Pump for concentrate packages

摘要

A pump for delivering product from a product package to a nozzle. The pump may include a housing with a first port, a second port, and an interior. The first port mates with the product package and the second port mates with the nozzle. A first check valve may be positioned within the first port. A piston rod may be positioned within the interior of the housing for movement therein. The piston rod may include a first piston and a second piston. The first piston may include a second check valve positioned therein such that the product is forced past the first check valve on a down stroke of the piston rod and forced past the second check valve on an up stroke of the piston rod.