GB 27790-2020 City gas pressure regulator English
City gas pressure regulator
1 Scope
This standard specifies terms, definitions and symbols, classification and labelling, structure and materials, requirements, test methods, inspection rules, marking, label and operating instructions as well as packaging, transport and storage of city gas pressure regulator (hereinafter referred to as pressure regulator).
This standard is applicable to the pressure regulators with a nominal diameter up to 400mm, an operating temperature range not exceeding -20℃~60℃ with the lower limit not less than the dew point temperature of the gas, and an inlet pressure up to 10.0MPa.
This standard is not applicable to the pressure regulators for liquefied petroleum gas in cylinders and those for dimethyl ether.
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 150 (all parts) Pressure vessel
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)
GB/T 699 Quality carbon structure steels
GB/T 1047 Pipework components - Definition and selection of nominal size
GB/T 1173 Casting aluminium alloy
GB/T 1220 Stainless steel bars
GB/T 1239.2 Cold coiled helical springs technical specifications - Part 2: Compressions spring
GB/T 1348 Spheroidal graphite iron castings
GB/T 1591 High strength low alloy structural steels
GB/T 1681 Rubber - Determination of rebound resilience of vulcanizates
GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method
GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids
GB/T 3077 Alloy structure steels
GB/T 3191 Aluminium and aluminium alloys extruded bars, rods
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 3452.1 Fluid power systems - O-rings - Part 1: Inside diameters, cross-sections, tolerances and size identification code
GB/T 3452.2 Fluid power systems - O-rings - Part 2: Quality acceptance criteria
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method
GB/T 4423 Copper and copper-alloy cold-drawn rod and bar
GB/T 6388 Transport package shipping mark
GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes
GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads
GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads
GB/T 7759 (all parts) Rubber, vulcanized or thermoplastic - Determination of compression set
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test
GB/T 9124.1 Steel pipe flanges - Part 1: PN designated
GB/T 9124.2 Steel pipe flanges - Part 2: Class designated
GB/T 9440 Malleable iron castings
GB/T 9443 Steel and iron castings - Liquid penetrant inspection
GB/T 9444 Steel and iron castings - Magnetic particle inspection
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB/T 12224 General requirements for industrial steel valves
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 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB/T 13306 Plates
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/T 13934 Rubber, vulcanized or thermoplastic - Determination of flex cracking and crack growth (De Mattia)
GB/T 15115 Die casting aluminium alloys
GB/T 17213.15 Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method
GB/T 20801.5 Pressure piping code - Industrial piping - Part 5: Inspection and testing
GB/T 23934 Hot formed helical compression springs - Technical Requirement
GB/T 32249 Aluminum and aluminum-alloy die forgings, hand forgings and rolled ring forgings - General specification
GB/T 38343 Technical specification for flange joints installation
GB 50058 Code for design of electrical installations in explosive atmospheres
CJ/T 180-2014 Manually operated gas valves for gas installations of buildings
CJ/T 335-2010 Slam-shut valves and relief valves for city gas
HG/T 20592 Steel pipe flanges (PN designated)
HG/T 20615 Steel pipe flanges (Class designated)
JB/T 6440 Methods of radiographic examination for steel castings valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
JB/T 7927 Valve cast steel visual quality requirements
JB/T 7944 Coiled helical springs - Sampling inspection
NB/T 47008 Carbon steel and alloy steel forgings for pressure equipment
NB/T 47009 Alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013 (all parts) Nondestructive testing of pressure equipments
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1.1
gas pressure regulator
equipment whose function is to automatically regulate the gas outlet pressure to maintain it within certain pressure range
3.1.2
series of pressure regulator
generic term for pressure regulators with the same design concept, similar structure but different nominal diameter
3.1.3
direct acting pressure regulator
pressure regulators which have a direct control by virtue of the outlet pressure variation over the actuator which drives the control members to move
Note: See Figure 1 for an example of the action principle of the direct acting pressure regulator.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Classification and model
4.1 Classification
4.2 Model
5 Structure and material
5.1 General requirements
5.2 Structure
5.3 Materials
6 Requirements
6.1 Appearance
6.2 Strength of pressure containing part
6.3 Inspection for finished product of diaphragm
6.4 External seal
6.5 Performance
6.6 Flow coefficient, Cg
6.7 Adaptability at limit temperature
6.8 Durability
6.9 Failure state
6.10 Performance of integrated shut-off device
6.11 Performance of integrated monitor
6.12 Performance of integrated release device
6.13 Torsion resistance and bending resistance of meter pressure regulator
7 Test methods
7.1 General requirements
7.2 Appearance
7.3 Strength of pressure-bearing parts
7.4 Inspection of finished diaphragm
7.5 External seal
7.6 Performance
7.7 Flow coefficient Cg
7.8 Adaptability at limit temperature
7.9 Durability
7.10 Failure state
7.11 Integrated shut-off device
7.12 Integrated monitor
7.13 Integrated release device
7.14 Torsion resistance and bending resistance of meter pressure regulator
8 Inspection rules
8.1 Inspection classification
8.2 Inspection items
8.3 End-of-manufacturing inspection
8.4 Type inspection
8.5 Judging rules
9 Marking, label and operating instructions
9.1 Marking and label
9.2 Operating instructions
10 Packaging, transport and storage
10.1 Packaging
10.2 Transport
10.3 Storage
Annex A (Normative) Physical and mechanical properties of rubber materials and gas resistance
Annex B (Informative) Storage of rubber parts of pressure regulators
Annex C (Normative) Alternative method for determining flow coefficient of mass flow regulators
Annex D (Informative) Flow characteristic
Annex E (Informative) Noise
GB 27790-2020 City gas pressure regulator English
City gas pressure regulator
1 Scope
This standard specifies terms, definitions and symbols, classification and labelling, structure and materials, requirements, test methods, inspection rules, marking, label and operating instructions as well as packaging, transport and storage of city gas pressure regulator (hereinafter referred to as pressure regulator).
This standard is applicable to the pressure regulators with a nominal diameter up to 400mm, an operating temperature range not exceeding -20℃~60℃ with the lower limit not less than the dew point temperature of the gas, and an inlet pressure up to 10.0MPa.
This standard is not applicable to the pressure regulators for liquefied petroleum gas in cylinders and those for dimethyl ether.
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 150 (all parts) Pressure vessel
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)
GB/T 699 Quality carbon structure steels
GB/T 1047 Pipework components - Definition and selection of nominal size
GB/T 1173 Casting aluminium alloy
GB/T 1220 Stainless steel bars
GB/T 1239.2 Cold coiled helical springs technical specifications - Part 2: Compressions spring
GB/T 1348 Spheroidal graphite iron castings
GB/T 1591 High strength low alloy structural steels
GB/T 1681 Rubber - Determination of rebound resilience of vulcanizates
GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method
GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids
GB/T 3077 Alloy structure steels
GB/T 3191 Aluminium and aluminium alloys extruded bars, rods
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 3452.1 Fluid power systems - O-rings - Part 1: Inside diameters, cross-sections, tolerances and size identification code
GB/T 3452.2 Fluid power systems - O-rings - Part 2: Quality acceptance criteria
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method
GB/T 4423 Copper and copper-alloy cold-drawn rod and bar
GB/T 6388 Transport package shipping mark
GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes
GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads
GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads
GB/T 7759 (all parts) Rubber, vulcanized or thermoplastic - Determination of compression set
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test
GB/T 9124.1 Steel pipe flanges - Part 1: PN designated
GB/T 9124.2 Steel pipe flanges - Part 2: Class designated
GB/T 9440 Malleable iron castings
GB/T 9443 Steel and iron castings - Liquid penetrant inspection
GB/T 9444 Steel and iron castings - Magnetic particle inspection
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB/T 12224 General requirements for industrial steel valves
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 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB/T 13306 Plates
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/T 13934 Rubber, vulcanized or thermoplastic - Determination of flex cracking and crack growth (De Mattia)
GB/T 15115 Die casting aluminium alloys
GB/T 17213.15 Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method
GB/T 20801.5 Pressure piping code - Industrial piping - Part 5: Inspection and testing
GB/T 23934 Hot formed helical compression springs - Technical Requirement
GB/T 32249 Aluminum and aluminum-alloy die forgings, hand forgings and rolled ring forgings - General specification
GB/T 38343 Technical specification for flange joints installation
GB 50058 Code for design of electrical installations in explosive atmospheres
CJ/T 180-2014 Manually operated gas valves for gas installations of buildings
CJ/T 335-2010 Slam-shut valves and relief valves for city gas
HG/T 20592 Steel pipe flanges (PN designated)
HG/T 20615 Steel pipe flanges (Class designated)
JB/T 6440 Methods of radiographic examination for steel castings valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
JB/T 7927 Valve cast steel visual quality requirements
JB/T 7944 Coiled helical springs - Sampling inspection
NB/T 47008 Carbon steel and alloy steel forgings for pressure equipment
NB/T 47009 Alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013 (all parts) Nondestructive testing of pressure equipments
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1.1
gas pressure regulator
equipment whose function is to automatically regulate the gas outlet pressure to maintain it within certain pressure range
3.1.2
series of pressure regulator
generic term for pressure regulators with the same design concept, similar structure but different nominal diameter
3.1.3
direct acting pressure regulator
pressure regulators which have a direct control by virtue of the outlet pressure variation over the actuator which drives the control members to move
Note: See Figure 1 for an example of the action principle of the direct acting pressure regulator.
Contents of GB 27790-2020
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Classification and model
4.1 Classification
4.2 Model
5 Structure and material
5.1 General requirements
5.2 Structure
5.3 Materials
6 Requirements
6.1 Appearance
6.2 Strength of pressure containing part
6.3 Inspection for finished product of diaphragm
6.4 External seal
6.5 Performance
6.6 Flow coefficient, Cg
6.7 Adaptability at limit temperature
6.8 Durability
6.9 Failure state
6.10 Performance of integrated shut-off device
6.11 Performance of integrated monitor
6.12 Performance of integrated release device
6.13 Torsion resistance and bending resistance of meter pressure regulator
7 Test methods
7.1 General requirements
7.2 Appearance
7.3 Strength of pressure-bearing parts
7.4 Inspection of finished diaphragm
7.5 External seal
7.6 Performance
7.7 Flow coefficient Cg
7.8 Adaptability at limit temperature
7.9 Durability
7.10 Failure state
7.11 Integrated shut-off device
7.12 Integrated monitor
7.13 Integrated release device
7.14 Torsion resistance and bending resistance of meter pressure regulator
8 Inspection rules
8.1 Inspection classification
8.2 Inspection items
8.3 End-of-manufacturing inspection
8.4 Type inspection
8.5 Judging rules
9 Marking, label and operating instructions
9.1 Marking and label
9.2 Operating instructions
10 Packaging, transport and storage
10.1 Packaging
10.2 Transport
10.3 Storage
Annex A (Normative) Physical and mechanical properties of rubber materials and gas resistance
Annex B (Informative) Storage of rubber parts of pressure regulators
Annex C (Normative) Alternative method for determining flow coefficient of mass flow regulators
Annex D (Informative) Flow characteristic
Annex E (Informative) Noise
