Electrohydraulic control device for double-acting consumer
USRE38355E1 · kind E1 · reissue
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2000 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Feb 7, 2020 |
Classification
- Technology area (CPC —)General
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.