US 11,859,643 B2
Retainer nut assembly for pump and methods
Richard D. Peer, Crowley, TX (US)
Assigned to SPM Oil & Gas Inc., Fort Worth, TX (US)
Filed by SPM Oil & Gas Inc., Fort Worth, TX (US)
Filed on Nov. 19, 2021, as Appl. No. 17/531,019.
Prior Publication US 2023/0160402 A1, May 25, 2023
Int. Cl. F15B 15/26 (2006.01); F04B 53/14 (2006.01); F04B 51/00 (2006.01)
CPC F15B 15/26 (2013.01) [F04B 51/00 (2013.01); F04B 53/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A retainer nut assembly for a fluid end of a pump system, comprising:
a fastener comprising a generally cylindrical configuration, a first end and a second end opposite the first end, external threads configured to engage corresponding threads of a fluid end block, and a cavity formed at the first end;
a suction cap configured to sealingly fit to the fluid end block, the suction cap including a first portion configured to engage an internal shoulder of a counterbore of the fluid end block and a second portion configured to be disposed in a reduced-diameter portion of the counterbore;
a load piston movably disposed in the cavity and adjacent the suction cap, wherein the load piston is substantially a solid disk with a radius that is greater than a radius of the second portion of the suction cap;
a bore formed in the fastener in communication with the cavity and provided with a hydraulic fluid;
a pressure piston movably disposed in the bore,
wherein movement of the pressure piston, in the bore, is parallel to movement of the load piston in the cavity;
a threaded passageway formed in the fastener in communication with the bore and open to the second end; and
a locking bolt disposed in the threaded passageway, the locking bolt configured to contact the pressure piston and generate fluid pressure on the load piston with the hydraulic fluid,
wherein movement of the locking bolt, in the threaded passageway, is parallel to movement of the pressure piston and the load piston.