Patents Assigned to Koppel Aktiengesellschraft
  • Multiport valve
    Patent number: 5038825
    Abstract: In a hydraulically operated multiport valve having a floating position for connecting the cylinder chambers of a hydraulic piston-cylinder drive, a valve slide and a restraining piston associated with it are provided. By means of a respective dimensioning of the surface of both the part of the valve slide which can be charged with control pressure for attaining the floating position and of the restraining piston, a displacement of the restraining piston against the maximum pressure present in its control chamber becomes possible.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: August 13, 1991
    Assignees: O & K Orenstein, Koppel Aktiengesellschraft
    Inventors: Gunter Hilmer, Walter Kolb