Importance

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Abstract

A valve device comprises a vertical, tubular housing, a vertical valve member in the housing, and a coil-form compression spring encircling the member and urging it upwardly against a valve seat in the housing lower end. The member includes an upper, obturating portion and a lower, closure portion and its internal surface includes an upper annular part which diverges downwardly at a gradually increasing angle away from the location of the obturating portion in the valve closed condition. The internal surface includes a lower annular part converging downwardly at a substantial angle to the housing axis and situated directed radially outwards of the spring. Below the seat is an outlet mouth encircled by a rim, the closure part having a bottom lip at such clearance relative to the rim that, shortly before the closure part seals against the seat, the rim and the lip act shearingly upon liquid therebetween. The member includes three guiding fins in sliding contact with the internal surface. The seat may consist of moulded-in elastomeric material.

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First Claim