GB/T 12244-2025 PDF English
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GB/T 12244: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 12244-2025 | 140 | Add to Cart | Auto, 9 seconds. | Pressure reducing valves - General requirements | Valid |
| GB/T 12244-2006 | 209 | Add to Cart | 3 days | General requirements for pressure reducing valves | Valid |
| GB/T 12244-1989 | 199 | Add to Cart | 2 days | General specification for pressure reducing valves | Obsolete |
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GB/T 12244-2025: Pressure reducing valves - General requirements
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12244-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.060.99 CCS J 16 GB/T 12244-2025 Replacing GB/T 12244-2006 Pressure reducing valves - General requirements Issued on: OCTOBER 05, 2025 Implemented on: MAY 01, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Technical requirements... 7 4.1 Pressure-temperature ratings... 7 4.2 Materials... 8 4.3 General requirements... 8 4.4 Performance requirements... 9 5 Test methods... 10 6 Inspection rules... 10 6.1 Factory-exit inspection... 10 6.2 Type test... 10 7 Marking... 11 7.1 Marking content... 11 7.2 Markings on the valve body... 11 7.3 Markings on the nameplate... 11 8 Packaging and storage... 12Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020 “Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents”. This document replaces GB/T 12244-2006 “General requirements for pressure reducing valves”. Compared with GB/T 12244-2006, in addition to structural adjustments and editorial modifications, the main technical changes are as follows. a) MODIFY the scope of application for pressure reducing valves (see Clause 1 of this document; Clause 1 of the 2006 edition); b) DELETE the term “direct-acting reducing valve” and its definition, and ADD the term “pressure raise value from dynamic to static after valve” and its definition (see Clause 3 of this document; Clause 3 of the 2006 edition); c) DELETE the ordering requirements (see Clause 4 of the 2006 edition); d) ADD the requirements for the pressure-temperature ratings of cast copper pressure reducing valves (see 4.1 of this document); e) ADD the requirements for the material of copper valves (see 4.2 of this document); f) ADD the requirements for flange connection dimensions and sealing face shape and dimensions of copper valves (see 4.3.8 of this document); g) ADD the requirements for shell wall thickness (see 4.3.9 of this document); h) ADD the requirements for non-destructive testing (see 4.3.10 of this document); i) ADD the requirements for shell strength (see 4.4.1 of this document); j) ADD the requirements for flow rate (see 4.4.3 of this document); k) MODIFY the requirements for flow characteristics (see 4.4.4 of this document; 5.4.2 in the 2006 edition); l) MODIFY the requirements for pressure characteristics (see 4.4.5 of this document; 5.4.3 in the 2006 edition); m) MODIFY the requirements for sealing performance (see 4.4.6 of this document; 5.4.4 in the 2006 edition); n) ADD the requirements for pressure raise value from dynamic to static after valve (see 4.4.8 of this document); Pressure reducing valves - General requirements1 Scope
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, and storage and transportation of pressure reducing valves. This document applies to pressure reducing valves with nominal dimensions of DN15 ~ DN1200 and nominal pressures of PN6 ~ PN160, used in pipelines for media such as gas, steam, or water.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 1047 Pipework components - Definition and selection of nominal size GB/T 1048 Pipework components - Definition and selection of nominal pressure GB/T 1176 Casting copper and copper alloys GB/T 9124.1 Steel pipe flanges - Part 1.PN designated GB/T 12220 Industrial valves - Marking GB/T 12224 General requirements for industrial steel valves GB/T 12225 General purpose industrial valves - Specification of copper alloy castings GB/T 12226 General purpose industrial valves - Technical specification for gray iron castings GB/T 12227 General purpose industrial valves - Technical specification for ductile iron castings GB/T 12228 General purpose industrial valves - Technical specification for carbon steel forgings GB/T 12229 General purpose Industrial valves - Technical specification for carbon steel castings GB/T 12230 General purpose industrial valves - Specification of stainless steel castings GB/T 12245 Methods of performance test for pressure reducing valves GB/T 13819 Copper and copper alloy castings GB/T 15530.1 Cast copper alloy integral flanges GB/T 15530.8 Specifications for copper alloy and composite flanges GB/T 17241.1 Cast iron pipe flanges - Part 1.PN designated GB/T 21465 Terminology for valves GB/T 26640 Specification for minimal thickness of the shell of valves GB/T 32808 Valves - Model designation method JB/T 106 Valves marking and coating JB/T 2205 Reducing pressure valve - Face-to-face dimensions JB/T 7928 Industrial valves - Delivery specification3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 21465 and the following apply. 3.1 pressure-reducing valve A valve that reduces the upstream pressure to a desired downstream pressure through throttling of the valve disc, and maintains a substantially constant downstream pressure using the energy of the medium itself despite changes in upstream pressure and flow rate. 3.2 upstream pressure Pressure of the medium at the valve inlet. 3.3 downstream pressure Pressure of the medium at the valve outlet. 3.4 maximum upstream working pressure Under actual operating conditions, the upper limit of the actual upstream pressure required to maintain a given downstream pressure. 3.5 maximum flow rate Provided the pressure reducing valve has its inlet at the maximum upstream working pressure, and under a given downstream pressure, the upper limit of the flow rate that can be achieved when its deviation is within the specified range. 3.6 pressure raise value from dynamic to static after valve Provided the upstream pressure of a pressure reducing valve is stable, the increase in downstream pressure before and after the valve closes when it transitions from dynamic state to a static state after valve. 3.7 pressure characteristics When the downstream flow rate is constant and the upstream pressure changes, the functional relationship between downstream pressure and upstream pressure. 3.8 flow characteristics Under steady flow conditions, when the upstream pressure is constant, the functional relationship between downstream pressure and flow rate.4 Technical requirements
4.1 Pressure-temperature ratings The pressure-temperature ratings of steel pressure reducing valve body material shall comply with the provisions of GB/T 12224; the pressure-temperature ratings of iron pressure reducing valve body material shall comply with the provisions of GB/T 17241.1; the pressure-temperature ratings of cast copper pressure reducing valve body material shall comply with the provisions of GB/T 15530.8. 4.2 Materials The materials for carbon steel forgings, carbon steel castings, and stainless steel castings of pressure reducing valves shall comply with the provisions of GB/T 12228, GB/T 12229, and GB/T 12230; the gray iron material for pressure reducing valves shall comply with the provisions of GB/T 12226; the ductile iron material for pressure reducing valves shall comply with the provisions of GB/T 12227; the copper and copper alloy material for pressure reducing valves shall comply with the provisions of GB/T 1176, GB/T 13819, and GB/T 12225. 4.3 General requirements 4.3.1 The model designation method for pressure reducing valves shall comply with the provisions of GB/T 32808. 4.3.2 The nominal dimensions shall comply with the provisions of GB/T 1047. 4.3.3 The nominal pressure shall comply with the provisions of GB/T 1048. 4.3.4 The face-to-face dimensions of the flange connection shall comply with the provisions of JB/T 2205. 4.3.5 The nominal pressure and nominal dimensions of the flanges connecting the inlet and outlet ends of the valve body shall be consistent, unless otherwise specified in the purchase contract. 4.3.6 The flange connection dimensions and the sealing face shape and dimensions of steel pressure reducing valves shall comply with the provisions of GB/T 9124.1. 4.3.7 The flange connection dimensions and the sealing face shape and dimensions of iron pressure reducing valves shall comply with the provisions of GB/T 17241.1. 4.3.8 The flange connection dimensions and the sealing face shape and dimensions of copper pressure reducing valves shall comply with the provisions of GB/T 15530.1. 4.3.9 The minimum wall thickness of the shell of steel and iron pressure reducing valves shall comply with the requirements for stop valves in GB/T 26640.The minimum wall thickness of the shell of copper pressure reducing valves shall be designed by the manufacturer according to relevant standards and specifications. 4.3.10 For pressure reducing valves requiring non-destructive testing in the purchase contract, non-destructive testing shall be performed in accordance with the provisions of GB/T 12224 and/or the provisions of the purchase contract. 4.3.11 The painting of pressure reducing valves shall comply with the provisions of JB/T 106. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
