Patents Assigned to Kemp Development Corp.
  • Ball valve having retractable sealing member
    Patent number: 6425570
    Abstract: A ball valve having an upstream seat (92) with the seat actuated by outside pressure (14, 16). Retraction members (100, 102) continuously urge seat (92) to a retracted position out of sealing engagement with the ball. A sealing member (104) fits loosely within an annular recess in the seat (92).
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: July 30, 2002
    Assignee: Kemp Development Corp.
    Inventor: Willard E. Kemp