Manually operated fluid dispensing pump

摘要

A manually operated reciprocating fluid pump comprising a pump housing, a plunger, a piston and a priming valve. The pump housing has an inner surface and a pump chamber defined at least in part by the inner surface. The pump chamber extends axially through the pump housing. The plunger is extends axially downwardly into the pump chamber. The piston is on the plunger and is reciprocally and axially slidable within the pump chamber between a bottom stroke position and a top stroke position. The priming valve is mounted on the plunger radially inwardly of the piston for movement with the plunger. It is configured to be open and thereby permit fluid to flow upward through the pump chamber when the piston stroke moves the piston downward from the top stroke position toward the bottom stroke position and configured to be closed and thereby prevent fluid from flowing upward through the pump chamber when the piston stroke moves the piston upward. A sealing plug is moveable with the plunger and is configured to seat against and seal closed the pump chamber when the piston is in its bottom stroke position to prevent fluid from flowing upward through the pump chamber. It is configured to be unseated from the pump chamber when the piston is positioned above its bottom stroke position. The priming valve and sealing plug are mounted on the plunger in a manner to prevent axial movement of the priming valve and sealing plug relative to the plunger.