Resources Contact Us Home
Bi-directional fluid loss device and method

Image Number 3 for United States Patent #7252153.

A fluid loss device including a flapper and seat assembly that provide a seal on a lower flapper surface when the flapper is closed and resists pressure in either direction. The flapper and seat assembly is spring biased to contact a flapper support above the flapper to resist deformation of the flapper due to a pressure differential from below the flapper. The flapper and seat assembly may be moved by tubing pressure to release an opening prop that opens the flapper. The valve seat may include an elastomeric seal element to improve the fluid flow restriction. The flapper and seat assembly is also biased upward by a pressure differential from below to above the flapper, to thereby increase the flapper to valve seat pressure as the fluid pressure differential increases.

  Recently Added Patents
Selection of system parameters based on non-acoustic sensor information
Lens system
Method and apparatus for networked modems
Terminal for flat test probe
Precision geolocation of moving or fixed transmitters using multiple observers
Image processing system, image processing method and program for image processing
Downlink scheduling in fractional frequency reuse (FFR) systems
  Randomly Featured Patents
Differential control unit for front and rear wheels of a 4-wheel drive vehicle
Multi-Resonance converter
PWM, Single-ended, separately driven d.c.-d.c. converter
Machine used for drilling, tapping and milling, and having an automatic tool changing system
Controlled deflection roll
Tiered shelf organizer
Method for quantitative video-microscopy and associated system and computer software program product
Directly induced swing for closed loop control of electroslag remelting furnace
Power supply switching circuit
Substituted benzophenones and their liquid mixtures suitable for use as photopolymerization initiators