Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Reexamination Certificate
2008-01-09
2010-10-26
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
Reexamination Certificate
active
07818966
ABSTRACT:
A hydraulic valve assembly includes a pressure compensating valve in which a compensator spool is slideably received in a bore. A pre-compensator gallery connected to a metering orifice, a preload gallery leading to a hydraulic actuator, an auxiliary pump supply passage, and a load sense passage all open into the bore. The compensator spool moves in response to a pressure differential between the pre-compensator gallery and the load sense passage. That movement selectively opens and closes a first path between the pre-compensator gallery and the a preload gallery, and a second path between the auxiliary supply passage and the load sense passage. Control of these paths maintains a constant pressure drop across the metering orifice and generates a pressure signal that is employed to regulate pressure at an outlet of a pump.
REFERENCES:
patent: 4693272 (1987-09-01), Wilke
patent: 5579642 (1996-12-01), Wilke et al.
patent: 5715865 (1998-02-01), Wilke
patent: 5806312 (1998-09-01), Kauss et al.
patent: 6098403 (2000-08-01), Wilke
patent: 6318079 (2001-11-01), Barber
Greenwood Jason
Pack Andreas S.
Pieper Gary
Haas George E.
HUSCO International Inc.
Leslie Michael
Quarles & Brady LLP
LandOfFree
Hydraulic control valve system with isolated pressure... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control valve system with isolated pressure..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control valve system with isolated pressure... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4165278