Dispensing pump having piston assembly arrangement

摘要

A pump includes a pump body defining a fluid chamber and inlet and outlet ports in fluid communication with the fluid chamber, an inlet check valve connected to the inlet port, an outlet check valve connected to the outlet port, and a piston housing coupled to the pump body and defining a piston chamber. A piston assembly is disposed at least partially within the piston chamber and at least partially within the fluid chamber and includes a piston and a poppet connected to the piston in proximity to the pump body. In addition, the pump includes a gland disposed between a portion of the piston housing and the pump body. Further, the pump includes the poppet having a poppet head axially connected to a diaphragm coupled to a poppet flange. The poppet head is connected to the piston.

主权项

1. A pump comprising:
a pump body defining a fluid chamber and an inlet port and an outlet port in fluid communication with the fluid chamber; an inlet check valve directly connected to the inlet port and to permit fluid flow into the inlet port; an outlet check valve directly connected to the outlet port and to permit fluid flow out of the outlet port; a piston housing coupled to the pump body, the piston housing defining a piston chamber; a piston assembly disposed at least partially within the piston chamber and at least partially within the fluid chamber, the piston assembly including a piston and a poppet connected to the piston in proximity to the pump body, the piston including a flange at an end of the piston opposite the poppet; a gland disposed between a portion of the piston housing and the pump body, an actuating volume of the piston chamber defined between the flange of the piston and the gland; and the poppet having a poppet head axially connected to a diaphragm coupled to a poppet flange, the poppet head connected to the piston, a portion of the piston defining an outer diameter disposed directly adjacent a portion of the diaphragm extending axially toward the gland, the poppet flange disposed axially between the gland and the pump body, the diaphragm to rollingly engage an opposing surface in response to movement of the piston.