Abstract: Fluid end for high pressure reciprocating pump, in particular for hydraulic fracturing pumps, comprising: a body having a first bore (18) for receiving a reciprocating plunger (31), a second bore (19) for accommodating a suction valve (41), and a third bore (21) for accommodating a discharge valve (43), the second bore (19) and the third bore (21) being perpendicular to the first bore (18); at least a tubular sleeve (30) in said first bore (18); at least a tubular cartridge (30) in the second bore and/or third bore; and a fluid tight seal between contacting surfaces of said sleeve (30) and said cartridge (30).

Abstract: This application describes systems for protecting steel fluid end body flow passages from direct impingement by high pressure fracking fluid. This fluid end body flow passages are protected by components in the form of cartridges and sleeves in one embodiment, a sleeve in another embodiment and a sleeve with dual cartridges in a further embodiment. This disclosure also describes kits which utilize these systems to provide enhanced erosion and corrosion resistance as well as improved fatigue properties and extended service life to these fluid ends.

Abstract: This application describes systems for protecting steel fluid end body flow passages from direct impingement by high pressure fracking fluid. These fluid end body flow passages are protected by components in the form of cartridges and sleeves, This disclosure also describes kits and methods which utilize these systems to provide enhanced erosion and corrosion resistance as well as improved fatigue properties and extended service life to these fluid ends.