Flushing cisterns.

摘要

A flushing cistern to produce an energetic flush with a reduce volume of water, some 5 or 61 for low-level use. The cistern has a housing supporting a rotatable water holder having a large flow aperture in a curved surface and otherwise closly conforming to the inside of the housing. The flush outlet is a large tapering outlet of hydraulically-efficient form to which the aperture matches when the holder is rotated to produce a flush. The fitting of the water holder can be arranged to occur only when the holder is in the correct position. Fault conditions are indicated by a warning flow of water from an overflow or elsewhere.