Pump having air valve with integral pilot

Details Pump having air valve with integral pilot Pump having air valve with integral pilot

2006-04-11

2006-04-11

Freay, Charles G. (Department: 3746)

Pumps

Motor driven

Fluid motor

C091S329000

Reexamination Certificate

active

07025578

ABSTRACT:
A pump comprising a valve housing and a spool slidably positioned within the valve housing. The spool has a supply face, a first end face, and a second end face, and is slidable between a first position wherein pressurized supply air is supplied to the supply face and the first end face, the first end face having a greater surface area than the supply face, a second position wherein the supply air is supplied to the supply face and is blocked from both the first and second end faces, and a third position wherein the supply air is supplied to the supply face and the second end face.

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patent: 5391060 (1995-02-01), Kozumplik, Jr. et al.
patent: 5567118 (1996-10-01), Grgurich et al.
patent: 6382934 (2002-05-01), Budde

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