Patents Assigned to Giant Industries
  • Low-leakage valve apparatus
    Patent number: 7048254
    Abstract: A low-leakage valve apparatus which reduces fugitive emissions from valves to the ambient atmosphere. A secondary packing chamber or gland is installed on an existing valve to intercept leakage past the valve's original primary packing gland, which otherwise would escape past the valve stem to the atmosphere.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: May 23, 2006
    Assignee: Giant Industries
    Inventors: John Arthur Laurent, James Patrick Hallock