Patents Assigned to Gray Tool Comany
  • Fire resistant valve
    Patent number: 4556076
    Abstract: A normally non-rising stem valve having a valve stem (30) journaled between bearings (38, 40) is equipped with an energized drive spring (56) for positively engaging backseat seal surfaces (64, 66) upon melting of a fusible ring (52). The spring (56) is compressed axially against the retainer (46) by the cooperative action of the compression nut (58) and the tubular spacer (50), thereby normally avoiding undesirable axial thrust on the bearings (38, 40).
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: December 3, 1985
    Assignee: Gray Tool Comany
    Inventor: Charles D. Bridges