Fluid handling – Systems – With flow control means for branched passages
Patent
1986-04-17
1987-10-20
Michalsky, Gerald A.
Fluid handling
Systems
With flow control means for branched passages
91446, 91459, 137115, 137488, 137522, 137554, 1376253, 251 634, 25112911, 187111, F15B 13044
Patent
active
047007486
ABSTRACT:
The point at which pump out pressure exceeds load is sensed to provide a point for scheduling flow to an actuator in a hydraulic system. Flow is controlled by a stepper motor (28) that moves a flow control valve (27). The steps needed to achieve fixed flow changes are greater for high flow positions. When the pump (21) is turned on, the valve (27) is positioned to bypass flow; the bypass flow is then programmably decreased to the actuator. Reverse flow is regulated by the valve (27) to control actuator retraction. Reverse flow is initiated by opening a check valve (40) with an actuator (50) that opens it first to reduce pressure across the valve, then fully. The flow control valve (27) also operates to relieve excess pressure in the system.
REFERENCES:
patent: 3391702 (1968-07-01), Kast
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4205592 (1980-06-01), Haussler
patent: 4239179 (1980-12-01), Geier
patent: 4318332 (1982-03-01), Shingu et al.
patent: 4340086 (1982-07-01), Hemm et al.
patent: 4418794 (1983-12-01), Manco
Fossati Giorgio
Manco Giuseppe
Terry Harold
Michalsky Gerald A.
Otis Elevator Company
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