F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
138/41.11
F16H 39/02 (2006.01)
Patent
CA 1156907
ABSTRACT A valve for controlling fluid flow in a hydraulic system, parti- cularly a hydraulic fan drive system. The valve comprises a housing having an axially extending bore, an inlet port, an outlet port, a pilot port and a bypass port. A valve element is movable in the bore for controlling fluid flow between the inlet port, the outlet port and the bypass port. A pilot fluid pressure actuated device is connected with the valve element for moving the valve element in one axial direction, and a spring for moving the valve element in the opposite axial direction. The pilot pressure actuated device is in fluid communication with the pilot port. The valve element is axially movable in opposite directions between a first position establishing predetermined flow paths between the inlet port, the outlet port and the bypass port, and a second position establishing at least a predetermined flow path between the inlet port and the outlet port. Fluid reaction surface means are connected with the valve element and is disposed in fluid communication with fluid flowing through the valve element. The fluid reaction surface means is designed so that fluid pressure acting thereagainst produces a resultant force on the valve element urging the valve element toward the first position.
414056
Fetherstonhaugh & Co.
Trw Inc.
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