GB/T 12244-2025 Pressure reducing valves—General requirements 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.)
1 Scope
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, storage and transportation for pressure reducing valves.
This document applies to pressure reducing valves used in pipelines with a nominal size from DN15 to DN1200, a nominal pressure from PN6 to PN160, and conveying media such as gas, steam, or water.
2 Normative References
The following documents, through normative reference in the text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (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 Part-turn valve actuator attachments
GB/T 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12226 General purpose industrial valve - Specification of flake graphite iron castings
GB/T 12227 General purpose industrial valve - Specification of spheroidal graphite iron castings
GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings
GB/T 12229 General Purpose industrial valves - Specification of 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 specification
3 Terms and Definitions
The terms and definitions defined in GB/T 21465 and the following apply to this document.
3.1
pressure reducing valve
A valve that reduces the inlet pressure to a required downstream pressure by means of throttling through the valve disc, and which utilizes the energy of the medium itself to maintain the downstream pressure essentially constant when the inlet pressure and flow rate fluctuate.
3.2
upstream pressure
The medium pressure at the inlet end of the valve.
3.3
downstream pressure
The medium pressure at the outlet end of the valve.
3.4
maximum upstream working pressure
Under actual operating conditions, the upper limit of the actual inlet pressure required to maintain the downstream pressure at a given value.
3.5
maximum flow rate
When the inlet of the pressure reducing valve is at the maximum upstream working pressure and under a given downstream pressure, the upper flow limit achievable while its deviation remains within the specified range.
3.6
pressure raise value from dynamic to static after valve
Under stable inlet pressure conditions, the rise in downstream pressure before and after closing when the flow state downstream of the valve changes from flowing to closed (static).
3.7
pressure characteristics
The functional relationship between the downstream pressure and the inlet pressure when the outlet flow rate is constant and the inlet pressure changes.
3.8
flow characteristics
Under steady flow conditions, the functional relationship between the downstream pressure and the flow rate when the inlet pressure is constant.
4 Technical Requirements
4.1 Pressure-Temperature Ratings
The pressure-temperature ratings for the shell materials of steel pressure reducing valves shall conform to GB/T 12224; for iron pressure reducing valves, they shall conform to GB/T 17241.1; for cast copper pressure reducing valves, they shall conform to GB/T 15530.8.
4.2 Materials
Materials for carbon steel forgings, carbon steel castings, and stainless steel castings for pressure reducing valves shall conform to GB/T 12228, GB/T 12229, and GB/T 12230 respectively; materials for grey cast iron pressure reducing valves shall conform to GB/T 12226; materials for spheroidal graphite cast iron pressure reducing valves shall conform to GB/T 12227; materials for copper and copper alloy pressure reducing valves shall conform to 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 conform to GB/T 32808.
4.3.2 Nominal size shall conform to GB/T 1047.
4.3.3 Nominal pressure shall conform to GB/T 1048.
4.3.4 Face-to-face dimensions for flange connections shall conform to JB/T 2205.
4.3.5 The nominal pressure and nominal size of the connection flanges at both the inlet and outlet ends of the valve body shall be consistent, unless otherwise specified in the purchase order.
4.3.6 Flange connection dimensions and the form and dimensions of sealing surfaces for steel pressure reducing valves shall conform to GB/T 9124.1.
4.3.7 Flange connection dimensions and the form and dimensions of sealing surfaces for iron pressure reducing valves shall conform to GB/T 17241.1.
4.3.8 Flange connection dimensions and the form and dimensions of sealing surfaces for copper pressure reducing valves shall conform to GB/T 15530.1.
4.3.9 The minimum shell wall thickness for steel and iron pressure reducing valves shall meet the requirements for globe valves specified in GB/T 26640. The minimum shell wall thickness for copper pressure reducing valves shall be designed by the manufacturer according to relevant standards and specifications.
4.3.10 For pressure reducing valves where non-destructive testing is specified in the purchase order, non-destructive testing shall be performed according to GB/T 12224 and/or the provisions of the purchase order.
4.3.11 The painting of pressure reducing valves shall conform to JB/T 106.
4.4 Performance Requirements
4.4.1 Shell Strength
The pressure reducing valve shell shall not suffer structural damage nor exhibit visible leakage during the shell test.
4.4.2 Pressure Regulation Performance
When the inlet pressure of the pressure reducing valve is the maximum upstream working pressure, and within the given pressure regulation range, the downstream pressure shall be capable of being adjusted continuously and smoothly between the specified maximum and minimum values, without sticking, blocking, or abnormal vibration.
4.4.3 Flow
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Requirements
4.1 Pressure-Temperature Ratings
4.2 Materials
4.3 General Requirements
4.4 Performance Requirements
5 Test Methods
6 Inspection Rules
6.1 Routine Tests
6.2 Type Tests
7 Marking
7.1 Content of Marking
7.2 Marking on Valve Body
7.3 Marking on Nameplate
8 Packaging, Storage and Transportation
Table 1 Inspection Items
GB/T 12244-2025 Pressure reducing valves—General requirements 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.)
1 Scope
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, storage and transportation for pressure reducing valves.
This document applies to pressure reducing valves used in pipelines with a nominal size from DN15 to DN1200, a nominal pressure from PN6 to PN160, and conveying media such as gas, steam, or water.
2 Normative References
The following documents, through normative reference in the text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (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 Part-turn valve actuator attachments
GB/T 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12226 General purpose industrial valve - Specification of flake graphite iron castings
GB/T 12227 General purpose industrial valve - Specification of spheroidal graphite iron castings
GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings
GB/T 12229 General Purpose industrial valves - Specification of 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 specification
3 Terms and Definitions
The terms and definitions defined in GB/T 21465 and the following apply to this document.
3.1
pressure reducing valve
A valve that reduces the inlet pressure to a required downstream pressure by means of throttling through the valve disc, and which utilizes the energy of the medium itself to maintain the downstream pressure essentially constant when the inlet pressure and flow rate fluctuate.
3.2
upstream pressure
The medium pressure at the inlet end of the valve.
3.3
downstream pressure
The medium pressure at the outlet end of the valve.
3.4
maximum upstream working pressure
Under actual operating conditions, the upper limit of the actual inlet pressure required to maintain the downstream pressure at a given value.
3.5
maximum flow rate
When the inlet of the pressure reducing valve is at the maximum upstream working pressure and under a given downstream pressure, the upper flow limit achievable while its deviation remains within the specified range.
3.6
pressure raise value from dynamic to static after valve
Under stable inlet pressure conditions, the rise in downstream pressure before and after closing when the flow state downstream of the valve changes from flowing to closed (static).
3.7
pressure characteristics
The functional relationship between the downstream pressure and the inlet pressure when the outlet flow rate is constant and the inlet pressure changes.
3.8
flow characteristics
Under steady flow conditions, the functional relationship between the downstream pressure and the flow rate when the inlet pressure is constant.
4 Technical Requirements
4.1 Pressure-Temperature Ratings
The pressure-temperature ratings for the shell materials of steel pressure reducing valves shall conform to GB/T 12224; for iron pressure reducing valves, they shall conform to GB/T 17241.1; for cast copper pressure reducing valves, they shall conform to GB/T 15530.8.
4.2 Materials
Materials for carbon steel forgings, carbon steel castings, and stainless steel castings for pressure reducing valves shall conform to GB/T 12228, GB/T 12229, and GB/T 12230 respectively; materials for grey cast iron pressure reducing valves shall conform to GB/T 12226; materials for spheroidal graphite cast iron pressure reducing valves shall conform to GB/T 12227; materials for copper and copper alloy pressure reducing valves shall conform to 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 conform to GB/T 32808.
4.3.2 Nominal size shall conform to GB/T 1047.
4.3.3 Nominal pressure shall conform to GB/T 1048.
4.3.4 Face-to-face dimensions for flange connections shall conform to JB/T 2205.
4.3.5 The nominal pressure and nominal size of the connection flanges at both the inlet and outlet ends of the valve body shall be consistent, unless otherwise specified in the purchase order.
4.3.6 Flange connection dimensions and the form and dimensions of sealing surfaces for steel pressure reducing valves shall conform to GB/T 9124.1.
4.3.7 Flange connection dimensions and the form and dimensions of sealing surfaces for iron pressure reducing valves shall conform to GB/T 17241.1.
4.3.8 Flange connection dimensions and the form and dimensions of sealing surfaces for copper pressure reducing valves shall conform to GB/T 15530.1.
4.3.9 The minimum shell wall thickness for steel and iron pressure reducing valves shall meet the requirements for globe valves specified in GB/T 26640. The minimum shell wall thickness for copper pressure reducing valves shall be designed by the manufacturer according to relevant standards and specifications.
4.3.10 For pressure reducing valves where non-destructive testing is specified in the purchase order, non-destructive testing shall be performed according to GB/T 12224 and/or the provisions of the purchase order.
4.3.11 The painting of pressure reducing valves shall conform to JB/T 106.
4.4 Performance Requirements
4.4.1 Shell Strength
The pressure reducing valve shell shall not suffer structural damage nor exhibit visible leakage during the shell test.
4.4.2 Pressure Regulation Performance
When the inlet pressure of the pressure reducing valve is the maximum upstream working pressure, and within the given pressure regulation range, the downstream pressure shall be capable of being adjusted continuously and smoothly between the specified maximum and minimum values, without sticking, blocking, or abnormal vibration.
4.4.3 Flow
Contents of GB/T 12244-2025
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Requirements
4.1 Pressure-Temperature Ratings
4.2 Materials
4.3 General Requirements
4.4 Performance Requirements
5 Test Methods
6 Inspection Rules
6.1 Routine Tests
6.2 Type Tests
7 Marking
7.1 Content of Marking
7.2 Marking on Valve Body
7.3 Marking on Nameplate
8 Packaging, Storage and Transportation
Table 1 Inspection Items
