Patent ID: 8678248

Claim:
A metering valve for dispensing pressurized fluid, the metering valve comprising: a valve body having an inner wall contiguously formed coaxially with an outer wall along a main axis A; a radial space defined between the coaxial inner and outer walls along the length of the main axis; a valve chamber defined within a circumference of the inner wall and an inlet into the valve chamber communicating with a connecting passage for communicating with a product reservoir; a seal ring positioned in the valve chamber; a valve stem; a valve spring inserted into the valve chamber and between the seal ring and valve stem; the seal ring is positioned adjacent the inlet to the valve chamber and the seal ring comprises a hollow cylindrical main body having an outer surface with a substantially flat profile to frictionally engage with a wall of the valve chamber and a radially inward extending embossment tapering to a cylindrical surface providing an interfering engagement with the valve stem; and wherein said seal ring is provided with one of a concave and convex inner surface axially spaced from below the inward extending embossment.