Fluid handling – Systems – Supply and exhaust
Patent
1979-11-29
1981-08-11
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
91446, 91451, 13759615, F15B 13042
Patent
active
042828988
ABSTRACT:
PCT No. PCT/US79/01033 Sec. 371 Date Nov. 29, 1979 Sec. 102(e) Date Nov. 29, 1979 PCT Filed Nov. 29, 1979
Heretofore the capability of operating a system (10), which supplies fluid to a hydraulic circuit (12), selectively at either a high or a low flow rate with only a single pressurized fluid source (14) has not existed. Such a system (10) includes a control valve structure (16) for controlling delivery of fluid from the source (14) to drive the circuit (12) and a flow control (22) for metering a portion of the fluid to the circuit (12). The capability of operating such a system (10) selectively at either a high or a low flow rate is advantageous in some modes of operation of the circuit (12). Herein, hydraulic circuitry (86) serves for controlling the magnitude of the portion in response to application of a signal thereto and a device (78) is provided for selectively applying the signal to the circuitry (86) for selectively directly controlling the magnitude of the portion.
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patent: 3587630 (1971-06-01), Dike et al.
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patent: 3831620 (1974-08-01), Bianchetta et al.
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patent: 3901264 (1975-08-01), Stephens
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patent: 4209039 (1980-06-01), Budzich
Harmon James L.
Junck John A.
Caterpillar Tractor Co.
Michalsky Gerald A.
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