F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/79
F15B 11/22 (2006.01) B66F 3/46 (2006.01) E02F 3/43 (2006.01) F15B 13/07 (2006.01)
Patent
CA 1261232
ABSTRACT OF THE DISCLOSURE A self-leveling series type hydraulic system including boom and bucket valves which separately control boom and bucket cylinders and a flow divider valve positioned in the exhaust flow path of the rod end of the boom cylinder. The flow divider valve splits the flow sending a portion of it to the cap end of the bucket cylinder so as to maintain the bucket in a level condi- tion during raising of the boom with the remaining flow connected to one of the boom valve motor ports. An improved boom lower circuit which bypasses the flow divider valve as the boom is lowered to achieve a faster boom lower rate and the inclusion of an unloading valve in the bucket circuit which includes the dual function of preventing cavitation and relieving high pressure.
517603
Eaton Corporaion
Osler Hoskin & Harcourt Llp
LandOfFree
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