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

Claim 0:
1. A pump for pumping an abrasive material, the pump comprising:
a pump body;
a first seal supported by the pump body;
a piston at least partially disposed within the pump body and configured to reciprocate along a pump axis;
a first piston sleeve mounted on the piston, wherein the first piston sleeve interfaces with the first seal during reciprocation of the piston;
a second piston sleeve mounted on the piston and spaced axially from the first piston sleeve along the piston; and
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 an open state with the intake seal assembly disengaged from an intake seat and a closed state with the intake seal assembly engaged with the intake seat;
wherein the piston includes a proximal rod, an intermediate rod connected to the proximal rod, a distal rod connected to the intermediate rod at an opposite end of the intermediate rod from the proximal rod, the first piston sleeve is mounted on the proximal rod, and the second piston sleeve is mounted on the distal rod; and
wherein the intermediate rod interfaces with the first piston sleeve and does not interface with the second piston sleeve.