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GB 28379-2022: Minimum allowable values of water efficiency and water efficiency grades for flush valves of plumbing fixtures
GB 28379-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.060
CCS Y 71
Replacing GB 28379-2012
Minimum Allowable Values of Water Efficiency and Water
Efficiency Grades for Flush Valves of Plumbing Fixtures
ISSUED ON: DECEMBER 29, 2022
IMPLEMENTED ON: JULY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Water Efficiency Grades for Flush Valves of Plumbing Fixtures ... 5
5 Technical Requirements ... 5
6 Test Methods ... 6
Appendix A (normative) Plumbing Fixtures for Test ... 7
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);
b) The term and definition of consumption of flushing water is added (see 3.2);
c) The indicators of water efficiency grades are modified (see Chapter 4; 4.3 and 4.4 of
Version 2012);
d) Test and calculation are modified (see Chapter 6; Chapter 5 of Version 2012);
e) The plumbing fixtures for the tests are added (see Appendix A).
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.
Minimum Allowable Values of Water Efficiency and Water
Efficiency Grades for Flush Valves of Plumbing Fixtures
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.
GB/T 9195 Classification and Terms of Building and Sanitary Ceramics
GB 28377 Minimum Allowable Values of Water Efficiency and Water Efficiency Grades for
Urinals
GB 30717 Minimum Allowable Values of Water Efficiency and Water Efficiency Grades for
Squatting Pans
GB/T 33733 Terminology and Classification for the Kitchen and Sanitary Ware Fittings
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
the corresponding requirements for the flushing function of plumbing fixtures.
5.3 Minimum Allowable Values of Water Efficiency for Flush Valves 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
6.1.1 The test of the average consumption of flushing water of flush valves of squatting pans
shall be carried out in accordance with the requirements of GB 30717.
6.1.2 The test of the average consumption of flushing water of flush valves of urinals shall be
carried out in accordance with the requirements of GB 28377.
6.1.3 The flush valves without matching plumbing fixtures shall be installed on the test
plumbing fixtures specified in Appendix A for testing.
6.2 Calculation
6.2.1 The average consumption of flushing water of single-flush valves is the arithmetic mean
of its measured flushing water consumption.
6.2.2 The average consumption of flushing water of double-flush valves shall be calculated in
accordance with Formula (1):
Where,
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).