Patents Examined by David Reifsnhder
  • Buoyed flapper valve
    Patent number: 5141644
    Abstract: A buoyed flapper valve comprises a flapper which is capable of closing an exit of a dipleg or standpipe, which is also connected to a counterweight and a float. The float has sufficient buoyancy to as to overcome the weight of the counterweight when the valve is submerged in a bed of particulate material. The flapper valve is preferably employed as a dipleg check valve within a reactor, e.g., a riser reactor system, and can be used under a variety of operating conditions including both submerged and non-submerged operating conditions.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: August 25, 1992
    Assignee: Chevron Research & Technology Company
    Inventor: Ralph M. Forde