Abstract: A method of assembling a fluid end includes inserting a valve through a bore of a housing of the fluid end and into an interior volume of the fluid end, inserting a valve cover into the bore such that the valve cover seals the bore, and coupling a lock cover to the housing, the lock cover positioned over the bore to prevent removal of the valve cover from the bore. When the lock cover is coupled to the housing, the lock cover does not apply a preload against the valve cover.

Abstract: A wear plate assembly of a drill pump includes a wear plate extending between a first axial end and a second axial end. The wear plate includes an annular cross-section defined by a bore surface and a radial seal surface, an annular seal groove in the radial seal surface at a position between the first axial end and the second axial end, and a shoulder extending radially outward from the radial seal surface at the second axial end.

Abstract: A fluid end assembly of a hydraulic fluid pump includes a housing having a first housing bore and a second housing bore offset axially from the first housing bore. A plate is fastened to the housing. The plate has a first plate bore axially aligned with the first housing bore and a second plate bore axially aligned with the second housing bore. A first removable valve cover closes the first housing bore and a second removable valve cover closes the second housing bore. A first retainer engages the first plate bore and abuts the first removable valve cover and a second retainer engages the second plate bore and abuts the second removable valve cover.

Abstract: A method of assembling a fluid end includes inserting a valve through a bore of a housing of the fluid end and into an interior volume of the fluid end, inserting a valve cover into the bore such that the valve cover seals the bore, and coupling a lock cover to the housing, the lock cover positioned over the bore to prevent removal of the valve cover from the bore. When the lock cover is coupled to the housing, the lock cover does not apply a preload against the valve cover.

Abstract: A well servicing pump includes a power end and a fluid end operably coupled to the power end. The fluid end includes a casing that defines at least one pumping chamber, the pumping chamber at least partially defined by a spherical wall, and a first cylindrical wall extending along a first axis and defining a portion of a power end bore, the first cylindrical wall intersecting the spherical wall to define a first interface edge. A second cylindrical wall extends along a second axis and defines a portion of a discharge bore, the second cylindrical wall intersecting the spherical wall to define a second interface edge, and a third cylindrical wall extends along a third axis and defines a portion of a suction bore, the third cylindrical wall intersecting the spherical wall to define a third interface edge, wherein the first axis, the second axis, and the third axis are arranged between 100 and 140 degrees with respect to one another.

Abstract: A piston rod assembly of a hydraulic fluid pump includes an extension rod extending axially between a first axial end and a second axial end. The extension rod is defined by a first portion, a second portion, and a third portion. The first portion extends from the first axial end to the third portion and the second portion extends from the second axial end to the third portion. The piston rod assembly further includes a sleeve extending around the third portion. The sleeve is configured to couple the first portion to the second portion.

Abstract: A pump including a housing defining a plurality of inlet bores. A first interior wall is arranged to at least partially define a first of the plurality of inlet bores. The first interior wall has a contour in a cross section taken normal to the plunger axes. The first interior wall is at least partially defined by the revolution of the contour about a first inlet axis that is normal to and intersects a first of the plurality of plunger axes. The contour includes a cylindrical portion arranged parallel to the first inlet axis, a planar portion extending in a direction perpendicular to the first inlet axis and spaced a first distance from the plunger axis, and a convex bulge portion extending from the cylindrical portion and spaced a second distance from the plunger axis. The contour further includes a V-shaped groove portion extending from the convex bulge portion.

Abstract: A tunnel-style crankshaft assembly is provided having counterweights that serve the purposes of retaining the axial motion of bearings and improving the balance of the crankshaft assembly as a result of having a structure of an increased radial profile. The counterweights can include a mass section and a bearing retaining section. When the counterweight is secured to a crank web, the mass section of the counterweight is axially spaced from a bearing assembly disposed around the web. Therefore, the mass section of the counterweight may extend radially beyond an inner race of the bearing assembly without contacting the bearing assembly's cage. The mass section of the counterweight does not extend radially beyond a radial envelope of a crankshaft support surface thereby permitting the crankshaft assembly to be slidingly inserted into the crankcase.