| 摘要 |
<p>The invention relates to a control device for a hydraulically operated consumer which is suppliable with pressure fluid from a source of pressure medium through a supply conduit, a control unit and a service main on the inlet side and is connectible to a tank through a service main on the outlet side, the control unit and a return conduit, wherein the housing of the control unit contains control apertures associated with the supply conduit, the service mains and the return conduit, which apertures are connectible in pairs in the operative position by means of a control slide which blocks the supply in the neutral position. The supply conduit is associated with a pressure differential regulator which is influenced in one direction by the pressure in the supply conduit and in the opposite direction by a spring and by the pressure in a sensing conduit connected to the service main on the inlet side. The control slide and housing form two switching valves of which one connects the sensing conduit to the return conduit in the neutral position and the other connects the sensing conduit to the service main on the inlet side in the operative position and blocks this position is the respective other position. The housing of the control unit is provided with two interconnected control apertures associated with the sensing conduit, of which one is disposed on the one side of a return conduit control aperture and the other is disposed on the opposite side of a return conduit control aperture. The control slide comprises two first sensing conduit valve apertures which, in the neutral position, connect the two sensing conduit control apertures to the associated return conduit valve apertures which, in the neutral position, connect the two sensing conduit control apertures to the associated return conduit control aperture. Thus the valve connecting the sensing conduit to the return conduit in the neutral position is provided directly on the control slide in the form of a double valve, and no time delays therefore occur.</p> |
