Patent ID: 7997458
Filing Date: 2011-08-16
Classification: B65D

Abstract:
1. A metering valve for dispensing a pressurised formulation from a container and comprising a valve stem extending within and slidable relative to a cup shaped valve body, the valve stem extending through an outer seal closing off an open end of the valve body and carrying an inner seal, a clearance being provided between the outer surface of the inner seal and an inner surface of the valve body to provide a path for said formulation to enter a chamber within the valve body, and a spring urging the valve stem against the outer seal in which movement of the valve stem against the spring action causes the inner seal to engage part of the valve body to define a temporary metering chamber within the body between the outer seal and the inner seal and further depression of the valve stem allows product to flow from the metering chamber to atmosphere, the valve body being of stepped cylindrical configuration, the inner seal being within a larger diameter portion of the valve body in its rest position and slidably engaging a smaller diameter portion to form the metering chamber, the valve stem including an annular flange and the inner seal being located between the flange and an end of the spring such that the inner seal is held against the flange by the spring, and said inner seal having an outer edge that is deflectable by a pressure filling fluid to allow pressure filling of the container to which the valve is attached by allowing a flow of pressure filling fluid to pass between the deflected outer edge of the inner seal and the valve body.