Hydraulic system with warm up circuit

Details Hydraulic system with warm up circuit Hydraulic system with warm up circuit

2007-12-03

2010-11-09

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control means responsive to, or...

C091S431000

Reexamination Certificate

active

07827785

ABSTRACT:
A hydraulic control system in which a pump for pressurized hydraulic fluid connects with a valve assembly having a valve element displaceable in a chamber to selectively direct fluid to a load driven by the hydraulic system. Surfaces on the end faces of the valve element are exposed to hydraulic pressure from a controller via electro-hydraulic solenoid valves. The surfaces of the valve element adjacent the end faces are undercut to establish a leakage flow path and the solenoid valves are selectively actuated to pressurize the end faces to a level below normal actuation of the valve element but high enough to cause fluid to return to a drain and thus increase the temperature of the hydraulic fluid in the system.

REFERENCES:
patent: 4972762 (1990-11-01), Kubik
patent: 5251440 (1993-10-01), Bong-Dong et al.
patent: 6397590 (2002-06-01), Hart
patent: 59054805 (1984-03-01), None
patent: 2001182705 (2001-07-01), None

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