Hydraulic system with an unloading valve

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United States of America Patent

PATENT NO 9869359
SERIAL NO

14473124

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Abstract

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A relief valve in a hydraulic system in a machine selectively sends pressurized oil to both a brake cooling apparatus and a cylinder used to hoist a load. A relief valve lowers pressure spikes in a brake cooling line by dumping fluid in a brake cooling line to tank responsive to a pressure spikes at the head end of the cylinder during hoisting or other transitions in the hydraulic system. Reducing the pressure spikes in the brake cooling line improves reliability of the brake cooling apparatus by protecting seals from undue stresses.

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Patent Owner(s)

Patent OwnerAddress
CATERPILLAR INC100 NE ADAMS STREET PEORIA IL 61629-9510

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Holmes, Derek W Tuscola, US 2 1
Hudson, Michael D Mount Zion, US 28 2271
Kleitsch, Andrew J Shorewood, US 5 18
Mather, Daniel Lockport, US 1 0
McIlheran, Carl Channahon, US 3 9
Vacca, John C Joilet, US 1 0

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