Patent ID: 7997459

Claim:
A metering valve suitable for dispensing a pressurised product 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 the product 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 valve 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 metering valve further comprises a sealing gasket located, in use, between the valve body and the container to which the metering valve is attached and wherein at least one of the sealing gasket or the inner seal is formed as a co-moulding with at least a part of the valve body or the valve stem, respectively, the valve stem further comprising an annular flange, the inner seal being located between the flange and an end of the spring, the inner seal extending radially beyond the flange, and wherein the spring contacts the inner seal, and wherein an outer edge of the inner seal is a disc-like seal, surrounding and extending outwardly from the valve stem, and deflectable to allow pressure filling of the container to which the valve is attached, the product, while on route to pressure filling the container, passing around the deflected edge of the inner seal along a clearance space provided between the inner seal and a smaller diameter portion of the inner surface of the valve body.