Syphon-operated closet bowl flush tank

Abstract

A syphon-operated closet bowl flush tank of the kind comprising an inverted bell (10) containing a liftable plunger disc (12) to initiate syphon action has a flush control valve (14) comprising a tubular body part (16) mounted vertically in the top (18) of the bell and extending above the bell. The valve further has a stem (20) movable in and guided by the body part, is shaped to define a flow path (22) through the body part, and has lower (24) and upper (26) portions extending respectively below and above the top of the bell. The body part has a downwardly facing valve seat (25) inside the bell and the stem has an upwardly facing valve seat (31) co-operating with the downwardly facing seat to make a valve closure. An inverted bell float (38) is provided on the top of the stem. The body part includes a spring ring (30) carried in a flange (23) of the tubular body part so that the valve can be fitted to an existing bell by access from only the top of the bell. The valve permits the tank to be fully flushed or partially flushed depending on whether the plunger disc is retained lifted for the duration of the flush or is lifted and released immediately after the flush starts.