Inlet valve mechanism

An interlock mechanism for a flush valve operated cistern having a flush valve in the base thereof which, when opened, drains water stored in said cistern to constitute a flush, said cistern further having an actuator mechanism interconnecting a flush actuator with said flush valve to open the latter on operation of said actuator, and an inlet valve having a refill actuator operable in response to the level of water in said cistern to refill same to a predetermined level, wherein said interlock mechanism comprising a latch means interconnected with said refill actuator and said flush actuator and operable to prevent refilling of said cistern, said latch means being releasable by operation of said flush actuator and being re-settable by initial re-filling of said cistern after a flush and wherein said refill actuator includes a first float linked to a float arm which is pivotally connected to said inlet valve and which is adjacent said actuator mechanism, said latch means comprises a pivoted lever extending between said float arm and said actuator mechanism and movable by operation of said actuator mechanism to move an abutment on said pivoted lever out of engagement with a stop member stationary relative to said cistern, and biasing means comprising gravity acting on said pivoted lever to return said abutment into engagement with said stop member following operation of said actuator mechanism, wherein said interlock mechanism further includes a latch securing mechanism comprising a second float mounted for movement with a pivoted locking lever and pivotable to bear against said pivoted lever with decreasing water levels in said cistern to secure said abutment and stop member in mutual engagement if said water level drops prior to actuation of said actuator mechanism.