Abstract: A metering dispenser including a metering chamber having an inlet port and an outlet port, an inlet valve for admitting flowable material to the metering chamber through the inlet port, an outlet valve for allowing discharge of the material. To control operation of the inlet and outlet valves, a valve control member is operatively associated with the inlet and outlet valves and is pivotally movable between two extreme limits of pivotal movement which correspond respectively to fill and discharge conditions of the dispenser. A control biasing spring is associated with the valve control member and biases the valve control member towards the one of the extreme limits of pivotal movement corresponding to the dispenser being in the fill condition. An actuator is operative to move the valve control member against the action of the biasing spring. The valve control may be mechanically operative to control operation of the inlet and outlet valves.

Abstract: A dispenser device for liquids including a metering chamber having a valve controlled inlet port and a valve controlled outlet port. An actuator is connected to the two valves to move them between fill and discharge conditions and is arranged to cause the inlet valve to close before opening the outlet valve during transfer from the fill to the discharge condition. The actuator includes a cylinder movable over a piston fixed to the body of the device and the valves respond to movement of the cylinder between two extreme positions corresponding to the fill and discharge conditions respectively. A biasing system urges the cylinder into the fill position at which the inlet valve is open and the outlet valve is closed, and a time delay arrangement operates to retard movement of the cylinder during part of its travel from the discharge position to the fill position.