GB/T 19672-2021 Pipeline valves - Technical specification
1 Scope
This document specifies the terms and definitions, structural types and dimensional parameters, ordering requirements, technical requirements, materials, inspection rules, test methods, and marking for valves used for oil and natural gas pipelines and pipeline systems.
This document is applicable to ball valves, gate valves, plug valves and check valves for pipeline systems with nominal pressures of PN20 to PN400 and nominal sizes of not greater than DN1500, and with pressure classes of Class 150 to Class 2500 and nominal sizes of not greater than NPS60.
This document is not applicable to valves for subsea pipeline systems.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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 150.3 Pressure vessels - Part 3: Design
GB/T 150.4 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 699 Quality carbon structure steels
GB/T 1220 Stainless steel bars
GB/T 7306 (all parts) Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads
GB/T 9124 (all parts) Steel pipe flanges
GB/T 12222 Multi-turn valve actuator attachments
GB/T 12223 Part-turn valve actuator attachments
GB/T 12224 General requirements for industrial steel valves
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 13927-2008 Industrial valves - Pressure testing
GB/T 20972 (all parts) Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production
GB/T 26479 Fire test for soft-seated quarter-turn valves
GB/T 26482 Fire type-testing requirement for check valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
SY/T 7024 Specification for onsite hardness testing of metal materials used in oil and gas field containing hydrogen sulfide
ISO 10497 Testing of valves - Fire type-testing requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
full opening valve
valve that, when fully open, has a circular flow passage throughout, with the inside diameter of flow passage equal to that of the pipeline
3.2
reduced opening valve
valve that, when fully open, has a circular flow passage, where the inside diameter of flow passage at the valve connecting end is equal to the inside diameter of the pipeline, and that at the closure member is reduced
3.3
reduced bore valve
valve in which the connecting ends of the valve body to the pipeline are circular, but the flow passage inside the valve body is rectangular or trapezoidal
Example:
Plug valves.
3.4
double-block-and-bleed valve; DBB
valve having two sealing pairs, which, in the closed position, can simultaneously seal against pressure from both ends, and the medium in the cavity between the two sealing seats can be vented or drained
3.5
double-isolation-and-bleed valve; DIB
valve having two sealing pairs, which, in the closed position, can seal against pressure from both directions, and the medium in the cavity between the two sealing seats can be vented or drained
Note: It is classified as DIB-1 and DIB-2 by function. DIB‑1 means that both seats are bi‑directional sealing, while DIB‑2 means that one seat is uni‑directional sealing and the other is bi‑directional sealing.
3.6
locking device
device for securing a valve in the open and/or closed position
3.7
drive train
all parts of the closure members on the valve, excluding the valve actuator
3.8
piggability
ability of a valve to allow passage of a spherical pig (used for cleaning the inner wall of pipeline) without obstruction
4 Structural types and dimensional parameters
4.1 Structural types
4.1.1 Schematic diagram of structure
Please refer to Annex A for typical structural diagrams of ball valves, gate valves, plug valves and check valves for pipelines.
4.1.2 Ball valves
The closure member of a ball valve shall be a sphere that rotates about an axis perpendicular to the medium flow direction. The ball of the ball valve shall be machined from a solid sphere.
4.1.3 Gate valves
4.1.3.1 The closure member of a gate valve shall be either a single gate with parallel sealing surfaces, or an expanding-type gate consisting of two or more pieces with parallel sealing surfaces.
4.1.3.2 In addition to the packing seal of the valve stem, there shall be a backseat structure or a corresponding auxiliary stem sealing structure (e.g., grease injection).
4.1.4 Plug valves
4.1.4.1 The closure member of a plug valve shall be a conical body that rotates about an axis perpendicular to the medium flow direction.
4.1.4.2 The closure member of a plug valve may be of lubricated or non‑lubricated.
4.1.5 Check valves
4.1.5.1 The closure member of a check valve shall be a single disc or two half‑discs, and may be of swing‑type or axial‑flow type. The closure member shall be capable of automatic return when there is no medium flow.
4.1.5.2 When pipeline piggability is required, the flow passage of the swing‑type check valve adopted shall have the same inside diameter as the pipeline of the same specification, and the disc, after opening, shall allow passage of the cleaning pig.
4.2 Valve flow passage size
4.2.1 Minimum flow passage diameter
4.2.1.1 The minimum flow passage diameter of a full opening valve shall not be less than those specified in Table 1. For nominal pressures and nominal sizes (or pressure classes and nominal sizes) of valves not listed in Table 1, the order requirements shall apply.
4.2.1.2 For reduced opening valves of nominal size DN100 to DN300 (NPS4 to NPS12), the minimum flow passage diameter shall be one level smaller than that given in Table 1; for reduced opening valves of nominal size DN350 to DN600 (NPS14 to NPS24), the minimum flow passage diameter shall be two levels smaller than that given in Table 1.
4.2.2 Representation of valve nominal size
4.2.2.1 For a full opening valve, when in the fully open position, the flow passage diameter shall not be less than those specified in Table 1, and shall be expressed in its nominal size.
4.2.2.2 Reduced opening valves shall be expressed by a combination of two sets of numbers: the first set is the nominal size of the pipeline at the valve connecting end, which determines the face‑to‑face and end-to-end dimensions of the valve; the second set is the nominal size corresponding to the minimum diameter of the valve as listed in Table 1 [except for DN50 (NPS2)]. For example: a valve having a nominal size of DN400 (NPS16) (same as the nominal size of the pipeline at the connecting end), after reduction, has a circular opening with a minimum diameter of 303mm [refer to Table 1, the corresponding nominal size is DN300 (NPS12)], and the marking shall be: DN400×300 (NPS16×12).
4.2.2.3 Reduced bore valves and reduced opening check valves shall be expressed by adding the letter "R" after the valve nominal size. For example: a plug valve having a nominal size of DN100 (NPS4) with a rectangular opening as the closure member shall be expressed as "DN100R (NPS4R)".
4.3 Face‑to‑face and end-to-end dimensions of valves
Unless otherwise specified in the order contract, the face‑to‑face and end-to-end dimensions and deviations of valves shall be in accordance with Annex B.
Table 1 Minimum flow passage diameters of valves
In mm
4.4 Shell wall thickness
For split bolted valve bodies, the minimum shell wall thickness shall be in accordance with GB/T 12224; for welded valve bodies, the minimum shell wall thickness shall be in accordance with GB/T 150.3.
5 Ordering requirements
5.1 When ordering valves, the purchaser shall determine the valve types and technical requirements in the order contract, and shall ensure that sufficient information is transmitted to all relevant parties. The purchaser may order by reference to Table C.1 of Annex C.
5.2 For valves with pressure‑containing closed cavities that may cause internal pressure rise when the valve is in the fully open or fully closed position, a pressure relief device shall be installed on the valve body according to the requirements of 6.7.
5.3 When pipeline piggability is required, it shall be confirmed whether the internal structure of the valve allows passage of the pig. Valves with closure members obstructing the flow passage and reduced opening valves are not suitable for pigging.
5.4 The fire‑resistant structure design of valves shall be verified and qualified in accordance with GB/T 26479, GB/T 26482, ISO 10497, or agreed standards.
6 Technical requirements
6.1 Pressure-temperature rating
The pressure‑temperature rating of the valve shell shall meet the requirements of GB/T 12224.
6.2 Operating pressure and temperature of valve
The operating pressure and temperature of the valve may be lower than the pressure-temperature rating of the valve shell due to the limits by the allowable pressure and temperature of the non‑metallic materials used for the seat seal and packing seal. The range of maximum operating pressure and temperature of the valve shall be limited according to its structure and the non‑metallic materials used for the seat seal and packing seal, and shall not exceed the pressure‑temperature rating of the ball valve shell. The minimum and maximum operating temperatures, the corresponding operating pressures, and the maximum pressure differential shall be clearly indicated on the nameplate.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Structural types and dimensional parameters
4.1 Structural types
4.2 Valve flow passage size
4.3 Face‑to‑face and end-to-end dimensions of valves
4.4 Shell wall thickness
5 Ordering requirements
6 Technical requirements
6.1 Pressure-temperature rating
6.2 Operating pressure and temperature of valve
6.3 Connecting end of valve to pipeline
6.4 Valve operation
6.5 Flow coefficient
6.6 Shell bolting
6.7 Pressure relief of valve body cavity
6.8 Bypass, drain and vent connections
6.9 Blowout‑proof structure of valve stem
6.10 Grease injection
6.11 Handwheels and wrenches (levers)
6.12 Actuators
6.13 Valve opening indication
6.14 Locking device
6.15 Sealing of stem packing and operating mechanism
6.16 Strength design of drive train parts
6.17 Lifting lugs
6.18 Electrostatic discharge device
6.19 Fire resistance test
7 Materials
7.1 Valve shell materials
7.2 Materials of connecting bolts and nuts
7.3 Non‑metallic materials
7.4 Low‑temperature material performance requirements
7.5 Welding of valves
7.6 Hardness requirements
8 Inspection rules
8.1 End-of-manufacturing inspection
8.2 Type test
9 Test methods
9.1 General
9.2 Shell test
9.3 Backseat test
9.4 Seal test
9.5 Installation of valve body cavity connection after pressure test
9.6 Electrostatic discharge test
9.7 Testing of operating torque or thrust
10 Marking
Annex A (Informative) Valve structure
Annex B (Normative) Face-to-face and end-to-end dimensions of valves
Annex C (Informative) Order contract data sheet
Figure 1 Weld metal specimen location
Figure 2 Heat-affected zone specimen location
Figure A.1 Three-piece ball valve
Figure A.2 Welded-body ball valve
Figure A.3 Flat plate single gate valve
Figure A.4 Flat plate double gate valve
Figure A.5 Plug valve
Figure A.6 Full opening swing check valve
Figure A.7 Single-plate wafer-type check valve
Figure A.8 Dual-plate wafer-type check valve
Figure A.9 Axial flow check valve
Table 1 Minimum flow passage diameters of valves
Table 2 Minimum thread sizes for bypass, drain and vent connections
Table 3 Materials of main parts
Table 4 Charpy V-notch impact requirements (full‑size specimens)
Table 5 Inspection items
Table 6 Duration for test pressure
Table B.1 Face-to-face and end-to-end dimensions of ball valves
Table B.2 Face-to-face and end-to-end dimensions of short-pattern ball valves
Table B.3 Face-to-face and end-to-end dimensions of gate valves
Table B.4 Face-to-face and end-to-end dimensions of plug valves
Table B.5 Face-to-face and end-to-end dimensions of swing check valves
Table B.6 Face-to-face and end-to-end dimensions of single- and dual-plate wafer-type check valves
Table B.7 Face-to-face and end-to-end dimensions of axial flow check valves
Table C.1 Order contract data sheet of valves
GB/T 19672-2021 Pipeline valves - Technical specification
1 Scope
This document specifies the terms and definitions, structural types and dimensional parameters, ordering requirements, technical requirements, materials, inspection rules, test methods, and marking for valves used for oil and natural gas pipelines and pipeline systems.
This document is applicable to ball valves, gate valves, plug valves and check valves for pipeline systems with nominal pressures of PN20 to PN400 and nominal sizes of not greater than DN1500, and with pressure classes of Class 150 to Class 2500 and nominal sizes of not greater than NPS60.
This document is not applicable to valves for subsea pipeline systems.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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 150.3 Pressure vessels - Part 3: Design
GB/T 150.4 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 699 Quality carbon structure steels
GB/T 1220 Stainless steel bars
GB/T 7306 (all parts) Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads
GB/T 9124 (all parts) Steel pipe flanges
GB/T 12222 Multi-turn valve actuator attachments
GB/T 12223 Part-turn valve actuator attachments
GB/T 12224 General requirements for industrial steel valves
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 13927-2008 Industrial valves - Pressure testing
GB/T 20972 (all parts) Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production
GB/T 26479 Fire test for soft-seated quarter-turn valves
GB/T 26482 Fire type-testing requirement for check valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
SY/T 7024 Specification for onsite hardness testing of metal materials used in oil and gas field containing hydrogen sulfide
ISO 10497 Testing of valves - Fire type-testing requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
full opening valve
valve that, when fully open, has a circular flow passage throughout, with the inside diameter of flow passage equal to that of the pipeline
3.2
reduced opening valve
valve that, when fully open, has a circular flow passage, where the inside diameter of flow passage at the valve connecting end is equal to the inside diameter of the pipeline, and that at the closure member is reduced
3.3
reduced bore valve
valve in which the connecting ends of the valve body to the pipeline are circular, but the flow passage inside the valve body is rectangular or trapezoidal
Example:
Plug valves.
3.4
double-block-and-bleed valve; DBB
valve having two sealing pairs, which, in the closed position, can simultaneously seal against pressure from both ends, and the medium in the cavity between the two sealing seats can be vented or drained
3.5
double-isolation-and-bleed valve; DIB
valve having two sealing pairs, which, in the closed position, can seal against pressure from both directions, and the medium in the cavity between the two sealing seats can be vented or drained
Note: It is classified as DIB-1 and DIB-2 by function. DIB‑1 means that both seats are bi‑directional sealing, while DIB‑2 means that one seat is uni‑directional sealing and the other is bi‑directional sealing.
3.6
locking device
device for securing a valve in the open and/or closed position
3.7
drive train
all parts of the closure members on the valve, excluding the valve actuator
3.8
piggability
ability of a valve to allow passage of a spherical pig (used for cleaning the inner wall of pipeline) without obstruction
4 Structural types and dimensional parameters
4.1 Structural types
4.1.1 Schematic diagram of structure
Please refer to Annex A for typical structural diagrams of ball valves, gate valves, plug valves and check valves for pipelines.
4.1.2 Ball valves
The closure member of a ball valve shall be a sphere that rotates about an axis perpendicular to the medium flow direction. The ball of the ball valve shall be machined from a solid sphere.
4.1.3 Gate valves
4.1.3.1 The closure member of a gate valve shall be either a single gate with parallel sealing surfaces, or an expanding-type gate consisting of two or more pieces with parallel sealing surfaces.
4.1.3.2 In addition to the packing seal of the valve stem, there shall be a backseat structure or a corresponding auxiliary stem sealing structure (e.g., grease injection).
4.1.4 Plug valves
4.1.4.1 The closure member of a plug valve shall be a conical body that rotates about an axis perpendicular to the medium flow direction.
4.1.4.2 The closure member of a plug valve may be of lubricated or non‑lubricated.
4.1.5 Check valves
4.1.5.1 The closure member of a check valve shall be a single disc or two half‑discs, and may be of swing‑type or axial‑flow type. The closure member shall be capable of automatic return when there is no medium flow.
4.1.5.2 When pipeline piggability is required, the flow passage of the swing‑type check valve adopted shall have the same inside diameter as the pipeline of the same specification, and the disc, after opening, shall allow passage of the cleaning pig.
4.2 Valve flow passage size
4.2.1 Minimum flow passage diameter
4.2.1.1 The minimum flow passage diameter of a full opening valve shall not be less than those specified in Table 1. For nominal pressures and nominal sizes (or pressure classes and nominal sizes) of valves not listed in Table 1, the order requirements shall apply.
4.2.1.2 For reduced opening valves of nominal size DN100 to DN300 (NPS4 to NPS12), the minimum flow passage diameter shall be one level smaller than that given in Table 1; for reduced opening valves of nominal size DN350 to DN600 (NPS14 to NPS24), the minimum flow passage diameter shall be two levels smaller than that given in Table 1.
4.2.2 Representation of valve nominal size
4.2.2.1 For a full opening valve, when in the fully open position, the flow passage diameter shall not be less than those specified in Table 1, and shall be expressed in its nominal size.
4.2.2.2 Reduced opening valves shall be expressed by a combination of two sets of numbers: the first set is the nominal size of the pipeline at the valve connecting end, which determines the face‑to‑face and end-to-end dimensions of the valve; the second set is the nominal size corresponding to the minimum diameter of the valve as listed in Table 1 [except for DN50 (NPS2)]. For example: a valve having a nominal size of DN400 (NPS16) (same as the nominal size of the pipeline at the connecting end), after reduction, has a circular opening with a minimum diameter of 303mm [refer to Table 1, the corresponding nominal size is DN300 (NPS12)], and the marking shall be: DN400×300 (NPS16×12).
4.2.2.3 Reduced bore valves and reduced opening check valves shall be expressed by adding the letter "R" after the valve nominal size. For example: a plug valve having a nominal size of DN100 (NPS4) with a rectangular opening as the closure member shall be expressed as "DN100R (NPS4R)".
4.3 Face‑to‑face and end-to-end dimensions of valves
Unless otherwise specified in the order contract, the face‑to‑face and end-to-end dimensions and deviations of valves shall be in accordance with Annex B.
Table 1 Minimum flow passage diameters of valves
In mm
4.4 Shell wall thickness
For split bolted valve bodies, the minimum shell wall thickness shall be in accordance with GB/T 12224; for welded valve bodies, the minimum shell wall thickness shall be in accordance with GB/T 150.3.
5 Ordering requirements
5.1 When ordering valves, the purchaser shall determine the valve types and technical requirements in the order contract, and shall ensure that sufficient information is transmitted to all relevant parties. The purchaser may order by reference to Table C.1 of Annex C.
5.2 For valves with pressure‑containing closed cavities that may cause internal pressure rise when the valve is in the fully open or fully closed position, a pressure relief device shall be installed on the valve body according to the requirements of 6.7.
5.3 When pipeline piggability is required, it shall be confirmed whether the internal structure of the valve allows passage of the pig. Valves with closure members obstructing the flow passage and reduced opening valves are not suitable for pigging.
5.4 The fire‑resistant structure design of valves shall be verified and qualified in accordance with GB/T 26479, GB/T 26482, ISO 10497, or agreed standards.
6 Technical requirements
6.1 Pressure-temperature rating
The pressure‑temperature rating of the valve shell shall meet the requirements of GB/T 12224.
6.2 Operating pressure and temperature of valve
The operating pressure and temperature of the valve may be lower than the pressure-temperature rating of the valve shell due to the limits by the allowable pressure and temperature of the non‑metallic materials used for the seat seal and packing seal. The range of maximum operating pressure and temperature of the valve shall be limited according to its structure and the non‑metallic materials used for the seat seal and packing seal, and shall not exceed the pressure‑temperature rating of the ball valve shell. The minimum and maximum operating temperatures, the corresponding operating pressures, and the maximum pressure differential shall be clearly indicated on the nameplate.
Contents of GB/T 19672-2021
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Structural types and dimensional parameters
4.1 Structural types
4.2 Valve flow passage size
4.3 Face‑to‑face and end-to-end dimensions of valves
4.4 Shell wall thickness
5 Ordering requirements
6 Technical requirements
6.1 Pressure-temperature rating
6.2 Operating pressure and temperature of valve
6.3 Connecting end of valve to pipeline
6.4 Valve operation
6.5 Flow coefficient
6.6 Shell bolting
6.7 Pressure relief of valve body cavity
6.8 Bypass, drain and vent connections
6.9 Blowout‑proof structure of valve stem
6.10 Grease injection
6.11 Handwheels and wrenches (levers)
6.12 Actuators
6.13 Valve opening indication
6.14 Locking device
6.15 Sealing of stem packing and operating mechanism
6.16 Strength design of drive train parts
6.17 Lifting lugs
6.18 Electrostatic discharge device
6.19 Fire resistance test
7 Materials
7.1 Valve shell materials
7.2 Materials of connecting bolts and nuts
7.3 Non‑metallic materials
7.4 Low‑temperature material performance requirements
7.5 Welding of valves
7.6 Hardness requirements
8 Inspection rules
8.1 End-of-manufacturing inspection
8.2 Type test
9 Test methods
9.1 General
9.2 Shell test
9.3 Backseat test
9.4 Seal test
9.5 Installation of valve body cavity connection after pressure test
9.6 Electrostatic discharge test
9.7 Testing of operating torque or thrust
10 Marking
Annex A (Informative) Valve structure
Annex B (Normative) Face-to-face and end-to-end dimensions of valves
Annex C (Informative) Order contract data sheet
Figure 1 Weld metal specimen location
Figure 2 Heat-affected zone specimen location
Figure A.1 Three-piece ball valve
Figure A.2 Welded-body ball valve
Figure A.3 Flat plate single gate valve
Figure A.4 Flat plate double gate valve
Figure A.5 Plug valve
Figure A.6 Full opening swing check valve
Figure A.7 Single-plate wafer-type check valve
Figure A.8 Dual-plate wafer-type check valve
Figure A.9 Axial flow check valve
Table 1 Minimum flow passage diameters of valves
Table 2 Minimum thread sizes for bypass, drain and vent connections
Table 3 Materials of main parts
Table 4 Charpy V-notch impact requirements (full‑size specimens)
Table 5 Inspection items
Table 6 Duration for test pressure
Table B.1 Face-to-face and end-to-end dimensions of ball valves
Table B.2 Face-to-face and end-to-end dimensions of short-pattern ball valves
Table B.3 Face-to-face and end-to-end dimensions of gate valves
Table B.4 Face-to-face and end-to-end dimensions of plug valves
Table B.5 Face-to-face and end-to-end dimensions of swing check valves
Table B.6 Face-to-face and end-to-end dimensions of single- and dual-plate wafer-type check valves
Table B.7 Face-to-face and end-to-end dimensions of axial flow check valves
Table C.1 Order contract data sheet of valves
