GB/T 26712-2021 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 26712-2021 | English | 260 |
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Supply stops for sanitary appliance and steam pipe
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| GB/T 26712-2011 | English | 559 |
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Supply stops for sanitary appliance and steam pipe
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GB/T 26712-2021: Supply stops for sanitary appliance and steam pipe---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT26712-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140
CCS Y 71
Replacing GB/T 26712-2011
Supply stops for sanitary appliance and steam pipe
Issued on: AUGUST 20, 2021
Implemented on: MARCH 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Classification and marking... 7
5 Conditions of use... 8
6 Materials... 8
7 Requirements... 8
8 Test methods... 12
9 Inspection rules... 15
10 Marking, packaging, transportation and storage... 18
Appendix A (Normative) Product type and size... 20
Appendix B (Normative) Thread axis angle test device... 24
Supply stops for sanitary appliance and steam pipe
1 Scope
This document specifies the terms and definitions, classification and marking,
conditions of use, materials, requirements, test methods, inspection rules, marking,
packaging, transportation and storage of supply stops for sanitary appliance and steam
pipe.
This document applies to angle valves used in water supply pipes or heating pipes
installed in buildings.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 1176, Casting copper and copper alloys
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1.Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 2829, Sampling procedures and tables for periodic inspection by attributes
(apply to inspection of process stability)
GB/T 5231, Designation and chemical composition of wrought copper and copper
alloys
GB/T 6461-2002, Methods for corrosion testing of metallic and other inorganic
coatings on metallic substrates - Rating of test specimens and manufactured
articles subjected to corrosion tests
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 7307, Pipe threads with 55 degree thread angle where pressure-tight joints
are not made on the threads
GB/T 8170-2008, Rules of rounding off for numerical values & expression and
judgment of limiting values
GB/T 10125-2012, Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 20878-2007, Stainless and heat-resisting steels - Designation and chemical
composition
GB/T 31586.2-2015, Corrosion protection of steel structures by protective paint
systems - Assessment of, and acceptance criteria for, the adhesion/cohesion
(fracture strength) of a coating - Part 2.Cross-cut testing and ×-cut testing
GB/T 33733, Terminology and classification for the kitchen and sanitary ware
fittings
QB/T 5419-2019, General specification for coatings of kitchen & sanitary
hardware
QB/T 5525, Limits and test methods for hazardous substances extraction in
kitchen and sanitary hardware products
3 Terms and definitions
For the purposes of this document, the following terms and definitions, as well as those
given in GB/T 33733, apply.
3.1
angle valve for sanitary coming into drinking water
Angle valve for sanitary appliance installed on drinking water pipes (such as the front
end of basin faucets, kitchen faucets and other water supply appliances).
3.2
angle valve for cool water
Angle valve suitable for water temperature not higher than 50 ℃.
3.3
angle valve for hot water
Angle valve suitable for water temperature higher than 50 ℃.
4 Classification and marking
4.1 Classification
4.1.1 Divided into angle valve for sanitary appliance and angle valve for steam pipe
according to their use. The codes are as specified in Table 1.
4.1.2 The valve body material in contact with water is divided into copper alloy,
stainless steel, plastic, ceramic and others. The codes are as specified in Table 2.
4.1.3 Divided into internal thread and external thread according to the thread type of
the water inlet end. The codes are as specified in Table 3.
4.1.4 Divided into DN15, DN20 and DN25 according to the nominal size of the water
inlet end.
4.1.5 Divided into rotary type and push type according to the flow opening and closing
control method.
4.2 Marking
Angle valves are marked as follows.
Example 1.The angle valve for sanitary coming into drinking water, whose valve body
material is copper alloy, connection is external thread, nominal size is DN15, is marked
as "JWY-TW15 GB/T 26712-2021".
Example 2.The angle valve for steam pipe, whose valve body is stainless steel,
connection is external thread, nominal size is DN20, is marked as "JN-BW20 GB/T
26712-2021".
5 Conditions of use
The product shall be able to be used normally under the conditions specified in Table 4.
6 Materials
6.1 Materials used in products that come into direct contact with water shall not pollute
the water quality under the conditions of use specified in this document. Zinc alloys
and other easily corrosive materials are not permitted to be used.
6.2 Cast copper materials shall comply with the provisions of GB/T 1176; processed
copper materials shall comply with the provisions of GB/T 5231.
6.3 Stainless steel materials shall be 06Cr19Ni10 specified in GB/T 20878-2007 or
other stainless-steel materials with corrosion resistance not inferior to the above
designations.
6.4 Other materials shall meet the performance requirements.
7 Requirements
7.1 Appearance
7.1.1 The casting surface shall be free of obvious defects such as scratches, dents,
shrinkage cavities, sand-holes, sharp edges, burrs, cracks and pores.
7.1.2 The surface of plastic parts shall not have obvious defects such as filler spots,
ripples, overflow, shrinkage marks, warping, weld marks, etc.
7.1.3 The electroplated surface shall have a uniform gloss and shall not have defects
such as peeling, cracking, burning, exposed bottom, flaking, black spots, obvious
pitting, burrs, etc.
7.1.4 The sprayed surface shall have firm adhesion and uniform color, and shall not
have obvious defects such as sagging, paint accumulation and exposed bottom.
7.1.5 The polished surface shall be smooth and free of obvious burrs, scratches, etc.
7.2 Processing and assembly
7.2.1 The external sealing pipe threads of the product shall comply with the provisions
of GB/T 7306.1 or GB/T 7306.2; the external non-sealing pipe threads of the product
shall comply with the provisions of GB/T 7307, and the external thread shall not be less
than the Class B accuracy of GB/T 7307.
7.2.2 The thread surface shall not have obvious defects such as dents and broken teeth,
and the surface roughness (Ra) shall not exceed 6.3 μm.
7.2.3 The maximum deviation of the angle between the axes of the two connecting
threads on the valve body shall not exceed 2°.
7.2.4 The product shall be easy and smooth to open and close without any obstruction;
the rotary angle valve shall be closed by rotating it in a clockwise direction and opened
by rotating it in a counterclockwise direction.
7.2.5 Metal chips, impurities, etc. attached to the inner cavity of the product shall be
cleaned out.
7.3 Dimensions
The dimensions of the product shall comply with the provisions of Appendix A.
7.4 Resistance to operational load
7.4.1 Push-type angle valve
Carry out the test according to 8.4.1.After withstanding an axial pressure of 250 N ± 5
N, there shall be no permanent deformation or damage, and the sealing performance
shall comply with the requirements of 7.9.1.
7.4.2 Rotary angle valve
Carry out the test according to 8.4.2.After withstanding a torque of 4.0 N·m ± 0.5 N·m,
no part of the valve body shall be permanently deformed or damaged, and the sealing
performance shall comply with the requirements of 7.9.1.
7.5 Anti-installation load
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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