Tube fitting with integrated seal

摘要

A tube for a fuel injection system having an end form defining a spherical surface to seal against a receiver in fluid tight relation. The tube and end form may be made of steel or stainless steel. The spherical surface includes an integrated seal surface defining layer comprising material bonded to the spherical surface, which has a hardness lower than the hardness of the material of the end form and may comprise copper, copper-nickel alloy, copper alloy, nickel or manganese. In alternative forms, the material is deposited on the end form spherical seal surface by various processes including deposition by heating, using moistening effects, galvanic, evaporation, or any other suitable deposition process.

主权项

1. A tube having an enlarged end form defining a spherical surface, the end form being a separate element attached to said tube end in fluid tight relation, and a seal surface defining layer integrally formed on said spherical surface comprising a material dissimilar from the material of said end form material, wherein said material of said seal surface defines layer has a hardness lower than the hardness of the material of said end form.