13 6.11 Corrosion resistance requirement 13 7.Test Methods 13 7.1 General Provisions 13 7.2 Pressure Test 14 7.3 Shell wall thickness measurement 14 7.4 Hardness measurement of sealing surface 14 7.5 Material Composition Analysis 14 7.6 Mechanical property test of valve body material 14 7.7 Valve body marking inspection 14 7.8 Nameplate Content Inspection 14 7.9 Evaporation Test 14 7.10 Non-destructive testing 14 8.Inspection Rule 14 8.1 Factory Inspection 14 8.2 Type Testing 15 9.Mark 15 10 Protection, Packaging, Transport and Storage 16 11 Ordering Requirements 16 Appendix A (Informative) Ordering Contract Data Sheet for Steel Swing Check Valves for Petroleum, Chemical and Related Industries 17 Figure 1.Schematic diagram of a typical structure of a flanged swing check valve. Figure 2.Typical structural diagram of a flanged swing check valve (full bore). 3 Figure 3.Schematic diagram of a typical structure of a flange-connected swing check valve with slow closing mechanism. Figure 4.Schematic diagram of a typical structure of a pressure self-tightening sealing swing check valve. Figure 5.Schematic diagram of a typical structure of a pressure self-tightening sealing oblique disc swing check valve. Figure 6.Schematic diagram of a typical structure of a pressure-self-tightening sealing Y-type swing check valve. Figure 7.Schematic diagram of a typical flange-connected split swing check valve. Table 1.Structural Length of Flange-Connected Split Swing Check Valve (6 mm) Table 2 Post-weld heat treatment of valve body and end flange welding 7 Table 3 Minimum wall thickness for valve body and valve cover 7 Table 4 Minimum Inner Diameter of Valve Seat 8 Table 5 Dimensions of the drain hole connector and drain hole boss 9 Table 6 Minimum diameter of fully threaded studs connecting valve body and valve cover (10mm) Table 7 Commonly Used Sealing Surface Materials 13 Table 8 Gaskets for Valve Covers 13 Table 9 Inspection Items 14 Table A.1 Ordering Contract Data for Steel Swing Check Valves for Petroleum, Chemical and Related Industries (Table 17)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document supersedes GB/T 12236-2008 "Steel Swing Check Valves for Petroleum, Chemical and Related Industries", and is consistent with GB/T 12236- Compared to.2008, aside from structural adjustments and editorial changes, the main technical changes are as follows. a) The applicable scope has been changed and weight requirements have been added (see Chapter 1, Chapter 1 of the.2008 edition); b) The term and definition of "split-type swing check valve" have been added (see 3.1); c) Added flanged swing check valves (full bore), pressure self-tightening seal swing check valves, and pressure self-tightening seal tilt-disc swing check valves. Typical structural diagrams of swing check valves, pressure self-tightening sealing Y-type swing check valves, and flange-connected split swing check valves. (See 4.2, 4.4~4.7); d) The structural length of the flange-connected split swing check valve has been increased (see 5.2); e) Increased technical requirements for flange connection ends (see 5.3.1); f) Post-weld heat treatment requirements for the welding of the valve body to the end flange have been added (see 5.4.3); g) An additional pound-class requirement has been added for the minimum inner diameter of the valve seat (see 5.4.5); h) Requirements for valve lifting devices have been added (see 5.6); i) The connection requirements between the valve body and the valve cover have been changed (see 5.7, 4.6 of the.2008 edition); j) The requirements for the connecting studs between the valve body and the valve cover have been changed (see 5.8, 4.7 of the.2008 edition); k) The requirements for the rocker arm and pin have been changed (see 5.10, 4.8.4 of the.2008 edition); l) The requirements for resilient sealing rings have been changed (see 5.11, 4.9 of the.2008 edition); m) Added non-destructive testing requirements (see 5.12); n) Added requirements for venting testing (see 5.13); o) Added pressure testing requirements (see 5.14); p) Requirements for bypass lines and bypass valves have been added (see 6.8); q) Increased corrosion resistance requirements for materials (see 6.11); r) The requirements for the test methods have been changed (see Chapter 7, Chapter 6 of the.2008 edition); s) The requirements for the inspection rules have been changed (see Chapter 8, 6.3 of the.2008 edition); t) The marking requirements on nameplates have been changed (see 9.3, 7.3 of the.2008 edition); u) Added ordering requirements (see Chapter 11). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee on Valve Standardization (SAC/TC188). This document was drafted by. Shanghai Liangong Valve Factory Co., Ltd., Hefei General Machinery Research Institute Co., Ltd., and Zhejiang Petrochemical Valve Co., Ltd. Company, Jiangsu Yifa Valve Co., Ltd., Southwest Pipeline Co., Ltd. of China Pipeline Network Group, Baoyi Group Co., Ltd., Shanghai Meike Valve Co., Ltd. Limited Liability Company, Lianggu Valve Group Co., Ltd., Shenjiang Valve Co., Ltd., Shanghai Special Equipment Supervision and Inspection Technology Research Institute, Chengdu Cheng Feng Valve Co., Ltd., Lixin Valve Group Co., Ltd., Hangzhou Chunjiang Valve Co., Ltd., and Henan Quanshun Fluid Control Technology Co., Ltd. Company, Hefei Tong'an Engineering Machinery Equipment Supervision Co., Ltd., Kaistone Valve Co., Ltd., Junpin Group Co., Ltd., Jinggong Valve Group Co., Ltd. The company, Hangzhou Special Equipment Inspection and Research Institute (Hangzhou Special Equipment Emergency Response Center), Sichuan Jingkong Valve Manufacturing Co., Ltd. Fangyuan Valve Group Co., Ltd., Shanghai Shengjiang Machinery Equipment Co., Ltd., Jiangsu Jiangyuan Machinery Co., Ltd., Jiangsu Mingtongfulu Fluid Control Equipment Co., Ltd., Yancheng Aokaimingtong Valve Co., Ltd., Jiangsu Tenglong Petrochemical Machinery Co., Ltd., Lanzhou High Pressure Valve Co., Ltd., Yuanda Valve Group Co., Ltd., Anhui Tunxi High Pressure Valve Co., Ltd., Xuanda Industrial Group Co., Ltd., and Weiduli Valve Co., Ltd. Jinan Maike Valve Technology Co., Ltd., Sichuan Feiqiu (Group) Co., Ltd., Zhejiang Ruitong Valve Co., Ltd., and Shuangda Valve Co., Ltd. Limited Liability Company, Xingwei Valve Group Co., Ltd., Zhongfa Holding (Group) Co., Ltd., Shandong Weima Fluid Control System Co., Ltd., Guogong Holding Group Co., Ltd., Taigang Alloy (Zhongshan) Co., Ltd., Hangda Valve Group Co., Ltd., Zhejiang Aodehua Technology Co., Ltd., Suzhou Cody Fluid Control Equipment Co., Ltd. The main drafters of this document are. Yang Heng, Ming You, Xiang Guangwu, Qian Yufeng, Gu Li, Zou Li, Zhang Xiaozhong, Kang Shiping, Pan Yuanbo, Xia Ji, and Ye Jihan. Fu Minghai, Liu Zili, Pan Daode, Chai Weimin, Zhang Xufeng, Ma Xiangfeng, Yang Yuemiao, Lin Jiuliang, Yang Jie, Chen Tao, Huang Gang, Kang Zhaozhong, Ye Liquan Han Xinlin, Yang Yang, Ding Xuefeng, Dai Yiming, Chen Wenxin, Liu Xiujie, Wang Fei, Ye Qunce, Xia Chongmao, Huang Yonghong, Zhu Yongping, Zhu Huafeng, Ge Shaoce, Wang Jianhe, Chen Xing, Zhang Mingming, Yu Jinli, Sun Zhibiao, Jiang Zhenguang, Wu Ganghui, and Zha Zhengzhi. This document was first published in 1989, revised for the first time in.2008, and this is the second revision. Steel swing check valves for petroleum, chemical and related industries

1 Scope

This document specifies the structural type, technical requirements, materials, test methods, inspection rules, marking and protection, and packaging of steel swing check valves. Loading, transporting and storing. This document applies to nominal sizes DN50~DN1200 and nominal pressures PN16~PN400, and nominal sizes NPS2~NPS48 and... Nominal pressure Class 150~Class 2500, applicable temperature -29℃~550℃, applicable media include petroleum, chemical, natural gas and related products. Design, production and inspection of steel swing check valves with bolted valve covers, pressure self-tightening sealing valve covers, end flange connections or welding.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 150.3 Pressure Vessels - Part 3.Design GB/T 150.4 Pressure Vessels - Part 4.Manufacturing, Inspection and Acceptance GB/T 196 Basic Dimensions of Ordinary Threads GB/T 197 Tolerances for Standard Threads GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature GB/T 6175 Type 2 Hex Nut GB/T 9124 (all parts) Steel pipe flanges GB/T 12220 Industrial Valve Marking GB/T 12221 Structural Length of Metal Valves GB/T 12224 General requirements for steel valves GB/T 12228 Technical Specification for Carbon Steel Forgings of General Valves GB/T 12229 Technical Specification for Carbon Steel Castings of General Valves GB/T 12230 Technical Requirements for Stainless Steel Castings for General Valves GB/T 26480 Inspection and Testing of Valves GB/T 26481 Emission test for industrial valves GB/T 40079 Classification and Qualification Procedures for Valve Emission Tests HG/T 20592 Steel Pipe Flanges (PN Series) HG/T 20615 Steel Pipe Flanges (Class Series) JB/T 106 Marking and Painting of Valves JB/T 7927 Appearance Quality Requirements for Cast Steel Valve Parts NB/T 47013.2 Non-destructive testing of pressure equipment - Part 2.Radiographic testing NB/T 47013.3 Non-destructive testing of pressure equipment - Part 3.Ultrasonic testing NB/T 47013.4 Non-destructive testing of pressure equipment - Part 4.Magnetic particle testing NB/T 47013.5 Non-destructive testing of pressure equipment - Part 5.Penetrant testing SY/T 0599 Technical Specification for Metallic Materials for Natural Gas Surface Facilities Resisting Sulfide Stress Cracking and Stress Corrosion Cracking ...