Direct sealing coupling

Claim 1

A direct sealing coupling for engaging a body with a sleeve to form sealing by fastening force, the body comprising a substantially flat body having a sealing surface at one end a borethrough and a male thread; the sleeve having a bore therethrough and having at one end a flange which comprises with an annular projection at one side to act as a belleville spring, the flange having at the other side a sleeve sealing surface which has a conical shape which is deformable to be substantially flat when pressed; a connecting portion of the body and the sleeve being surrounded by a female nut, a female thread of which is engaged with said male thread on the body, thereby forming a seal between the body sealing surface and the sleeve sealing surface at the juncture of said bores, said bores being of the same size thereby providing a smooth uninterrupted path through said body and sleeve without circumferential dead space when a fastening force is applied onto the annular projection of the flange, a thrust bearing being provided between the female nut and the annular projection whereby to prevent rotation of the sleeve with the female nut when the fastening force is applied.