High pressure screwed joint for fuel pipe line, has convex end of fuel pipe line which is pressed with nut against annular sealing surface of another fuel pipe line

摘要

The high pressure screwed joint has a convex end of a fuel pipe line which is pressed with a nut against an annular sealing surface of another fuel pipe line. A contact surface of convex end or the annular sealing surface is coated with a metal with a physical-vapor-deposition (PVD) or a chemical vapor deposition (CVD) method. The metal is silver or copper or indium or aluminum or brass.