F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/44
F15B 11/16 (2006.01)
Patent
CA 1156124
VALVE SYSTEM Abstract A fluid power control system having an improved control valve providing reduced regulated pressure fluid selectively from a high pressure pump supply (P) or the fluid motor under conditions wherein the pump supply has failed to supply the desired pressurized fluid. The system utilizes a control valve having a spool provided with first transfer passage and second transfer passage. The first transfer passage is adjustably throttled as a result of movement of the spool relative to an adjacent inlet port and the second transfer passage is adjustably throttled by movement of the spool relative to an adjacent inlet port. Inlet port is connected to the high pressure fluid supply P and inlet port is connected to the head end of the cylinder of the fluid motor through a check valve. Valve provides selective pressure regulated fluid through an outlet port thereof either from the pressurized fluid supply P when that apparatus is functioning or from the fluid motor in the event of a failure of the fluid supply. In each case, the valve provides the fluid at a desired operating pressure. The pressure regulated fluid may be used to operate a pilot valve controlling a main valve for adjustably positioning the piston of the fluid motor.
369602
Earley Robert W.
Melocik Kurt B.
Caterpillar Tractor Co.
Smart & Biggar
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