Electrohydraulic directional control valve system

Details Electrohydraulic directional control valve system Electrohydraulic directional control valve system

1979-09-07

1981-05-12

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762564, F15B 13043

Patent

active

042665728

ABSTRACT:
The electrohydraulic directional control valve system includes a preliminary directional control valve and a main control valve, the latter having a control spool which is normally brought into its neutral or blocking position by means of two springs arranged in pressure chambers at respective ends of the control spool. The preliminary control valve has a sliding spool which at one end is urged by a spring into an additional safety position in which the pressure chambers of the main control valve are interconnected and pressure relieved, and the intake of the pressure fluid is blocked. A single proportionally operating solenoid counteracts the spring at the other end of the control spool of the preliminary control valve.

REFERENCES:
patent: 2953123 (1960-09-01), Reen et al.
patent: 3450160 (1969-06-01), Tess
patent: 3995532 (1976-12-01), Junck et al.

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