Molded nosecup valve assembly

Claim 1

A valve for a flexible nosecup of a gas mask comprising a resiliently deformable valve seat molded integrally with the nosecup, the valve seat being of substantially thicker material than the nosecup, substantially circular, and having a central hub with an aperture therethrough; a resilient valving element with a circular central panel and a stem extending at one side from the centre of the panel; and a plurality of spokes radially extending from the central hub to said valve seat to form apertures between adjacent spokes from one side of the valve body to the other, charaterised by a rim surrounding the central panel and projecting therefrom on the same side of the central panel from which the stem extends, such that when the valve is assembled with the stem through the aperture in the central hub and the valve is closed, the central panel will become concave in a direction away from said seat to resiliently bias the edge of the rim into forceable contact with the valve seat to maintain the valve closed in response to deformation of the resilient deformable valve seat.