Patents Assigned to Ledeem Flow Control Systems, Inc.
  • System for precise valve control
    Patent number: 4542814
    Abstract: A system for precise positioning of a fluid control valve including a reciprocating piston at each end of a worm shaft, each to rotate the worm shaft in one direction only, through a scotch yoke and a rotary drive transmission. Selection of a valve determines which rotary drive is operated and a hydraulic piston clutch is engaged each time a particular drive is activated and remains engaged to hold a selected position.
    Type: Grant
    Filed: September 30, 1983
    Date of Patent: September 24, 1985
    Assignee: Ledeem Flow Control Systems, Inc.
    Inventors: Howard L. Ledeen, Chander P. Mittal