Patents Assigned to Hermann Waldner KG
  • Shut-off valve
    Patent number: 4212448
    Abstract: A shut-off valve adapted to be used to advantage in pipework installations carrying liquid, semi-liquid or pasty material has a housing having a bore therein and ports in the wall for the connection of conduits. A member for selectively closing the ports is rotatably disposed in the bore of the housing. The housing has annular wedge shaped surfaces on opposite sides of the bore and the closure member has tapered conical surfaces which are disposed against the wedge shaped surfaces of the housing.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: July 15, 1980
    Assignee: Hermann Waldner KG
    Inventor: Gunther Wulf