Abstract: A retainer nut assembly for a fluid end of a pump system includes a fastener with a generally cylindrical configuration, first and second ends, external threads configured to engage corresponding threads of a fluid end block, and a cavity formed at the first end. A suction cap is configured to sealingly fit to the fluid end block. A load piston is movably disposed in the cavity adjacent the suction cap. A bore is formed through the fastener in communication with the cavity and provided with hydraulic fluid. A pressure piston is movably disposed in the bore. A threaded passageway is formed through the fastener in communication with the bore and open to the second end. A locking bolt is disposed in the threaded passageway and, when inserted into the threaded passageway, contacts the pressure piston and generates fluid pressure on the load piston.

Abstract: A fluid end includes a fluid end block defining a chamber. A plunger is disposed in the chamber. An outlet fluid passage is formed in the fluid end block in communication with the fluid chamber. An inlet fluid passage formed in the fluid end block communicates with the fluid chamber. The inlet fluid passage includes a seat, an enlarged diameter downstream from the seat, and a neck downstream of the enlarged diameter. The neck has a lesser diameter than the enlarged diameter. An inlet valve is movably disposed in the inlet fluid passage and is sized and shaped to seal against the seat. A biasing member has a first and second end with respective first diameter and a second diameter disposed within the enlarged diameter. The second end is positioned against the neck. The second end diameter is greater than the neck.

Abstract: A retainer nut assembly for a fluid end of a pump system includes a fastener with a generally cylindrical configuration, first and second ends, external threads configured to engage corresponding threads of a fluid end block, and a cavity formed at the first end. A suction cap is configured to sealingly fit to the fluid end block. A load piston is movably disposed in the cavity adjacent the suction cap. A bore is formed through the fastener in communication with the cavity and provided with hydraulic fluid. A pressure piston is movably disposed in the bore. A threaded passageway is formed through the fastener in communication with the bore and open to the second end. A locking bolt is disposed in the threaded passageway and, when inserted into the threaded passageway, contacts the pressure piston and generates fluid pressure on the load piston.

Abstract: A cementing swivel includes an outer stationary member having a cement port, an inner rotating member with a bore therethrough, and a torque indicating member coupled to the outer stationary member and configured to provide a visual indication that a predetermined torque load has been reached.