GB 25502-2024 Minimum allowable values of water efficiency and water efficiency grades for water closets
1 Scope
This document specifies the water efficiency grade, technical requirements, test method and test device for water closets.
This document is applicable to water closets installed on cold water pipelines in building facilities, with water as the main flushing medium, capable of water sealing and incapable of warm water cleaning.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 6952 Sanitary wares
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9195 Terms and classification of building and sanitary ceramics
GB/T 20810 Toilet tissue paper (including toilet tissue base paper)
GB 28379 Minimum allowable values of water efficiency and water efficiency grades for flush valves of plumbing fixtures
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 6952, GB/T 9195, GB 28379 and the following apply.
3.1
minimum allowable values of water efficiency for water closet
maximum allowable flushing water consumption of the water closets which comply with the stated executive standard under specified test conditions
4 Water efficiency grade for water closets
Water efficiency grades for water closets are classified into 3 grades, among which Grade 1 represents the highest water efficiency. The flushing water consumption of water closets of various grades shall be as specified in Table 1.
The water efficiency grade for baby water closets, that is, the height of the seat from the ground is less than 370 mm, are classified into 2 grades, among which Grade 1 represents higher water efficiency. For the baby water closets, the flushing water consumption of various water efficiency grades shall comply with Grade 1 or 2 water efficiency in Table 1.
5 Technical requirements
5.1 Basic requirements
The water closets shall meet the requirements of the stated executive standard.
5.2 Minimum allowable values of water efficiency for water closet
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Water efficiency grade for water closets
5 Technical requirements
6 Test methods
7 Test device
Annex A (Normative) Schematic diagram of test device
Annex B (Normative) Acceptance procedure for discharge function test media
