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See Chinese contents: GB 28379-2022 GB 28379-2022: Minimum allowable values of water efficiency and water efficiency grades for flush valves of plumbing fixtures
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.
