F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/69.12
F15B 11/17 (2006.01)
Patent
CA 1107174
HYDRAULIC SYSTEM WITH UNLOADING VALVE ASSEMBLY Abstract of the Disclosure A hydraulic system having a reservoir fed charge pump supply- ing pressurized fluid through a charge passage and a filter to the inlet of a supply pump for direction controlled fluid devices includes a reservoir connected unloading valve assembly connected to the charge passage and parallel with the filter. The fluid devices return fluid through a return passage connected to the unloading valve assembly which maintains back pressure on the devices at charge passage pressure. The unloading valve assembly includes an unloading valve movable in response to a predeter- mined fluid pressure at the inlet of the supply pump to unload the charge and return passage by connecting them to the reservoir. As the devices require more fluid from the supply pump causing the pressure at the inlet of the supply pump to drop, the unload- ing valve proportionately blocks the charge and return passages from the reservoir to circulate return fluid into the charge passage. The unloading valve assembly further includes a signal valve which responds to a predetermined pressure differential across the filter to provide a signal indicative of a clogged filter and to cause the unloading valve to connect both the charge and return passages to the reservoir in such a situation.
336466
Kittle Carl E.
Wittren Richard A.
Borden Ladner Gervais Llp
Deere & Company
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