Minimum allowable values of water efficiency and water efficiency grades for showers
1 Scope
This standard specifies the water efficiency grade, technical requirements and test methods for shower.
This standard is applicable to the water efficiency evaluation of showers (including shower head or its combinations) used in sanitary facilities such as lavatories (restrooms, bathrooms) and shower rooms installed in buildings with nominal pressure (static pressure) not greater than 1.0 MPa and medium temperature of 4℃~90℃.
It is not applicable to the shower with heating apparatus and with constant temperature.
2 Normative references
The following referenced documents are indispensable for the application 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 33733 Terminology and classification for the kitchen and sanitary ware fittings
3 Terms and definitions
For the purposes of this document, the terms and definitions established in GB/T 33733 and the following apply.
3.1
uniformity of flow
ΔF
the difference between the highest average flow and the lowest average flow of the hand-held shower head under different test pressures
3.2
minimum allowable values of water efficiency for showers
the maximum allowable flow of the shower under the test conditions specified in the standard
3.3
evaluating values of water conservation for showers
the maximum allowable flow of water-conservation shower under the test conditions specified in the standard
Note: The evaluating values of water conservation is a requirement for evaluating the water-conservation shower.
