Patents Assigned to Willaims Fire & Hazard Control, Inc.
  • Fluid additive supply system for fire fighting mechanisms
    Patent number: 5979564
    Abstract: An additive supply mechanism and method for fire fighting mechanisms, such as fire fighting trucks, including an additive supply conduit, an additive pump means, a recirculation line having a balanced pressure valve throttling the line, at least one sensor measuring recirculation line flow and an additive pump output control apparatus responsive to measured recirculation line flow.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: November 9, 1999
    Assignee: Willaims Fire & Hazard Control, Inc.
    Inventor: Dennis W. Crabtree