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
High sensitivity stress sensor based on hybrid materials
Detection of procedural deficiency across multiple business applications
Systems and methods for printing images outside a normal color gamut in image forming devices
Digital photographing apparatus and control method for evaluating validity of an auto-focus operation
System and method for monitoring network activity
Aromatic amine derivative, organic electroluminescent element employing the same, and process for producing aromatic amine derivative
Multilayered material sheet and process for its preparation
  Randomly Featured Patents
Dual-band planar antenna
Magnetic head holder having protrusion portions thermally fusion-bonded to a magnetic head core
Process for the preparation of quinolonecarboxylic acid esters
Hybrid substrates and methods for forming such hybrid substrates
Lateral high-breakdown-voltage transistor having drain contact region
Circuit arrangement for generating an AC voltage from a DC voltage
Fluid-flow-control-switch valve
Asymmetric picture compression
Driver circuit of display device
Core plug formation die apparatus and method of manufacturing a core plug