Fluid handling – Systems – Supply and exhaust
Patent
1976-03-23
1977-10-04
Cline, William R.
Fluid handling
Systems
Supply and exhaust
137117, 91412, 91446, F16K 1100
Patent
active
040518680
ABSTRACT:
The invention relates to a hydraulic control valve assembly, or a plurality of control valve assemblies, for controlling one or more consumer units such as hydraulic motors. Each valve assembly has conventional supply and exhaust ports for selectively and alternately pressuring and exhausting two ports to which a consumer unit is connected. Each valve assembly has pressure sensing control ports which sense pressure in the consumer unit ports. Conduit means connected to the control ports include a pressure differential regulator which shunts the supply pressure and which reacts to pressure supplied to the consumer unit to control the regulator. In a preferred embodiment comprising a plurality of control valve assemblies and associated consumers and a common pressure differential regulator, the individual sensing conduits of all control units are connectable at one end to the return conduit in the neutral position and are combined at the other end to form a collecting sensing conduit. The collecting sensing conduit is connected to the return conduit by a relief line which is open at least in the neutral position of the control slide. Each individual sensing unit contains a check valve which closes when the pressure in the collecting sensing conduit exceeds the pressure in the individual sensing conduit. The pressure in the supply conduit is thereby set so that the consumer unit with the highest load will still receive an adequate pressure.
REFERENCES:
patent: 3693506 (1972-09-01), McMillen et al.
patent: 3742980 (1973-07-01), Byers, Jr.
patent: 3744517 (1973-07-01), Budzich
patent: 3750690 (1973-08-01), Bubula et al.
patent: 3807447 (1974-04-01), Masuda
patent: 3882896 (1975-05-01), Budzich
patent: 3976097 (1976-08-01), Brakel
patent: 3984979 (1976-10-01), Budzich
patent: 3989062 (1976-11-01), Tennis
patent: 3998134 (1976-12-01), Budzich
Cline William R.
Danfoss A/S
Spiegel H. Jay
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