Standard No.:	GB/T 37828-2019
English Name:	Bidirectional metal to metal sealed butterfly valve for urban heating
Chinese Name:	城镇供热用双向金属硬密封蝶阀
Chinese Classification:	P46    Heat supply and heating engineering
Professional Classification:	GB    National Standard
ICS Classification:	91.140.10 91.140.10    Central heating systems 91.140.10
Source Content Issued by:	SAMR; SAC
Issued on:	2019-08-30
Implemented on:	2020-7-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	10500 words
Translation Price(USD):	310.0
Delivery:	via email in 1 business day

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