Sealing arrangement for a piston pump

摘要

A sealing arrangement for a reciprocating piston pump utilizing at least two sets of seals separately supported at spaced apart locations along the length of the pump cylinder. One of the sets of seals located rearwardly from the other with respect to the discharge end of the pump cylinder is enclosed within a chamber formed by a sleeve positioned around the pump plunger. This rearward set of seals is hydraulically pressurized radially inwardly by the aforesaid sleeve during the discharge stroke of the plunger, thereby creating a sealing clearance which is kept constant and providing an accurate and effective seal.