Abstract: A metering valve for liquids to be dispensed in doses of fixed amount has a metering chamber of fixed volume which is intended to be filled with the liquid when the container is inverted and the operating valve is partially opened. After the metering chamber has had its contents discharged by the valve being fully opened, and the valve member is released to return to its valve-closed position, the chamber refills under gravity. When the container is replaced in its upright position, liquid is prevented from flowing back into the container by an effective one-way valve. This may be provided by an O-ring or similar mechanical barrier to flow, or the flow passage may be dimensioned so that capillary forces prevent gravity being able to allow gas or vapor in the ullage space to displace the liquid in the metering chamber. By these structures the container remains capable of dispensing the desired fixed amount of liquid immediately after it is inverted and the operating member is operated.