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Specification for power station valves
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Basic data
| Standard ID | GB/T 46814-2025 (GB/T46814-2025) |
| Description (Translated English) | Specification for power station valves |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J98 |
| Classification of International Standard | 27.060.30 |
| Word Count Estimation | 166,196 |
| Date of Issue | 2025-12-31 |
| Date of Implementation | 2026-07-01 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 46814-2025: Specification for power station valves
---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 27.060.30
CCSJ98
National Standards of the People's Republic of China
Power Plant Valve Technical Specifications
Published on 2025-12-31
Implemented on July 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 4.
4.Parameters and Models
5.Ordering Requirements 4
6 General Requirements 4
7 Pressure-Temperature Ratings 6
8 Design 8
9.Materials 35
10 manufactured 43
11 Inspection, Testing and Acceptance 47
12 Mark 59
13 Painting, packaging, supply and storage 61
14 Delivery Documents 62
15 Installation, Debugging and Maintenance 62
Appendix A (Normative) Method for Compiling Power Plant Valve Model Numbers 64
Appendix B (Informative) Valve Ordering Data Sheet 71
Appendix C (Normative) Unit Conversion 74
Appendix D (Normative) Pressure-Temperature Ratings for PN Series Valves 77
Appendix E (Normative) Class Series Valves Pressure-Temperature Ratings 87
Appendix F (Informative) Methods for determining pressure-temperature ratings and calculating intermediate interpolations 121
Appendix G (Informative) Parameter Specifications for Power Plant Boilers and Steam Turbines 128
Appendix H (Informative) Relationship between nominal dimensions and basic inner diameter of valve body end 131
Appendix I (Normative) Basic Formula for Determining Minimum Wall Thickness 133
Appendix J (Informative) Specifications for Welding Bevels of Valve Bodies 134
Appendix K (Informative) Coefficient of Thermal Expansion and Modulus of Elasticity of Metallic Materials 137
Appendix L (Informative) Allowable Stress of Materials 141
Appendix M (Normative) Temperature Limits of Pressure Component Materials 151
Appendix N (Informative) Materials, Hardness, and Welding Methods for Valve Sealing Surfaces 154
Appendix O (Informative) Material Identification Code 156
Appendix P (Informative) Metal Nameplates 157
Appendix Q (Informative) Valve Product Certificate of Conformity 159
References 160
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.
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 and is under the jurisdiction of the National Technical Committee on Standardization of Boilers and Pressure Vessels (SAC/TC262).
This document was drafted by. Wuhan Boiler Group Valve Co., Ltd., and Shanghai Power Equipment Complete Set Design and Research Institute Co., Ltd.
Harbin Power Station Valve Co., Ltd., Qingdao Power Station Valve Co., Ltd., Huaxia Valve Co., Ltd., and Hangzhou Huahui Valve Co., Ltd. of Harbin Electric Corporation
The company, China Special Equipment Inspection and Research Institute, Dongchen Intelligent Technology Co., Ltd., and Shanghai Yahe Valve Complete Equipment Co., Ltd.
The main drafters of this document are. Zhang Na, Jiao Zijie, Huang Xin, Zhang Han, Shi Huihui, Wan Shengjun, Xu Jiao, Liu Shizhong, Chen Xuefeng, Chen Lilong, and An Dong.
Wang Lihua, Huang Jun, Han Lina, Wang Yidong, Wang Ping.
Power Plant Valve Technical Specifications
1 Scope
This document specifies the parameters and models, ordering requirements, general requirements, pressure-temperature ratings, design, materials, manufacturing, and inspection of power plant valves.
Inspection, testing and acceptance, marking, painting, packaging, supply and storage, delivery documents, installation, commissioning and maintenance requirements.
This document applies to the design, manufacture, and acceptance of cast, forged, and welded valves with flanged, threaded, and welded connections, including gate valves.
Gate valves, plug valves, check valves, safety valves, relief valves, regulating valves, pressure reducing valves, desuperheating and pressure reducing valves, throttle valves, water supply distribution valves, drain valves, quick-start valves
Valves used in thermal power generating units, such as shut-off valves, butterfly valves, ball valves, circulating pump outlet valves, lockout valves, high-pressure heater three-way valves, and extraction steam non-return valves, have parameter ranges.
Enclosure.
a) Pressure rating less than or equal to PN800, maximum operating temperature less than or equal to 430℃;
b) Pressure ratings from Class 150 to Class 4500;
c) The working pressure is less than or equal to 38.5 MPa, and the maximum working temperature is less than or equal to 625℃;
d) The working pressure is less than or equal to 16MPa, and the maximum working temperature is less than or equal to 648℃.
Valves used in other steam parameter units, industrial boilers, waste heat boilers and other special equipment can be adopted with reference to this method.
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 (All Parts) Pressure Vessels
GB/T 152.4 Countersunk fasteners for hexagonal head bolts and hexagonal nuts
GB/T 196 Basic Dimensions of Ordinary Threads
GB/T 197 Tolerances for Standard Threads
GB/T 711 Hot-rolled steel plates and strips of high-quality carbon structural steel
GB/T 713.2 Steel plates and strips for pressure equipment – Part 2.Non-alloy and alloy steels with specified temperature properties
GB/T 713.7 Steel plates and strips for pressure equipment - Part 7.Stainless steel and heat-resistant steel
GB/T 1047 Definition and selection of nominal dimensions for piping components
GB/T 1184 Geometric Tolerances - No Tolerance Values Specified
GB/T 1220 Stainless Steel Bars
GB/T 1221 Heat-resistant steel bars
GB/T 1239.2 Technical conditions for cold-rolled cylindrical helical springs - Part 2.Compression springs
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without specified tolerances
GB/T 1972.1 Disc Springs - Part 1.Calculation
GB/T 1972.2 Disc Springs - Part 2.Technical Conditions
GB/T 2100 General purpose corrosion-resistant steel castings
GB/T 3077 Alloy Structural Steel
GB/T 4237 Hot-rolled stainless steel plates and strips
GB/T 4622 (all parts) Spiral wound gaskets for pipe flanges
...
