F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/75
F15B 15/14 (2006.01) F15B 11/08 (2006.01)
Patent
CA 1177726
Abstract The outlets of two independent fixed volume pumps are connected to the two ends of a double-acting, large rod hydraulic cylinder. The outlets of the two pumps are also connected, through a three-position direction control valve, to tank. In the neutral position, both outlets are dumped to tank. In an extension control position, the valve restricts the dump line for one pump, thereby directing its outlet to the cap end of the cylinder; and in the retract control posi- tion the valve restricts the dump line for the other pump, thereby effecting flow to the rod end of the cylinder. The fluid line between each pump outlet and its respective cylin- der end includes a check valve. A cross-piloted sequence valve is connected in each fluid line between the respective cylinder end and check valve, and responsive to the pressure of the opposite fluid line. A control method includes the steps of supplying fluid to the two cylinder ends by respec- tive independent pumps, flowing fluid from the pump outlets to tank and selectively restricting flow to tank from one pump to effect flow from that pulp to the cylinder,and controlling fluid flow from the cylinder by cross-piloted sequence valves.
410435
Otis Engineering Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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