Patent ID: 8584700

Claim:
A discharge valve, comprising: a tubular, valve seat; a unitary valve guide being disposed above said valve seat, said valve guide including: a discharge passage plug, said plug being provided with a first circular recess in the bottom thereof; a guide rod being affixed to the bottom of said plug, said guide rod projecting downwardly from the center of said first circular recess; and, an interiorly threaded, lifting sleeve being affixed to, and projecting upwardly from, the top of said plug; a unitary piston being disposed between said valve seat and said valve guide, said piston including: a conical, head portion for engaging the top of said valve seat, said head portion being provided with a second circular recess in the top thereof; and, a stem portion being integrally affixed to said head portion, said stem portion projecting upwardly from the center of said second circular recess, said stem portion having a longitudinal socket within which said guide rod is slidably received, and said stem portion having a plurality of apertures therein, said apertures extending from said second circular recess to said socket; a compressed spring being disposed between said plug and said head portion for normally retaining said head portion in engagement with said valve seat, the top of said spring being disposed in said first circular recess and the bottom of said spring being disposed in said second circular recess, the spring being disposed around the apertures in the second circular recess of the stem portion; and, an externally threaded, valve retainer being disposed above said valve guide for pressing said valve guide toward said valve seat; wherein the stem portion has an outwardly sloping ledge to deflect the compressed spring away from the apertures adjacent the second circular recess.