Importance

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Abstract

A pump that is in essence leak-proof and prevents the escape to ambient atmosphere of environmentally hazardous fluent materials is comprised of an outlet block defining a pump chamber having a fluid inlet and a fluid outlet, a piston having one end reciprocable within the pump chamber and sealed to the outlet block, a piston rod connected to the other end of the piston for reciprocating the piston, a dynamic block secured to the outlet block and defining a sealed dynamic chamber within which the other end of the piston reciprocates, and an outlet from the dynamic chamber in continuous closed-circuit communication with a recirculating system for preventing escape into the environment of any fluent material that may leak past the piston seal. The pump also includes an articulated seal for sealing the piston rod to the dynamic chamber to maintain the sealed integrity of the chamber while at the same time accommodating reciprocation of the piston rod. In a preferred embodiment, two pumps are operated alternately by a reciprocating fluid motor, a common manifold provides for delivery of fluent material to the inlets of both pumps, and the dynamic chamber outlets are in closed-circuit communication with one another so that fluent material can course back and forth between the two chambers without impeding operation of the pumps.

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First Claim