Patent ID: 11971022
Assignee: GRACO MINNESOTA INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B | IPC F

Claim 18:
19. A pump for pumping an abrasive material, the pump comprising:
a pump body comprising:
an intake housing;
a valve housing mounted to the intake housing;
a pump cylinder mounted to an end of the valve housing opposite the intake housing;
an outlet housing mounted to an end of the pump cylinder opposite the valve housing; and
a throat cartridge mounted to an end of the outlet housing opposite the pump cylinder;

a first seal supported by the throat cartridge;
a piston at least partially disposed within the pump body and configured to reciprocate along a pump axis, the piston comprising:
a proximal rod;
an intermediate rod connected to the proximal rod; and
a distal rod connected to the intermediate rod at an opposite end of the intermediate rod from the proximal rod;

a first piston sleeve mounted on the proximal rod, wherein the first piston sleeve interfaces with the first seal during reciprocation of the piston, the first piston sleeve mounted in a first recess that extends axially between a first shoulder formed by the proximal rod and a second shoulder formed by the intermediate rod;
a second piston sleeve mounted on the distal rod and spaced axially from the first piston sleeve along the piston, the second piston sleeve mounted in a second recess that extends axially between a third shoulder formed by the distal rod and a fourth shoulder formed by a scoop assembly mounted to an end of the distal rod opposite the intermediate rod;
a cylinder sleeve mounted to the pump cylinder such that an interior radial surface is exposed within a material flowpath through the pump body;
an intake valve disposed within the pump body, wherein the intake valve includes an intake seal assembly disposed on the piston, wherein the intake seal assembly interfaces with the second piston sleeve during reciprocation of the piston, and wherein the intake valve is actuatable between a first open state with the intake seal assembly disengaged from an intake seat and a first closed state with the intake seal assembly engaged with the intake seat; and
a piston valve disposed within the pump body, wherein the piston valve includes a piston seal assembly disposed on the piston, wherein the piston seal assembly interfaces with the cylinder sleeve during reciprocation of the piston, and wherein the piston valve is actuatable between a second open state with the piston seal assembly disengaged from a piston valve seat and a second closed state with the piston seal assembly engaged with the piston valve seat.