Patent ID: 11965497
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 7:
8. A fluid cylinder for a fluid end section of a reciprocating pump, the fluid cylinder comprising:
a body defining a plunger bore, the body having a first inner diameter threaded surface and a second inner diameter threaded surface;
a plunger sleeve having a first threaded profile configured for engagement with the first inner diameter threaded surface of the body, the plunger sleeve defining a throughbore configured to receive a plunger reciprocating within the plunger bore during operation of the reciprocating pump;
a packing assembly including at least one annular seal disposed between the plunger sleeve and the plunger;
a packing nut having a second threaded profile for engagement with the second inner diameter threaded surface of the body; and
a separate annular seal spaced from the packing assembly, the separate annular seal disposed between the plunger sleeve and the plunger bore,
wherein the first threaded profile and the second threaded profile are positioned in the fluid end section along offset interior surfaces of the body, and
wherein the packing nut and the plunger sleeve directly abut each other within the fluid end.