Valve

Claim 1

A fluid discharge control means for an outlet port in a fluid storage tank comprising, a hollow manifold body of substantially inexpensive rectangular stock material, a hollow open ended inlet tube positioned in one side of the manifold body with the outer end of the inlet tube adapted to be secured to the tank outlet port, said inlet tube having an annular valve seat on its inner end, a valve mounting tube disposed in an opposed side of the manifold body opposite the inlet tube, a cavitiless valve assembly secured to the outer end of the valve mounting tube and extending into the body and including a head cap secured to the outer end of the valve mounting tube, said head cap having a stuffing box disposed centrally thereon, an elongated valve stem rotatively disposed in the stuffing box with the inner end of the stem being disposed adjacent and spaced from the inner end of the inlet tube, the outer end of the stem extending outwardly of the manifold body and head cap and having a handle thereon, a valve disc rotatively secured to the inner end of the stem and adapted to selectively engage said valve seat to control fluid flow thereby when said stem is rotated in one direction about its longitudinal axis, said valve disc having an annular groove formed in its side opposite said seat, and an annular gasket disposed in said groove and having a sealing surface centrally disposed on the gasket and adapted for sealing contact with said valve seat, said gasket in cross-sectional configuration having an air space centrally disposed in the surface opposite its sealing surface to provide a bubble-tight seal at low sealing pressures, said air pocket being disposed directly opposite said valve seat, the sidewalls of the groove first converging slightly toward each other, thence diverge away from each other to the groove opening to form a partial V-shaped groove in crosssectional configuration to retain the gasket therein and preclude separation of the gasket from such groove.