Abstract: The present invention is directed to use of a combined seal involving a compression seal coupled with a metal-to-metal seal for use on the suction and discharge side of the plunger portion of a reciprocating pump. This combined seal results in less vibratory movement and better pumping during use of the pump, and an overall more efficient pump based on the improved seal.

Abstract: Disclosed herein is a packing nut lock for a fluid end assembly of a reciprocating pump. The fluid end assembly includes a fluid end block component, a set screw which may have a pointed end, and a packing nut. The set screw engages or interlocks between the a first and second thread of a threaded bore to prevent displacement of the packing nut from the threaded bore.

Abstract: Disclosed herein is an improved fluid end discharge cap and bore to minimize or avoid cavitation during use of a reciprocating fluid end pump and hence prolong the use and life of the fluid end assembly. The improved design included modifying the current cylindrical discharge cover or cap to a tapered, conical or convex design, enlarging the discharge bore, and recessing seat decks into the suction and discharge bores, to avoid fluid flow obstructions and increase volume flow. The pump outlet bore was enlarged and the bore height and diameter were increased to further increase flow. The conventional design has edges and ninety-degree angles which tended to allow for fluid media to remain in the bore and trigger pump cavitation. The current inventive design has eliminated restrictions, in particular 90° angles, to allow uninterrupted fluid flow therein.