Patent ID: 8235044

Claim:
A rotary metering valve, comprising: a valve inlet; a valve outlet; a rotary valve member for transferring a metered dose of pressurized aerosol formulation from the valve inlet to the valve outlet, wherein the rotary valve member is provided with an inlet port and an outlet port, both in communication with a metering conduit in the rotary valve member, the rotary valve member in sequence being rotatable between at least three positions: an inlet position where the inlet port is in communication with the valve inlet and pressurized aerosol formulation enters the metering conduit, a metering position where both ports are closed preserving a metered volume of pressurized aerosol formulation in the metering conduit, and an outlet position where the outlet port is in communication with the valve outlet and the metered dose of pressurized aerosol formulation is dispensed from the valve.