Internal bellows pump fluid path

摘要

In a reciprocating piston pump, piston 34 has first or upper end 48 and second or bottom end 50 having inlet 52 and outlet 54 bores respectively located therein. Inlet check 32 is located in bore 52 while outlet check 42 is located in bore 54. As can be seen in FIG. 3, each of bores 52 and 54 branches into three (in the preferred embodiment) flow paths which alternate and are intertwined. It is the unique flow paths incorporating both the inlet and outlet check valves in the piston that are the key features of the invention.

主权项

1. A reciprocating piston pump comprising:
a piston rod connected to the piston; a pump housing that includes a cylinder; a piston movable within the cylinder, the piston having a first end and a second end; an inlet check valve located in the first end of the piston; an outlet check valve located in the second end of the piston; a plurality of inlet passages extending through the piston from the inlet check valve to the second end of the piston; and a plurality of outlet passages extending through the piston from the outlet check valve to the first end of the piston, wherein the plurality of outlet passages are spaced from one another and are spaced from the plurality of inlet passages; wherein the inlet check valve and the outlet check valve are in axial alignment with the piston rod.