Wear resistant pump valve

A fluid pressure energized pump valve, comprising:

• (a) a valve body;
• (b) a seal retainer element being threadedly secured to said valve body and cooperating therewith to define a circular sel receptacle;
• (c) a circular elastomeric sealing element being retained within said seal receptacle by said retainer element and forming a frusto-conical sealing surface adapted to engage a frusto-conical valve seat of corresponding configuration;
• and
• (d) an anti-extrusion member formed of non-metal material of greater hardness than the elastomeric material of said sealing element and being secured in assembly with said sealing element, said anti-extrusion member defining a frusto-conical sealing surface coextensive with said frusto-conical sealing surface of said sealing element for sealing engagement with said frusto-conical valve seat, said anti-extrusion member being located at the downstream portion of said circular elastomeric sealing element and forming a circular yieldable marginal lip at the intersection thereof with said frusto-conical sealing surface of said circular elastomeric sealing element, said circular yieldable marginal lip of said anti-extrusion member yielding radially outwardly responsive to pressure and establishing sealing engagement with said frusto-conical valve seat, providing structural support for said elastomeric sealing element and minimizing extrusion of said elastomeric sealing element.