Abstract: The invention relates to a coaxial coupling which comprises a male part (501) and a female part (502) and comprises a bypass valve (218) so that the female part (502) can be decoupled from the male part (501) while pressurized fluid passes through the female part (502). The nipple pipe (105) of the male part (501) pushes a spring-loaded valve (218) in the female part (502) over said rear holes (301) in the inner pipe (2) of the female part. The female part (502) has a rotatable locking sleeve (207), which is coupled to a sleeve (214) accommodating pins (213).

Abstract: Hose coupling incorporates male part and a female part being provided with elements which in corporation with a slide axially displaceable sleeve on the female part renders possible pressure relief at disconnection. These elements are constituted by an angular locking pawl one portion of which is insert able in an axial groove in the female part and has such length that always at least some part thereof is surrounded by the sleeve. The other inwardly directed part of the locking pawl has such length that it extends into the groove of the male part when locking pawl is influenced by the sleeve. The locking pawl is a combined element. To lock the male part when the coupling is connected and lock the male part in an alternative position when it's pressure relieved.