Patent ID: 7001160

Claim:
A valve comprising: a valve body comprised of a nonconformable material, said valve body having a bore extending therethrough, from the inlet port to the outlet port; an upper inwardly extending flange, said flange characterized by a bottom surface, a top surface, and a bore extending from the bottom surface to the top surface, said bottom surface serving as a valve seat; a plunger extending through the bore, said plunger having an upper segment of small diameter making the upper segment capable of moving through the bore of the upper inwardly extending flange, said plunger having a lower segment of larger diameter such that said lower segment cannot pass through the bore of the upper inwardly extending flange, said lower segment of the plunger having a frustoconical upper surface positioned in apposition to the bottom surface of the upper inwardly extending flange and a lower surface; and a ring comprising a conformable material disposed between the frustoconical upper surface of the lower segment and the upper inwardly extending flange, said ring being in contact with the frutoconical upper surface when seated.