Open hydraulic circuit including a relief valve device

Details Open hydraulic circuit including a relief valve device Open hydraulic circuit including a relief valve device

2006-12-19

2006-12-19

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C060S493000

Reexamination Certificate

active

07150150

ABSTRACT:
The circuit includes a main pump, a hydraulic motor, two main ducts, a selector for connecting the main ducts to the main pump or to a reservoir or for isolating them therefrom, a boost duct, and two pressure limiters disposed between the main ducts. A relief valve device that can take up a retention position and a relief position in which it connects one main duct (14, 16) to a relief enclosure can take up its relief position when, with the selector isolating the main ducts from the main pump and from the reservoir, the difference between the pressure in the main duct to which the control duct is connected and a relief pressure higher than the boost pressure changes sign.

REFERENCES:
patent: 5197283 (1993-03-01), Kagiwada et al.
patent: 5419132 (1995-05-01), Sato et al.
patent: 5897176 (1999-04-01), Dvorak et al.
patent: 0 089 412 (1983-09-01), None
patent: 2 781 532 (2000-01-01), None
patent: 2 112 910 (1983-07-01), None

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