Tube compression fitting and flared fitting used with connection body and method of making same

Abstract

A high pressure tube compression fitting/flared fitting for use in combination with a thick-walled tube and a connection body wherein a sleeve is in engagement with a thick-walled tube. The sleeve is generally cylindrically shaped with the exterior thereof coated and then etched. The sleeve includes a sharp annular biting portion engaging the thick walled tube. The sleeve further includes an inner annular symmetric concavity which engages the thick-walled tube upon deformation thereof. The thick-walled tube includes a flared end portion. A gland about the thick-walled tube engages the sleeve forcing it into engagement with the frusto-conical portion of the connection body coupling the tube, tube fitting and connection body together. The flared end of the thick-walled tube interengages and seals the frusto-conical portion of the connection body.

1 - 18 . (canceled) 
     
     
         19 . A process for making a tube fitting for use in combination with a thick-walled tube comprising the steps of:
 placing an end portion of a thick-walled tube into engagement with a tube engaging surface of a frusto-conical portion of a die such that the inner diameter of said tube interengages said tube engaging surface of said frusto-conical portion of said die, said die supported by a driving piston;   sliding a sleeve over said tube, said sleeve includes an interior and an exterior, said exterior of said sleeve being having a coating thereover, said sleeve includes a sharp annular biting portion engaging said thick-walled tube, said sleeve includes an interior concavity, said concavity of said sleeve interengaging said thick-walled tube after deformation of said tube and said sleeve;   securing said sleeve into forceful engagement with said die;   driving said die into said thick-walled tube and said sleeve with said driving piston;   flaring said end portion of said thick-walled tube; and,   deforming said sleeve into engagement with said thick-walled tube.   
     
     
         20 . A process for making a tube fitting for use in combination with a thick-walled tube as claimed in  claim 19  wherein said coating on said sleeve is an XADC-Armoloy® coating. 
     
     
         21 . A process for making a tube fitting for use in combination with a thick-walled tube as claimed in  claim 19  wherein said sliding sleeve has a longitudinal axis, said extended lip portion includes a recess, said recess includes first and second legs, and said first leg being parallel to said longitudinal axis and said second leg being substantially transverse to said first leg, and said step of driving said die into said thick-walled tube includes forcing and engaging said sharp annular biting portion with said thick-walled tube deforming said tube into engagement with said recess in said extended lip. 
     
     
         22 . A process for making a tube fitting for use in combination with a thick-walled tube as claimed in  claim 19  wherein said coating on said exterior of said sleeve is etched. 
     
     
         23 . (canceled)