| 摘要 |
<p>The hydraulic control-unit consists of a housing, a control slide-valve displaceable in the bore of the housing, and a control-ring. Axial displacement of the said control slidevalve makes it possible to connect together, or to disconnect, various connecting lines, depending upon the position of the valve. Located in an annular chamber, formed between a section of the housing-bore and the control-valve slide, is a controlring arranged coaxially with the said valve and guided displaceably thereupon. Valve-seats are spaced axially from each other, both in the housing-bore and on the control slide-valve. The said control-ring comprises inner mating surfaces and outer mating surfaces co-operating with the said valve-seats. Provided between the two valve-seats, in the control. slidevalve, in a duct running therein, the said duct being closed at one end or the other, depending upon the position of the said control-ring. The latter is held, by the pressure of the flowing medium, in the appropriate closed position, but the change-over may be effected independently of the pressure, since no axial forces are applied to the said control slide valve by the following medium.</p> |
