Path: Home > GB/T > Page725 > GB/T 12235-2025

Price & Delivery

US$519.00 · In stock · Download in 9 seconds
GB/T 12235-2025: Steel globe valves and lift check valve for petroleum, petrochemical and allied industries
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Valid

Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 12235-2025	English	519	Add to Cart	5 days [Need to translate]	Steel globe valves and lift check valve for petroleum, petrochemical and allied industries
GB/T 12235-2007	English	275	Add to Cart	0--9 seconds. Auto-delivery	Steel globe valves and lift check valve for petroleum, petrochemical and allied industries [including MODIFICATION 1]
GB/T 12235-1989	English	479	Add to Cart	4 days [Need to translate]	General purpose industrial valves--Flanged steel globe valves and lift check valves

GB/T 12235-2025: Steel globe valves and lift 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 12235-2007 Steel gate valves for petroleum, petrochemical and related industries and lift check valve aliedindustries 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 6 5.1 Pressure-Temperature Ratings 6 5.2 Structural Length 6 5.3 Connection Terminal 7 5.4 Valve body 7 5.5 Valve cover 8 5.6 Connection between valve body and valve cover 11 5.7 Connecting studs 11 between valve body and valve cover 5.8 Valve disc 11 5.9 Valve stem and valve stem nut 12 5.10 Packing and stuffing box 13 5.11 Valve opening and closing operation 13 5.12 Static pressure life 13 5.13 Non-destructive testing 14 5.14 Pressure Test 14 5.15 Emission Test 14 6.Material 14 6.1 Valve Material 14 6.2 Valve stem 15 6.3 Sealing Pair Material 15 6.4 Corrosion resistance requirement 15 6.5 Valve body and valve cover connection gasket 16 7.Test Methods 16 7.1 General Provisions 16 7.2 Pressure Test 16 7.3 Shell wall thickness measurement 16 7.4 Valve stem diameter measurement 16 7.5 Hardness measurement of sealing surface 16 7.6 Valve stem hardness measurement 16 7.7 Material Composition Analysis 16 7.8 Mechanical property test of valve body material 17 7.9 Evaporation Test 17 7.10 Static pressure life test 17 7.11 Valve body marking inspection 17 7.12 Nameplate Content Inspection 17 7.13 Non-destructive testing 17 8.Inspection Rule 17 8.1 Factory Inspection 17 8.2 Type Testing 18 9.Mark 18 10 Packaging, transportation and storage 19 11 Ordering Requirements 19 Appendix A (Informative) Ordering Contract Data Sheet for Steel Gate Valves and Lift Check Valves for Petroleum, Petrochemical and Related Industries 20 References 21 Figure 1.Schematic diagram of a bolted-connected valve cover straight-through gate valve. Figure 2.Schematic diagram of bolt-connected valve cover angle gate valve. 3 Figure 3.Schematic diagram of the Y-shaped gate valve with bolted connection to the valve cover. 4 Figure 4.Schematic diagram of a bolt-connected valve cover lifting check valve. Figure 5.Schematic diagram of the bolted valve cover shut-off check valve structure. Figure 6.Schematic diagram of the structure of a pressure self-tightening sealing valve cover stop valve. Table 1 Post-weld heat treatment of valve body and end flange welding 7 Table 2 Minimum wall thickness for valve body and valve cover 7 Table 3 Minimum Inner Diameter of Valve Body and Seat 8 Table 4 Minimum wall thickness of valve stem stuffing box portion of valve cover (10) Table 5 Minimum diameter of double-ended studs connecting valve body and valve cover (11mm) Table 6 Minimum stem diameter 12 Table 7.Static pressure life cycles of gate valves (13) Table 8 Parts Material 14 Table 9 Valve Stem Material 15 Table 10 Sealing Surface Overlay Material 15 Table 11 Gaskets for Valve Body and Valve Cover Connection 16 Table 12 Inspection Items 17 Table A.1 Ordering Contract Data for Steel Gate Valves and Lift Check Valves for Petroleum, Petrochemical and Related Industries 20

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 12235-2007 "Steel gate valves and lift check valves for petroleum, petrochemical and related industries", and is consistent with... Compared with GB/T 12235-2007, apart from structural adjustments and editorial changes, the main technical changes are as follows. a) The scope of application has been changed and weight requirements have been added (see Chapter 1, Chapter 1 of the.2007 edition); b) The schematic diagram of the shut-off check valve has been modified (see 4.5, 3.5 in the.2007 version), and a pressure-tightening sealing valve cover shut-off valve has been added. Structural diagram (see 4.6); c) The flange connection requirements have been changed (see 5.3.1, 4.3.1 in the.2007 edition); d) The heat treatment requirements after welding the valve body to the end flange have been added (see 5.4.3); e) The minimum wall thickness requirement for the valve body has been changed (see 5.4.4, 5.4.5, and 4.4.4, 4.4.5 in the.2007 edition); f) The minimum inner diameter requirement for the valve body and seat has been changed (see 5.4.6, 4.4.6 in the.2007 edition); g) The valve body flow path requirements have been changed (see 5.4.7, 4.4.7 in the.2007 version); h) Valve seat requirements have been changed (see 5.4.8, 5.4.9, and 4.4.8 and 4.4.9 in the.2007 edition); i) The requirements for the vent have been changed (see 5.4.11, 4.4.11 in the.2007 edition); j) The exception case where the upper sealing seat is installed on the valve cover structure has been removed (see 4.5.3 in the.2007 edition); k) The connection requirements between the valve body and the valve cover have been changed (see 5.6, 4.6 in the.2007 edition); l) The requirements for the connecting studs between the valve body and the valve cover have been changed (see 5.7, 4.7 in the.2007 edition); m) The valve disc requirements have been changed (see 5.8, 4.8 in the.2007 edition); n) The minimum valve stem diameter requirement has been changed (see 5.9.2, 4.9.2 in the.2007 version); o) The requirements for the inner diameter of the stuffing box orifice have been changed (see 5.10.2, 4.10.3 in the.2007 edition); p) The requirements for bypass devices and venting devices have been removed (see 4.12 of the.2007 edition); q) The requirements for non-destructive testing have been changed (see 5.13, 4.14 in the.2007 version); r) Added requirements for venting testing (see 5.15); s) The valve body material requirements have been changed (see 6.1, 4.4.1 of the.2007 edition); t) The hardness requirements for valve stem materials have been changed (see 6.2, 5.5 in the.2007 edition); u) The requirements for the surfacing material of the sealing surface have been changed (see 6.3, 5.4 of the.2007 edition); v) 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. Hefei General Machinery Research Institute Co., Ltd., Shenjiang Valve Co., Ltd., and Zhejiang Special Equipment Research Institute. Chengdu Chengfeng Valve Co., Ltd., Jiangsu Yifa Co., Ltd., Lanzhou High Pressure Valve Co., Ltd., Fujian Gulei Petrochemical Co., Ltd. Zhejiang Petrochemical Valve Co., Ltd., Shanghai Meike Valve Co., Ltd., Dalian Dagao Valve Co., Ltd., and Southwest Pipeline of China Pipeline Group. Limited Liability Company, Baoyi Group Co., Ltd., Hangzhou Special Equipment Inspection and Research Institute (Hangzhou Special Equipment Emergency Response Center) Jiangsu Tenglong Petrochemical Machinery Co., Ltd., Yancheng Aokaimingtong Valve Co., Ltd., Jiangsu Mingtongfulu Fluid Control Equipment Co., Ltd., Jiangsu Jiangyuan Machinery Co., Ltd., Yuanda Valve Group Co., Ltd., Hefei Tong'an Engineering Machinery Equipment Supervision Co., Ltd., Zhejiang Linuo Fluid Control Technology Co., Ltd., Hubei Taihe Petrochemical Equipment Co., Ltd., Anhui Baihu Valve Factory Co., Ltd., Anhui Tunxi High Pressure Valve Co., Ltd. Door Co., Ltd., Xuanda Industrial Group Co., Ltd., Jiangsu Yuanyang Valve Intelligent Control Co., Ltd., Yangquan Valve Co., Ltd. Beijing Valve General Factory Co., Ltd., Sichuan Jingkong Valve Manufacturing Co., Ltd., Lixin Valve Group Co., Ltd., and Shuangheng Valve Group Co., Ltd. Limited Liability Company, Shanghai Ya'ao Valve Co., Ltd., Lianggu Valve Group Co., Ltd., Sichuan Feiqiu (Group) Co., Ltd., Taigang Alloy (Zhongshan) Co., Ltd., Hangzhou Chunjiang Valve Co., Ltd., Kaiweixi Valve Group Co., Ltd., Zhongfa Holding (Group) Co., Ltd., Jinbo Valve Door Group Co., Ltd., Tianjin Baili Zhanfa Group Co., Ltd., Jinan Maike Valve Technology Co., Ltd., and Guogong Holding Group Co., Ltd. Company, Keston Valve Co., Ltd., Junpin Group Co., Ltd., Jinggong Valve Group Co., Ltd., Suzhou Penghan Valve Co., Ltd., Shanghai Feng Lei Valve Group Co., Ltd., Anhui Jinda Instrument Co., Ltd., Oulam Valve Technology Co., Ltd., Shuangda Valve Co., Ltd., Xingwei Valve Group Co., Ltd., Shandong Weima Fluid Control System Co., Ltd., Beike Valve Group Co., Ltd., Shanghai Shuanggao Valve (Group) Co., Ltd. Limited Liability Company, Viduli Valve Co., Ltd., Hefei Valve Co., Ltd., Sichuan Zhongyou Leyi Energy Equipment Manufacturing Co., Ltd., Leshan Hengli Valve Co., Ltd., Euro-Electric Valve Group Co., Ltd., Chengdu Huake Valve Manufacturing Co., Ltd., Tanggong Valve Group Co., Ltd., Zhejiang Fangton Instrument Valve Co., Ltd., Changzhou Kaipeng Hydraulic Equipment Co., Ltd., Hangzhou Kaiwei Valve Group Co., Ltd., Zhejiang Jida Special Valve Limited Liability Company, Servis Pump & Valve Manufacturing (Zhejiang) Co., Ltd., Dongying Huachen Petroleum Equipment Co., Ltd. The main drafters of this document are. Wang Xiaojun, Ye Jihan, Xu Huiting, Tong Jun, Qian Yufeng, Hao Hongda, Yang Kunsong, Li Yongxi, Zhao Yong, and Zhang Jianbin. Kang Shiping, Wang Shuai, Zhang Xiaozhong, Wang Fei, Dai Yiming, Ding Xuefeng, Zhou Yong, Zang Hongwei, Wang Baorui, Ma Xiangfeng, Lu Zhengyuan, Zhang Wenzhong, Huang Jie Wu Zhijun, Wang Qiang, Yang Zhiyuan, Jin Liming, Dong Fei, Peng Xiucheng, Chen Hao, Chen Xinyang, Lan Yongjun, Zhu Keling, Chen Chao, Sun Zhibiao, Lu Yuanhang Lin Wenli, Chen Xing, Ma Lei, Hong Chunlong, Huang Yonghong, Jing Dongyang, Zhou Weijian, Tang Yubo, Wang Xuepeng, Chen Jian, Guo Jianwu, Cheng Mingxiang, Jin Zhiyuan Ge Shaoce, Wang Lijun, Zhang Mingming, Zhong Xingwang, Li Li, Xia Chongmao, Jin Jinquan, Peng Guojun, Hu Zhipeng, Zheng Yinfeng, Bao Qiaoling, Chen Yonggang, Zhang Jin Wu Peng, Zhuo Yuqi, Ying Huaming, Zhu Yonghui, Liu Zhibo. This document was first published in 1989, revised for the first time in.2007, and this is the second revision. Steel gate valves for petroleum, petrochemical and related industries and lift check valve

1 Scope

This document specifies the structural types, technical requirements, materials, and testing procedures for steel gate valves and lift check valves used in the petroleum, petrochemical, and related industries. Methods, inspection rules, marking and packaging, transportation and storage. This document applies to nominal sizes DN15~DN600 and nominal pressures PN16~PN400, and nominal sizes NPS⅟~NPS24 and... Steel gate valve with nominal pressure Class 150~Class 2500, applicable temperature -46℃~550℃, and end connection type of flange or welded. Design, production, and inspection of lift check valves. Throttling valves are for reference only.

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 152.4 Countersunk fasteners for hexagonal head bolts and hexagonal nuts GB/T 196 Basic Dimensions of Ordinary Threads GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature GB/T 229 Metallic materials Charpy impact test method GB/T 5796 (all parts) Trapezoidal Thread GB/T 9124 (all parts) Steel pipe flanges GB/T 12220 Industrial Valve Marking GB/T 12221 Structural Length of Metal Valves GB/T 12222 Connection of multi-turn valve actuators GB/T 12224 General requirements for steel 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 6440 Radiographic Inspection of Pressure Cast Steel Valves JB/T 8859 Test Procedure for Static Pressure Life of Gate Valves 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 Resistant to Sulfide Stress Cracking and Stress Corrosion Cracking ...