GB 28379-2022Minimum Allowable Values of Water Efficiency and Water Efficiency Grades for Flush Valves of Plumbing Fixtures (English PDF)
卫生洁具 便器冲洗阀水效限定值及水效等级
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Issued by
SAMR / SAC
Level / Type
National · Mandatory
Issue date
December 29, 2022
Implementation date
July 1, 2023
Scope
GB 28379-2022 is the English-translated version of 卫生洁具 便器冲洗阀水效限定值及水效等级.
Specifies water efficiency grades, minimum allowable values, technical requirements, and test methods for flush valves used on squatting pans and urinals installed on cold water supply pipelines in buildings.
Document preview — GB 28379-2022
National Standard of the People's Republic of China
- ICS
- 91.060
- Replacing
- GB 28379-2012
Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Contents
- Foreword2
- 1 Scope3
- 2 Normative References3
- 3 Terms and Definitions3
- 4 Water Efficiency Grades for Flush Valves of Plumbing Fixtures
- 5 Technical Requirements5
- 6 Test Methods5
- Appendix A Plumbing Fixtures for Test
Foreword
This document was drafted in accordance with the rules of GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB 28379-2012 Minimum Allowable Values of Water Efficiency and Water Efficiency Grades for Flush Valve for Water Closets. In comparison with GB 28379-2012, apart from structural adjustments and editorial modifications, the main technical changes are as follows:
a) The scope of application is modified from “mechanical flush valves for water closets, pressure-type flush valves for water closets and non-contact flush valves for water closets” into “flush valves for plumbing fixtures” (see Chapter 1; Chapter 1 of Version 2012);
d) Test and calculation are modified (see Chapter 6; Chapter 5 of Version 2012);
Please be noted that certain content of this document may involve patents. The institution issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by and shall be under the jurisdiction of Standardization Administration of the People’s Republic of China.
This document was firstly issued in 2012. This is the first revision.
1 Scope
This document specifies the minimum allowable values of water efficiency and water efficiency grades, technical requirements and test methods for flush valves of squatting pans and urinals.
This document is applicable to flush valves of squatting pans and urinals installed on cold water supply pipelines in building facilities and used under the condition that the static pressure of the water supply is not greater than 0.6 MPa.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
3 Terms and Definitions
The terms and definitions defined in GB/T 9195, GB 28377, GB 30717 and GB/T 33733, and the following terms and definitions are applicable to this document.
3.1 flush valves of plumbing fixtures
Flush valves of plumbing fixtures are the control device for implementing the flushing function of the plumbing fixtures and a form of flush valve.
3.2 consumption of flushing water
Consumption of flushing water refers to the total flow of water from the moment that the flush valve is opened to the moment that it is fully closed.
Minimum allowable values of water efficiency for flush valves of plumbing fixtures refer to the maximum consumption of flushing water allowed by the flushing valves under the test conditions specified in the Standard.
4 Water Efficiency Grades for Flush Valves of Plumbing Fixtures
There are three water efficiency grades for flush valves, of which, Grade-1 water efficiency is the highest. The consumption of flushing water of each grade of flush valves shall comply with the stipulations of Table 1.
In each water efficiency grade, the average half-flush flushing water consumption of double-flush valves for squatting pans shall not be greater than 70% of the maximum limit value of the full-flush flushing water consumption.
5 Technical Requirements
5.1 Basic Requirements
The requirements of the expressly implemented standards shall be satisfied.
5.2 Requirements for Flushing Function
After the flush valves with the explicitly matched plumbing fixtures are installed with the matching plumbing fixtures, and after the flush valves without the matching plumbing fixtures are installed with the test plumbing fixtures specified in Appendix A, they shall comply with the corresponding requirements for the flushing function of plumbing fixtures.
The minimum water efficiency required by the minimum allowable values of water efficiency for flush valves of plumbing fixtures is Grade-3 water efficiency in Table 1.
6 Test Methods
6.1 Test
6.2 Calculation
V---the average flushing water consumption of double-flush valves, expressed in (L);
V1---the arithmetic mean of full-flush flushing water consumption of double-flush valves, expressed in (L);
V2---the arithmetic mean of half-flush flushing water consumption of double-flush valves, expressed in (L).
The dynamic pressure of water supply for the test is (0.1 ± 0.01) MPa, the peak flow rate is (95 ± 4) L/min, and the dynamic pressure of the pipeline after connecting the squatting pan for the test shall be 0.12 0 MPa. -0.01 Sectional diagram of squatting pans for the test Top-view diagram of squatting pans for the test The squatting pan used for the test shall be made of porcelain, the water-contact surface shall be smooth, and the inner wall of the sewage pipe shall be covered with an enamel layer.
Appendix A Plumbing Fixtures for Test
A.1 Squatting Pans for Test
During the test of the consumption of flushing water of flush valves without matching squatting pans, the squatting pans for the test are shown in Table A.1. The dynamic pressure of water supply for the test is (0.1 ± 0.01) MPa, the peak flow rate is (15 ± 0. […]
A.2 Urinals for Test
During the test of the consumption of flushing water of flush valves without matching urinals, the urinals for the test are shown in Table A.2, Table A.3 and Table A.4. The dynamic pressure of water supply for the test is (0.1 ± 0.01) MPa, the peak flow rate is (15 ± 0.5) L/min, and the dynamic pressure of the pipeline after connecting the urinal (without retaining weir) for the test shall be (0.1 ± 0.05) MPa. The flush-hole urinals used for the test (without retaining weir) shall be made of porcelain, the water-contact surface shall be smooth, and the inner wall of the sewage pipe shall be covered with an enamel layer. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.
Referenced standards
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