Bidirectional metal to metal sealed butterfly valve for urban heating
1 Scope
This standard specifies the terms and definitions, designation and parameters, structure, general requirements, requirements, test methods, inspection rules, marking, protection, packaging, storage and transportation of bidirectional metal to metal sealed butterfly valve for urban heating (hereinafter referred to as "butterfly valves").
This standard is applicable to the butterfly valves for heating with a nominal pressure less than or equal to PN25, a nominal dimension less than or equal to DN1600, hot water temperature less than or equal to 200 °C, and steam temperature less than or equal to 350°C.
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 150.4 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 223 (all parts) Methods for chemical analysis of iron steel and alloy
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 985.1 Recommended joint preparation for gas welding, manual metal arc welding, gas-shield arc welding and beam welding
GB/T 985.2 Recommended joint preparation for submerged arc welding
GB/T 1047 Pipework components - Definition and selection of DN (nominal size)
GB/T 1048 Pipework components - Definition and selection of PN
GB/T 1220 Stainless steel bars
GB/T 3091 Welded steel pipes for low pressure liquid delivery
GB/T 8163 Seamless steel tubes for liquid service
GB/T 9113 Integral steel pipe flanges
GB/T 9119 Slip-on-welding plate steel pipe flanges
GB/T 9124 Specification for steel pipe flanges
GB/T 9711 Petroleum and natural gas industries - Steel pipe for pipeline transportation systems
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 valve - Specification of spheroidal graphite iron castings
GB/T 12230 General purpose industrial valves - Specification of stainless steel castings
GB/T 13927-2008 Industrial valves - Pressure testing
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB/T 30308 Fluoroelastomers - General specification and procedure of evaluation
GB/T 30832 Valves - Test method of flow coefficient and flow resistance coefficient
JB/T 106 Valves marking and paint
NB/T 47008 Carbon and alloy steel forgings for 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 47013.3-2015 Nondestructive testing of pressure equipment - Part 3: Ultrasonic 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
directional seal
sealed in both directions, i.e. the main sealing direction marked on the valve and the direction opposite to the main sealing direction
3.2
metal to metal seal
metal-to-metal structure as the sealing matching material of the seal holder and the wafer plate sealing face
3.3
breakaway thrust/breakaway torque
torque required to open and close the valve at maximum pressure difference
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Designation and parameters
5 Construction
6 General requirements
7 Requirements
8 Test methods
9 Inspection rules
10 Marking
11 Protection, packaging, storage and transportation
Annex A (Normative) Sleeve
Annex B (Normative) Axial force and bending moment values
Annex C (Normative) Bending moment test method
