Patent ID: 6220835
Filing Date: 2001-04-24
Classification: F04B

Abstract:
A condiment dispensing pump comprising:a pump chamber including a cavity having an inlet chamber cavity portion and an outlet chamber cavity portion, the pump chamber having an inlet fluidicly coupled with the inlet chamber cavity portion and an outlet fluidicly coupled with the outlet chamber cavity portion;an outlet check valve disposed at or near the outlet of the pump chamber, the outlet check valve being openable to permit flow only in a direction from the outlet chamber cavity portion out through the outlet check valve; anda piston disposed in the pump chamber cavity between the inlet chamber cavity portion and the outlet chamber cavity portion, the piston being movable in the pump chamber cavity to reapportion the volume of the pump chamber cavity between the inlet chamber cavity portion and the outlet chamber cavity portion, the piston including a piston check valve which is openable to permit flow only in a direction from the inlet chamber cavity portion through the piston check valve to the outlet chamber cavity portion.