Plunger pump

Abstract From the Canadian patent

A plunger pump comprises a cylinder; a plunger reciprocating within said cylinder; a sucking chamber formed upon a top of said plunger; a sucking pipe and a discharge pipe communicated with said sucking chamber; and slidable means formed upon an inner wall of said cylinder in the proximity of an open end thereof. The sucking chamber and the slidable means are intercepted from each other by an intercepting fluid stream formed therebetween, thereby any contaminants occurring from the slidable means are prevented from being penetrated into the sucking chamber and discharged, outside the plunger pump together with the intercepting fluid stream.