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

Image Number 2 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
Movable assemblies for an image reader unit and a cover unit in an image formation apparatus
Target output device and extreme ultraviolet light source apparatus
Integrated advance copper fuse combined with ESD/over-voltage/reverse polarity protection
Method and apparatus for supporting management actions for very high throughput in wireless communications
Medicament delivery device and a method of medicament delivery
Process for recovering and recycling an acid catalyst
  Randomly Featured Patents
Pressure relief valve
Baking board
Windshield wiper apparatus
Memory back up system with one cache memory and two physically separated main memories
Timing analysis using statistical on-chip variation
Method and apparatus for indicating leakage in compressed air line
Tetrahydroquinoline azo triazole dyestuffs
Method for measuring the absolute steering angle of steering shaft for vehicle
Pressure sensor with pressure translation
Paint spray gun