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Reciprocating pump assembly

  • US 9,695,812 B2
  • Filed: 04/28/2014
  • Issued: 07/04/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A reciprocating pump assembly, comprising:

  • a power end housing;

    a fluid end housing having a vertical bore intersected by a crossbore, the vertical bore including a suction valve and a discharge valve to facilitate fluid flow through the fluid end housing;

    a cylinder having at least a portion within the power end;

    a plunger assembly reciprocating between the power end housing and the fluid end housing of the pump assembly, the plunger assembly having a crosshead, a first section secured to the crosshead and limited to movement within the power end and a second section moveable within the crossbore of the fluid end housing, the second section secured against the first section by a retainer member disposed inside the first and second sections;

    a seal housing disposed within the cylinder, the seal housing having a proximal end adjacent an entrance to the cylinder, and a distal end disposed within the cylinder,a power end seal secured to the seal housing proximate the distal end;

    a fluid end seal disposed within the crossbore of the fluid end housing;

    wherein the power end seal sealingly engages an outer surface of the first section and the fluid end seal sealingly engages an outer surface of the second section such that during the reciprocating movement of the plunger assembly, fluid end proppant is deterred from contaminating the outer surface of the first section and thus, contaminating the power end seal; and

    wherein the retainer member is configured to secure the first section and the second section to the cross-head.

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