Patents Assigned to Aldridge Piling Equipment (Hire) Co. Ltd.
  • Control valve arrangements
    Patent number: 7832427
    Abstract: A valve arrangement includes a valve member, which rotates continuously in one sense. The generally cylindrical head of the valve member, within the housing, is formed to co-operate with various ports to create reciprocation in the actuator. It is preferred to provide some vibration of the valve member, to assist in overcoming the effects of friction.
    Type: Grant
    Filed: January 19, 2004
    Date of Patent: November 16, 2010
    Assignee: Aldridge Piling Equipment (Hire) Co. Ltd.
    Inventor: David Coley