Patent ID: 11859643
Assignee: SPM OIL & GAS INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 16:
17. A method of installing a retainer nut assembly into a fluid end block for a reciprocating pump system, the method comprising:
threading a fastener into the fluid end block;
tightening a locking bolt disposed in the fastener and engaged therewith via threads;
engaging and advancing a pressure piston disposed in a bore of the fastener with the locking bolt;
generating fluid pressure in the bore with the pressure piston;
applying the fluid pressure to a load piston; and
generating, with the load piston, a force on a suction cap installed in the fluid end block,
wherein the locking bolt, the pressure piston, and the load piston move in parallel,
wherein the suction cap includes 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, and
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.