SIPHON PROTECTED FLUID INLET VALVE

摘要

The invention relates to the protection of liquid storage systems such as W.C. cisterns against ongoing fluid loss. It provides an inlet valve waste preventer for incorporation in a fluid discharge system comprising a discharge valve (2) to be mounted inside, and to discharge through an outlet in the bottom of, a first cistern (1), a second cistern (9) containing a float (8) co-operating with an inlet valve (5) to control the level (16, 17) of the fluid in both the first and second cisterns and means to empty the second cistern (9) by siphonic action. The means to empty the second cistern (9) may be, for example a siphon-inducing device activated by fall in the fluid level (16) in the first cistern (1).