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GB/T 35842-2026: Technical requirements for pre-insulated directly buried valve of urban heating
Status: Valid
GB/T 35842: Evolution and historical versions
| Std ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status |
| GB/T 35842-2026 | English | 379 |
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Technical requirements for pre-insulated directly buried valve of urban heating
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| GB/T 35842-2018 | English | 439 |
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Technical requirements for pre-insulated directly buried valve of urban heating
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Standard similar to GB/T 35842-2026 GB/T 21087 | GB/T 38603 | CJ/T 395 | GB/T 47394 | GB/T 33833 | Basic data | Standard ID | GB/T 35842-2026 (GB/T35842-2026) | | Description (Translated English) | Technical requirements for pre-insulated directly buried valve of urban heating | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | P46 | | Classification of International Standard | 91.140.60 | | Date of Issue | 2026-01-28 | | Date of Implementation | 2026-08-01 | | Older Standard (superseded by this standard) | GB/T 35842-2018 | GB/T 35842-2026: Technical requirements for pre-insulated directly buried valve of urban heating---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 91.140.60
CCSP46
National Standards of the People's Republic of China
Replaces GB/T 35842-2018
Technical requirements for prefabricated direct-buried insulated valves for urban heating
valve of urban heating
Implemented on August 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4 General Requirements 2
5 Requirements 3
6.Test Methods
7 Inspection Rules 7
8.Marking, transport and storage 9.
Appendix A (Normative) Valve Sleeve 11
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document supersedes GB/T 35842-2018 "Technical Requirements for Prefabricated Direct-Buried Insulated Valves for Urban Heating" and is consistent with GB/T 35842-2018.
Aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope of application for steel valves has been changed and the scope of application for PE-RT II valves has been expanded (see Chapter 1,.2018 edition).
Chapter 1);
b) The terms and definitions for valve welded ports, switching torque, bending moment, and no-load conditions have been removed (see 3.3–3.6 of the.2018 edition);
c) The valve performance standard has been changed (see 4.2,.2018 version of 4.2);
d) The connection methods between the insulated valves and the pipelines have been increased (see 4.3);
e) The corrosion protection requirements for steel valve stems have been changed (see 4.4, 4.8 in the.2018 edition);
f) Valve sleeve requirements have been changed (see 4.5, 4.12 in the.2018 edition);
g) The requirements for valve structure, on/off conditions, application requirements for separable connections, valve stem structure and length, and O-ring requirements have been removed.
(See 4.3-4.7 in the.2018 edition);
h) Requirements for gear mechanisms, keyway requirements for actuator connections, valve stop device requirements, and insulation for steel butterfly and ball valves have been removed.
Gearbox disassembly and assembly requirements during valve manufacturing (see sections 4.9-4.11 and 4.14 of the.2018 edition);
i) The welding specifications for valve sleeves have been changed (see 4.6, 4.13 of the.2018 edition);
j) Added requirements for the welding and inspection of the outer protective tube (see 4.7);
k) The requirements for the signal lines of the thermal insulation valves have been changed (see 4.9, 5.2.11 in the.2018 version);
l) Valve requirements have been changed (see 5.1,.2018 version 5.1);
m) The requirements for the raw materials of the outer protective tube have been increased (see 5.2.1);
(n) Increased requirements for carbon black dispersion and carbon black content in the outer protective tube (see 5.2.5, 5.2.6);
o) The melt flow rate requirement for the outer sheath has been increased (see 5.2.10);
p) Increased requirements for the thermal stability of the outer protective tube (see 5.2.11);
q) The requirements for the location and stagger distance of the longitudinal weld seams in the outer protective pipe have been increased (see 5.2.13);
r) The requirement for the difference in length between the reserved sections at both ends of the PE-RTⅡ valve has been added (see 5.4.4);
s) The requirement for the increase in the outer diameter of the outer sheath after polyurethane foaming has been added (see 5.4.5);
t) The requirements for insulation layer thickness and axial eccentricity have been changed (see 5.4.6, 5.2.8 and 5.2.9 in the.2018 version);
u) A test method for the increase in outer diameter of the outer sheath after polyurethane foaming has been added (see 6.4.5);
v) The alarm line test method has been removed (see 6.2.11 in the.2018 version);
w) The sampling inspection requirements have been changed (see 7.2.4,.2018 version 7.2.4);
x) The tables for axial force and bending moment have been removed (see Appendix A of the.2018 edition);
y) The radial bending moment test method has been removed (see Appendix B of the.2018 edition);
z) Added provisions for valve sleeves (see Appendix A).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic of China.
This document is under the jurisdiction of the National Technical Committee on Standardization of Urban Heating (SAC/TC455).
This document was drafted by. Beijing Heating Equipment Manufacturing Co., Ltd., Beijing Heating Group Co., Ltd., and Shanghai Special Equipment Supervision and Management Bureau.
Inspection and Testing Technology Research Institute, Beijing Thermal Engineering Design Co., Ltd., Beijing Construction Engineering Quality Fourth Testing Institute Co., Ltd.
China Zhongyuan International Engineering Co., Ltd., Tangshan Xingbang Pipeline Engineering Equipment Co., Ltd., Dalian Yiduo Pipeline Co., Ltd., Haotian Energy-Saving Equipment
Limited Liability Company, Beijing Wexway Valve Co., Ltd., Dalian Kaiyuan Pipeline Co., Ltd., Tianjin Yugang Insulation Building Materials Co., Ltd.
Hebei Junye Technology Co., Ltd., China Nuclear Seventh Research and Design Institute Co., Ltd., China Northwest Municipal Engineering Design and Research Institute Co., Ltd.
Shandong Shanghe Engineering Design Co., Ltd., Tianjin International Machinery Co., Ltd., Hanwha Total Energy & Chemical (Shanghai) Co., Ltd., Beijing Songtian
Cheng Technology Co., Ltd., Rifeng New Materials Co., Ltd.
The main drafters of this document are. Han Chengpeng, Zhang Mingming, Zhang Yucheng, Guo Shujuan, Fu Minghai, Geng Haiyang, Feng Wenliang, Hu Quanxi, Qiu Huawei, and Wang Deyong.
Zheng Zhongsheng, Min Na, Wang Hao, Hao Zhizhong, Zhai Baohuan, Yan Bixing, Xu Jinsha, Li Deheng, Wang Kai, Zhang Jun, Yin Xianghan, Yin Minghui, Wang Qingbin, Zhao Qihui
Zuo Yanzhe, Huang Lianbing, Zhao Yue, Ye Xingbei.
This document was first published in.2018, and this is its first revision.
Technical requirements for prefabricated direct-buried insulated valves for urban heating
1 Scope
This document specifies the general requirements, requirements, test methods, and inspection procedures for prefabricated direct-buried insulated valves for urban heating (hereinafter referred to as "insulated valves").
Inspection rules, as well as marking, transportation, and storage.
This document applies to.
---The continuous operating temperature of the conveyed medium is not less than 4℃ and not more than 120℃, the occasional peak temperature is not more than 130℃, and the nominal size is...
Manufacturing and inspection of prefabricated steel insulated valves for direct burial and manhole applications with a diameter of DN1600 or less;
---Prefabricated Type II heat-resistant polyethylene insulated valves for direct burial and manhole applications with a continuous operating temperature of not exceeding 75℃ (hereinafter referred to as...)
Manufacturing and inspection of “PE-RTⅡ thermal insulation valve”.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 3091 Welded steel pipes for low-pressure fluid transportation
GB/T 8163 Seamless steel pipes for conveying fluids
GB/T 9711 Steel pipes for pipeline transportation systems in the oil and gas industry
GB/T 14976 Stainless steel seamless pipes for conveying fluids
GB/T 20674.1 Plastic pipes and fittings - Welding equipment for polyethylene systems - Part 1.Butt fusion
GB/T 20674.2 Plastic pipes and fittings - Welding equipment for polyethylene systems - Part 2.Electrofusion welding
GB/T 28799.2 Heat-resistant polyethylene (PE-RT) piping systems for hot and cold water - Part 2.Pipes
GB/T 28799.4 Heat-resistant polyethylene (PE-RT) piping systems for hot and cold water - Part 4.Valves
GB/T 28799.5 Heat-resistant polyethylene (PE-RT) piping systems for hot and cold water - Part 5.System suitability
GB/T 29046 Test Methods for Technical Indicators of Prefabricated Insulated Pipelines for Urban Heating
GB/T 29047 High-density polyethylene outer sheath rigid polyurethane foam prefabricated direct-buried insulated pipes and fittings
GB/T 37827 Welded ball valves for urban heating
GB/T 37828 Two-way metal hard-seal butterfly valve for urban heating
GB 50236 Construction Specification for Welding Engineering of On-site Equipment and Industrial Pipelines
3 Terms and Definitions
The terms and definitions defined in GB/T 29047 and the following terms and definitions apply to this document.
3.1
Insulated valve
Pipeline accessories consisting of a high-density polyethylene outer protective pipe, a rigid polyurethane foam insulation layer, valves, valve sleeves, etc.
3.2
Valve extension pipes
Straight pipe sections are welded to both ends of the valve body to facilitate valve insulation and installation.
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