Low temperature valve - Technical specifications
1 Scope
This standard specifies the structural types, technical requirements, test methods, inspection rules, marking, painting, packaging, transportation and storage of low temperature valve (hereinafter referred to as “valve”).
This standard is applicable to the flanged, wafer and welded low-temperature gate valves, stop valves, check valves, ball valves and butterfly valves with nominal pressures of PN16~PN400 and nominal dimension of DN15~DN1,200, or those with pressure class of 150~2,500, nominal dimension of NPS 1/2~NPS 48 and medium temperature of -196℃~-29℃.
This standard may be used for reference for other low temperature valves.
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 9113 Integral steel pipe flanges
GB/T 12220 Industrial valves - Marking
GB/T 12221 Metal calves - Face to face, end to end, center to face and center to end dimensions
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 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12234 Bolted bonnet steel gate valves for petroleum and natural gas industries
GB/T 12235 Steel globe valves and lift check valve for petroleum petrochemical and allied industries
GB/T 12236 Steel swing check valve for petroleum petrochemical and allied industries
GB/T 12237 Steel ball valves for petroleum petrochemical and allied industries
GB/T 12238 Flanged and wafer resilient seal butterfly valves
GB/T 13402 Large diameter steel pipe flanges
GB/T 21387 Axial flow check valve
GB/T 22652 Overlaying-welding procedure qualification for valves sealing face
GB/T 26479 Fire test for soft-seated quarter-turn valves
GB/T 26480 Valve inspection and testing
GB/T 26482 Fire type-testing requirement for check valves
GB/T 26640 Specification for minimal thickness of the shell of valves
GB/T 28776 Steel gate, globe and check valve for the petroleum and natural gas industries (for sizes DN100 and smaller)
JB/T 6438 Technical requirements for plasma arc overlaying welding for valve sealing surface
JB/T 6439-2008 Methods of magnetic examination for valves
JB/T 6440-2008 Methods of radiographic examination for steel castings valves
JB/T 6903-2008 Methods for ultrasonic examination of steel forgings for valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
JB/T 7746 Compact steel valves
JB/T 7927 Valve cast steel visual quality requirements
JB/T 7928 Industrial valves - Delivery specification
JB/T 8527 Metallic sealing butterfly valve
JB/T 12003 Specification for valve cryogenic test rig
JB/T 12622 Liquefied natural gas valves - Performance testing
NB/T 47009 Low alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments
NB/T 47013.2-2015 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47014 Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bonnet extension
part between the top of the bonnet bracket and the bottom of the bonnet packing box
part between the top of the lower bushing of the bonnet and the bottom of the packing box for the valve with lifting stem
part between the top of the lower bonnet bearing and the bottom of the packing box for quarter-turn valve
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Structural types
5 Technical requirements
5.1 General requirements
5.2 Performance
5.3 Valve body
5.4 Bonnet
5.5 Valve stem
5.6 Opening and closing parts and valve seats
5.7 Packing and packing box
5.8 Middle flange seal
5.9 Operation
5.10 Materials
5.11 Appearance quality of steel casting
5.12 Defect disposal
5.13 Non-destructive testing
6 Test methods
6.1 Marking inspection
6.2 Appearance quality of steel castings
6.3 Dimension inspection
6.4 Chemical composition
6.5 Mechanical properties
6.6 Cold test
6.7 Low temperature test
6.8 Low-temperature cycle life test
6.9 Non-destructive testing
6.10 Anti-static test
7 Inspection rules
7.1 Inspection items
7.2 End-of-manufacturing inspection
7.3 Type test
8 Marking
9 Painting, packaging, transportation and storage
Annex A (Informative) Recommended material of low temperature valve
Annex B (Informative) Schematic diagram for internal cooling cycle
Low temperature valve - Technical specifications
1 Scope
This standard specifies the structural types, technical requirements, test methods, inspection rules, marking, painting, packaging, transportation and storage of low temperature valve (hereinafter referred to as “valve”).
This standard is applicable to the flanged, wafer and welded low-temperature gate valves, stop valves, check valves, ball valves and butterfly valves with nominal pressures of PN16~PN400 and nominal dimension of DN15~DN1,200, or those with pressure class of 150~2,500, nominal dimension of NPS 1/2~NPS 48 and medium temperature of -196℃~-29℃.
This standard may be used for reference for other low temperature valves.
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 9113 Integral steel pipe flanges
GB/T 12220 Industrial valves - Marking
GB/T 12221 Metal calves - Face to face, end to end, center to face and center to end dimensions
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 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12234 Bolted bonnet steel gate valves for petroleum and natural gas industries
GB/T 12235 Steel globe valves and lift check valve for petroleum petrochemical and allied industries
GB/T 12236 Steel swing check valve for petroleum petrochemical and allied industries
GB/T 12237 Steel ball valves for petroleum petrochemical and allied industries
GB/T 12238 Flanged and wafer resilient seal butterfly valves
GB/T 13402 Large diameter steel pipe flanges
GB/T 21387 Axial flow check valve
GB/T 22652 Overlaying-welding procedure qualification for valves sealing face
GB/T 26479 Fire test for soft-seated quarter-turn valves
GB/T 26480 Valve inspection and testing
GB/T 26482 Fire type-testing requirement for check valves
GB/T 26640 Specification for minimal thickness of the shell of valves
GB/T 28776 Steel gate, globe and check valve for the petroleum and natural gas industries (for sizes DN100 and smaller)
JB/T 6438 Technical requirements for plasma arc overlaying welding for valve sealing surface
JB/T 6439-2008 Methods of magnetic examination for valves
JB/T 6440-2008 Methods of radiographic examination for steel castings valves
JB/T 6903-2008 Methods for ultrasonic examination of steel forgings for valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
JB/T 7746 Compact steel valves
JB/T 7927 Valve cast steel visual quality requirements
JB/T 7928 Industrial valves - Delivery specification
JB/T 8527 Metallic sealing butterfly valve
JB/T 12003 Specification for valve cryogenic test rig
JB/T 12622 Liquefied natural gas valves - Performance testing
NB/T 47009 Low alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments
NB/T 47013.2-2015 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47014 Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bonnet extension
part between the top of the bonnet bracket and the bottom of the bonnet packing box
part between the top of the lower bushing of the bonnet and the bottom of the packing box for the valve with lifting stem
part between the top of the lower bonnet bearing and the bottom of the packing box for quarter-turn valve
Contents of GB/T 24925-2019
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Structural types
5 Technical requirements
5.1 General requirements
5.2 Performance
5.3 Valve body
5.4 Bonnet
5.5 Valve stem
5.6 Opening and closing parts and valve seats
5.7 Packing and packing box
5.8 Middle flange seal
5.9 Operation
5.10 Materials
5.11 Appearance quality of steel casting
5.12 Defect disposal
5.13 Non-destructive testing
6 Test methods
6.1 Marking inspection
6.2 Appearance quality of steel castings
6.3 Dimension inspection
6.4 Chemical composition
6.5 Mechanical properties
6.6 Cold test
6.7 Low temperature test
6.8 Low-temperature cycle life test
6.9 Non-destructive testing
6.10 Anti-static test
7 Inspection rules
7.1 Inspection items
7.2 End-of-manufacturing inspection
7.3 Type test
8 Marking
9 Painting, packaging, transportation and storage
Annex A (Informative) Recommended material of low temperature valve
Annex B (Informative) Schematic diagram for internal cooling cycle
