Blocking valve control system for lift driven by variable displa

Details Blocking valve control system for lift driven by variable displa Blocking valve control system for lift driven by variable displa

1990-04-02

1991-08-20

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

91445, 91447, 91461, F15B 1108

Patent

active

050403672

ABSTRACT:
A hydraulic lift is raised by hydraulic fluid which passes through a servo valve and is lowered when the servo valve exhausts the hydraulic lift to a reservoir. The hydraulic fluid travels to and from the lift through a service line in which a blocking valve is disposed. A control unit opens the blocking valve against a spring bias in response to the application of a control pressure to a control element disposed on one side of the control unit. The control pressure is supplied via a control line which also actuates the servo valve. A branch control line branches from the control line and applies pressure to another control element which acts counter to the first-mentioned control element. The branch control line includes tow throttles between which a discharge line is connected and communicates with the reservoir.

REFERENCES:
patent: 4542678 (1985-09-01), Kochendorfer et al.
patent: 4667570 (1987-05-01), Jensen et al.
patent: 4960035 (1990-10-01), Kauss

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