Drainage valve for a toilet flushing system

摘要

To be able to empty a water tank (1) for a toilet flushing system partially or completely, as desired, provision is made for a drainage valve (2), of which the first closure element (10), which closes an outlet opening (4) in the base (5) of the tank, has, below the filling level (17) of the tank, an inlet opening (16) which is closed by a second closure element (18) which can be actuated independently of the first closure element. <IMAGE>