Patent ID: 8734139

Claim:
A pump, comprising: a pump housing comprising pressure-boundary walls defining a pump cavity, the pump housing having first and second housing portions conjoined with each other by a dynamic seal allowing movement of at least one housing portion relative to the other housing portion in response to a pressure condition in the pump cavity by automatically changing a volume of the pump cavity at least while the pump cavity is primed with fluid, the housing further defining at least one inlet and at least one outlet; a bias, situated relative to the first and second portions of the pump housing and providing a selected counter-force to the movement of the housing portion(s); a movable pumping member situated in the pump cavity and, when driven to move, urging flow of the fluid from the inlet through the pump cavity to the outlet; and a mover coupled to the pumping member so as to drive pumping motions of the pumping member, wherein the first portion of the housing comprises a respective cylindrical portion, and the second portion of the housing comprises a respective cylindrical portion that is slip-fit into the cylindrical portion of the first portion; and the dynamic seal comprises at least one ring seal situated between the respective cylindrical portions.