Patents Assigned to Hanford N. Lockwood
  • Patent number: 5007614
    Abstract: A shut-off valve for use with high pressure gas cylinders is disclosed which is adapted to automatically retain a residual pressure in the cylinder. The valve includes a check plug axially moveable within the housing which has a hard sealing surface, for establishing high pressure seals and a soft sealing surface for establishing low pressure seals. The plug is spring-biased into the closed position with force selected so that it automatically closes and seals the interior of the cylinder once the gas pressure in the cylinder drops to or below a predetermined threshold pressure.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: April 16, 1991
    Assignee: Hanford N. Lockwood
    Inventor: Hanford N. Lockwood, Jr.