Dual acting piston pump having reduced back flow between strokes

Details Dual acting piston pump having reduced back flow between strokes Dual acting piston pump having reduced back flow between strokes

1998-12-16

2000-12-05

Leung, Philip H.

Pumps

Expansible chamber type

Plural pumping chambers

417403, F04B 5300

Patent

active

061558060

ABSTRACT:
A dual acting pump for dispensing pressurized liquids including a pump housing, a reciprocating pump shaft contained in a pumping chamber and at least one spring-biased check valve member. In the preferred embodiment, a spring-biased check valve member is connected to one end of the pump shaft for closing a flow passage in the pump shaft during movement in one direction and for opening the flow passage during movement in the opposite direction. Similar spring-biased check valves are connected to the pump inlet and pump outlet. The check valves comprise hollow balls and, in combination with the springs, this assures that liquid output from the pump is not reduced significantly when the pump shaft changes direction.

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Nordson Corporation, SP Series Pumps, two pages, 1993, 1998.
Nordson Corporation, Series 3000, Hot Melt Adhesive Pumps, two pages, 1989.

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