US 5,310,227 AGranted

High pressure flex fitting

AssigneeNavistar International Transportation Corp.

InventorJames J. Grinsteiner

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Abstract

A high pressure flex fitting comprises a tube assembly which engages within a fitting body. The tube assembly comprises a tube upon which a deformable flanged compression sleeve is disposed adjacent an elastomeric sealing ring which in turn is adjacent a retainer ring, the retainer ring being seated adjacent a flared end of the tube. A nut having an end flange engages over the sleeve and the flange on the nut bears against the radial flange on the sleeve, pushing the sleeve on the tube into the fitting body when the nut is threadedly engaged onto the fitting body. The fitting body includes a large cavity, within which the flared end of the tube is suspended, have a tapered inner entrance section from an entrance diameter larger than the sleeve to an inner diameter smaller than the sleeve to completely fill the area between the cavity wall and the tube adjacent the sealing ring which effects the seal between the cavity wall and the tube to prevent extrusion and fracturing thereof.

Claims19

Dependent claims

A high pressure flex fitting assembly comprising:

a fitting body including a fluid passage therethrough, said fitting body having a wall defining an internal cylindrical cavity having an inside diameter communicating with said passage and having a threaded exterior surface;
and
a tube assembly having an enlarged end disposed within said cavity and including a tube upon which a retainer ring, an elastomeric sealing member, a compression sleeve, and an internally threaded nut are disposed sequentially from said enlarged end of said tube assembly, said compression sleeve having a deformable cylindrical end portion disposed adjacent said elastomeric sealing ring, said cylindrical portion of said sleeve having an outer diameter larger than the inside diameter of said cavity wall, said threaded nut upon being engaged with said threaded fitting surface having an end flange operatively engaging said sleeve to push said sleeve into said cavity against the elastomeric sealing member to a point at which said compression sleeve is deformed and an interference fit between said sleeve and said cavity wall is obtained, and said elastomeric sealing ring having its inner and outer diameters of such dimension relative to said tube that upon insertion within said cavity, said elastomeric sealing ring becomes compressed to effect a seal between said elastomeric sealing ring and said cavity wall and between said elastomeric sealing ring and said tube.

Dependencies are inferred from the claim text.