Cistern for flushing toilet may give large or small flush on demand and incorporates system for injecting air and has two separate operating buttons connected to control system by air line

摘要

The two control buttons (34,35) are connected to a common air line (33) connected to a valve control unit (32) with an air release valve (31). The valve has a pneumatic bag (41) and a spring (42). It is connected to an air release pipe (20). The cistern (11) has a double siphon arrangement and an air feed valve (27) and an air injector (28) in a filling pipe (26).