Standard No.:	GB/T 12235-2025
English Name:	Steel globe valves and lift check valve for petroleum;petrochemical and allied industries
Chinese Name:	石油、石化及相关工业用钢制截止阀和升降式止回阀
Chinese Classification:	J16    Valve
Professional Classification:	GB    National Standard
ICS Classification:	23.060.50 23.060.50    Check valves 23.060.50
Source Content Issued by:	SAMR, SAC
Issued on:	2025-10-31
Implemented on:	2026-5-1
Status:	to be valid
Superseding:	GB/T 12235-2007 Steel globe valves and lift check valve for petroleum petrochemical and allied industries
Target Language:	English
File Format:	PDF
Word Count:	13500 words
Translation Price(USD):	405.0
Delivery:	via email in 1~5 business day

GB/T 12235-2025 Steel globe valves and lift check valve for petroleum;petrochemical and allied industries English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS 13.220.10 CCS H 57 National Standard of the People's Republic of China ‌GB/T 12235-2025 Replaces GB/T 12235-2007 Steel globe valves and lift check valve for petroleum;petrochemical and allied industries 石油、石化及相关工业用钢制截止阀和升降式止回阀 Issue date: 2025-10-31 Implementation date: 2026-05-01 Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China the Standardization Administration of the People's Republic of China Contents Foreword 1 Scope 2 Normative References 3 Terms and Definitions 4 Structural Types 5 Technical Requirements 5.1 Pressure-Temperature Ratings 5.2 Face-to-Face Dimensions 5.3 Ends 5.4 Valve Body 5.5 Bonnet 5.6 Connection Between Valve Body and Bonnet 5.7 Bolting Between Valve Body and Bonnet 5.8 Disc 5.9 Stem and Stem Nut 5.10 Packing and Stuffing Box 5.11 Valve Operation 5.12 Static Pressure Life 5.13 Non-Destructive Testing 5.14 Pressure Testing 5.15 Fugitive Emission Testing 6 Materials 6.1 Valve Materials 6.2 Stem 6.3 Sealing Pair Materials 6.4 Corrosion Resistance Requirements 6.5 Gasket Between Valve Body and Bonnet 7 Test Methods 7.1 General 7.2 Pressure Testing 7.3 Shell Wall Thickness Measurement 7.4 Stem Diameter Measurement 7.5 Sealing Face Hardness Measurement 7.6 Stem Hardness Measurement 7.7 Material Composition Analysis 7.8 Mechanical Property Testing of Valve Body Material 7.9 Fugitive Emission Testing 7.10 Static Pressure Life Testing 7.11 Valve Body Marking Inspection 7.12 Nameplate Content Inspection 7.13 Non-Destructive Testing 8 Inspection Rules 8.1 Factory Inspection 8.2 Type Test 9 Marking 10 Packaging, Transportation and Storage 11 Ordering Requirements Appendix A (Informative) Order Contract Data Sheet for Steel Globe Valves and Lift Check Valves for Petroleum, Petrochemical and Related Industries References 1 Scope‌ This document specifies the structural types, technical requirements, materials, test methods, inspection rules, marking, packaging, transportation, and storage of steel globe valves and lift check valves for petroleum, petrochemical, and related industries. This document applies to the design, production, and inspection of steel globe valves and lift check valves with nominal sizes DN15 to DN600 and nominal pressures PN16 to PN400, or nominal sizes NPS½ to NPS24 and nominal pressures Class150 to Class2500. The applicable temperature range is -46°C to 550°C. The end connection types are flanged or welding. Throttle valves may refer to this document for use. ‌2 Normative References‌ The provisions of the following documents constitute essential clauses of this document through normative references in the text. For dated references, only the version published on the cited date applies. For undated references, the latest version (including all amendments) applies. GB/T 150.3 Pressure vessels - Part 3: Design GB/T 150.4 Pressure vessels - Part 4: Manufacture, inspection and acceptance GB/T 152.4 Fasteners - Countersunk head bolts and hexagon nuts - Countersunk holes GB/T 196 General purpose metric screw threads - Basic dimensions GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature GB/T 229 Metallic materials - Charpy pendulum impact test GB/T 5796 (all parts) Trapezoidal threads GB/T 9124 (all parts) Steel pipe flanges GB/T 12220 Industrial valves - Marking GB/T 12221 Metallic valves - Face-to-face dimensions GB/T 12222 Multi-turn valve actuator attachments GB/T 12224 Steel valves - General requirements GB/T 26480 Valves - Inspection and testing GB/T 26481 Industrial valves - Fugitive emission testing GB/T 40079 Valve fugitive emission testing - Classification and qualification procedures HG/T 20592 Steel pipe flanges (PN series) HG/T 20615 Steel pipe flanges (Class series) JB/T 106 Marking and painting for valves JB/T 6440 Radiographic inspection of pressure-bearing steel castings for valves JB/T 8859 Globe valves - Test procedure for static pressure life 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 sulfide stress cracking and stress corrosion cracking resistant metallic materials for natural gas surface facilities ‌3 Terms and Definitions‌ This document does not require the definition of terms and definitions. ‌4 Structural Types‌ 4.1 The typical structural type of a bolted bonnet straight-through globe valve is shown in Figure 1. ‌5 Technical Requirements‌ 5.1 Pressure-Temperature Ratings 5.1.1 The pressure-temperature ratings of the valve shell shall comply with GB/T 12224. ‌5.2 Face-to-face Dimensions‌ 5.2.1 The face-to-face dimensions of the globe valve shall comply with GB/T 12221 or as required in the order contract. 5.2.2 The face-to-face dimensions of lift check valves and stop check valves shall be the same as the globe valves with the same nominal pressure and nominal size. ‌5.3 Ends‌ 5.3.1 Flanged ends shall comply with GB/T 9124 (all parts), HG/T 20592, HG/T 20615, or as required in the order contract. 5.3.2 The dimensions of welding ends shall comply with GB/T 12224 or as required in the order contract. ‌5.4 Valve Body‌ 5.4.1 The valve body shall be manufactured by casting or forging. 5.4.2 The valve body with a cast flange connection end shall not be converted into a welding end by removing the flange end. 5.4.3 When the valve body is welded to the end flange, the end flange shall be a forged flange with a butt weld. The welding shall comply with the provisions of GB/T 150.4. The backing rings used for auxiliary welding shall be removed after welding. The post-weld heat treatment shall comply with the requirements specified in Table 1. ‌Table 1‌ Post-weld heat treatment for welded connection between valve body and end flange. 5.4.7 The flow passage design of the valve body should minimize the impact of fluid flow erosion on the valve body. 5.4.8 When the valve body seat sealing surface requires alloy or hard alloy materials, it is advisable to surface weld on a separate seat ring made of the same material as the valve body. The thickness of the surfaced layer after machining shall not be less than 2 mm (excluding the transition layer). If specified in the order contract, the seat sealing surface made of austenitic stainless steel material may be directly machined on the valve body. 5.4.9 The seat ring may be fixed to the valve body by threaded or welded connections. When assembling the seat with the valve body, light lubricating oil with a viscosity no greater than kerosene may be used; sealant shall not be used. The inner and outer diameters of the seat sealing surface shall be chamfered or rounded. 5.4.10 For valves with a nominal size of DN200 (NPS8) or larger, a guiding mechanism for the disc's lifting movement shall be provided on either the valve body or the seat. 5.4.11 If specified in the order contract, a vent hole may be provided on the valve body for valves with a nominal size of DN50 (NPS2) or larger. The vent hole shall comply with the provisions of GB/T 12224. 5.4.12 Except for the flanges and other parts of the valve body, no nameplate fixing pins shall be driven in the pressure-bearing area of the valve body. 5.5 Bonnet 5.5.1 The bonnet shall be manufactured by casting or forging. 5.5.2 The minimum wall thickness (tm) of the bonnet in the area subjected to medium pressure, except for the stuffing box area and the extended neck of the stem, shall comply with the requirements of Table 2. The areas with stress concentration shall be thickened. 5.5.3 The bonnet and the yoke may be integral or separately connected. When separately connected, the yoke shall be bolted or studded to the bonnet. The mating surfaces shall have a guiding fit to ensure the concentricity between the yoke and the bonnet stuffing box hole. The bolts or studs shall have sufficient strength to ensure that under the maximum operating load, there is no situation that affects the operation and sealing of the valve.