Kevlar reinforced high pressure hose assembly with grip and environmental barrier
AssigneeTiteflex Corporation
InventorsJames M. Lalikos, Norman H. Desilets
Life of this patent
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Abstract
A high pressure (up to 8000 psi service) hose assembly has an inner core made of "Teflon" PTFE, covered by a "Kevlar" aramid reinforcing braid. The PTFE can, but the aramid cannot, withstand the attack of oils and other fluids which may be conveyed through the hose. Therefore, the aramid is covered by PTFE tape and the end of the hose is sealed inside an end fitting. In one embodiment, when the end fitting is swaged or otherwise manipulated to capture the hose, the PTFE inner core extrudes to complete the sealing of the hose end.
Claims25
A high pressure hose assembly comprising an inner core of material which withstands an attack by media conveyed through the hose, a layer of mechanically strong aramid yarn reinforcing material surrounding said inner core, said aramid yarn reinforcing material being subject to attack by said conveyed media or by media likely to be encountered in the environment in which said hose assembly may be used, an outer layer of attack-resistant material completely surrounding and encasing said aramid yarn reinforcing material, said outer layer being a tape made of a material taken from a group consisting of PTFE, nylon and high-density polyethylene, said tape being wrapped around and encasing said aramid yarn, a chafe sleeve covering said outer layer, and an end fitting, said end fitting having a shoulder stop against which an end of said hose abuts, said shoulder stop cooperating with said inner core and said outer layer to completely encase said aramid yarn to protect the end of said hose from said conveyed media and said media in the environment.
A high pressure hose assembly comprising an end fitting including an insert and a collar, said insert and collar having a space between them closed by a shoulder stop, means for mechanically locking together said insert and collar, a multi-ply hose bottomed against said shoulder stop and captured between said insert and collar, said multi-ply hose comprising a PTFE inner core surrounded by aramid braid and covered by PTFE tape, means for sealing an end of said multi-ply hose in said space defined by said insert, collar, and shoulder stop, said collar being captured against said insert to capture said multi-ply between them, said PTFE inner core extruding responsive to said capture to provide said sealing means, and vent means for expelling any fluid leaking from said hose at said end fitting without wetting said aramid braid sealed within said space, said vent means being positioned to be sealed by said extruding inner core to prevent a back-flow of said leaking fluid toward said aramid braid.
Dependencies are inferred from the claim text.