Anti-saturation valve assembly for load sensing hydraulic...

Details Anti-saturation valve assembly for load sensing hydraulic... Anti-saturation valve assembly for load sensing hydraulic...

2011-01-11

2011-01-11

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

C091S444000

Reexamination Certificate

active

07866151

ABSTRACT:
An anti-saturation valve assembly (51) for use in a hydraulic system having priority (17) and auxiliary (25) load circuits, the priority circuit providing a priority load signal (19). The anti-saturation valve assembly includes a pressure sensor portion (61) which senses a decrease between pump pressure (23) and the priority load signal (19), and generates a force on a pressure reducing portion (63) to reduce, correspondingly, a pilot pressure (59): The reduced pilot pressure to a pilot valve (35) results in reduced flow to a pilot-operated main control valve (27) in the auxiliary load circuit (25), thus providing anti-saturation protection for the circuit, without throttling a main flow path and wasting substantial hydraulic power.

REFERENCES:
patent: 3455210 (1969-07-01), Allen
patent: 4043419 (1977-08-01), Larson et al.
patent: 5207059 (1993-05-01), Schexnayder
patent: 6076350 (2000-06-01), Deininger
patent: 199 57 27 (2001-05-01), None

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