Electrohydraulic control device for double-acting consumer

Details Electrohydraulic control device for double-acting consumer Electrohydraulic control device for double-acting consumer

1997-02-06

1998-09-01

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

91448, 91455, F16D 3102, F15B 1304

Patent

active

057994854

ABSTRACT:
An electrohydraulic control device (10) for a double-acting consumer (11) is proposed, in which a continuous volumetric flow control to and from the consumer (11) is possible with two proportional 4/2-way magnet valves (12, 13), each with one seat valve function (26), and by means of two blocking valves (29, 38) of the seat valve type; free floating is attainable as the fourth work position. The magnet valves (12, 13) are structurally identical and are each connected into the volumetric flow to the consumer and the volumetric flow leaving the consumer; each consumer connection (28, 36) is sealed off tightly by a seat valve function (26) of the magnet valves (12, 13) and a blocking valve (29, 38). The magnet valves (12, 13) have a main control member (57) and a pilot control member (58), which cooperate in the manner of a followup controller and make do without a separate control oil supply, so that high hydraulic capacities can be controlled continuously and with short response times.

REFERENCES:
patent: 2650609 (1953-09-01), Herbst
patent: 2671433 (1954-03-01), Meddock
patent: 2804883 (1957-09-01), Curlett
patent: 3906980 (1975-09-01), Hanser et al.
patent: 4096784 (1978-06-01), Ongaro
patent: 5211196 (1993-05-01), Schwelm

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