High viscosity material pump having valved priming piston
AssigneeGraco Inc.
InventorsJames J. Handzel, Bradley K. Voigt
Life of this patent
Estimating the term…
Abstract
A reciprocable liquid pump having a priming cylinder affixed beneath the lower valve housing, and a priming piston rod affixed to the lower end of the pump piston valve assembly. A priming piston and priming valve are affixed to the lower end of the priming piston rod, the priming piston being slidable over a limited range of movement along the priming piston rod and having a central opening with a beveled valve seat. The priming valve forms a conical valve surface which is engageable against the priming piston valve seat to provide a controllable flow path through the center opening of the priming piston.
Claims13
In a reciprocable liquid pump having a piston rod and piston adapted for connection to a driving source, and a piston valve assembly in the piston and reciprocably movable along an axis within a main pumping cylinder, and an intake valve housing having an intake valve and intake valve seat, connected to the main pumping cylinder, the improvement comprising:
- a) a priming cylinder connected to said intake valve housing in alignment with said axis;
- b) a priming piston rod having a first end connected to said piston valve assembly in alignment with said axis, and having a second end;
- c) a priming valve element affixed to said second end;
- and
- d) a priming piston slidably movable along said priming piston rod and having a central opening and valve seat engageable against said priming valve element.
A reciprocable liquid pump having a piston rod adapted for connection to a driving source, comprising:
- a) a pump piston valve connected to said piston rod and a main pumping cylinder aligned along a common axis with said piston rod, the pump piston valve being reciprocably movable within said main pumping cylinder;
- b) a priming cylinder connected to said main pumping cylinder and aligned along said axis;
- c) a priming piston rod connected to said piston valve and aligned along said axis, said priming piston rod having a lower end positioned along said axis;
- d) a priming valve member affixed to the lower end of said priming piston rod;
- and
- e) a priming piston slidably movable about said priming piston rod, said priming piston having a central opening and seat engageable by said priming valve member.
Dependencies are inferred from the claim text.