Patents Assigned to Dubro, Inc.
  • Patent number: 4281684
    Abstract: A balanced rotary-faced valve for the control of the flow of pressurized hydraulic fluid to hydraulic apparatus having extend and retract ports is described. The valve has a sculptured body portion defining a flat land portion that contains a series of recesses, each one of the recesses in fluid communication with corresponding pressure, drain extend and retract ports. A rotary disk in sliding contact with the flat land portion has recesses capable of registration with corresponding recesses in the flat land portion. The disk is rotatable thereby controlling the flow of pressurized fluid within the valve. The rotary disk has passageways that guide the pressurized fluid to both sides of the disk so as to cause a slight force imbalance in a direction to urge the rotary disk towards the flat land portion. The rotary disk is controlled by a return to neutral spring-loaded control shaft.
    Type: Grant
    Filed: September 24, 1979
    Date of Patent: August 4, 1981
    Assignee: Dubro, Inc.
    Inventor: Helmut Broeg