Patent ID: 6302659
Filing Date: 2001-10-16
Classification: F02M,F04B

Abstract:
A multi-chamber positive displacement pump comprising:a unitary housing in which is formed a plurality of cylinders;a pumping plunger slidably mounted in each cylinder to define a pumping chamber;means for reciprocating the pumping plungers in order cyclically to vary the volume of the pumping chambers to effect delivery of a pumped fluid from the pumping chambers;a delivery passage connected to each of the pumping chambers to receive pumped fluid therefrom, the delivery passage comprising at least one gallery formed in the unitary housing and open to an end face of the housing and passageways which extend through the unitary housing from the gallery to the pumping chambers, the gallery being closed by an end plate which is secured to the unitary housing; anda plurality of feed passages to feed fluid to the pumping chambers, wherein the feed passages are also formed by galleries in an end face of the unitary housing and passageways formed in the unitary housing, whereinthe end face in which the feed galleries are formed is the same end face as that in which the delivery galleries are formed and the end plate closes both the delivery galleries and the feed galleries.