Abstract: A coupling device including a casing part and a nipple part both provided with a flow-through channel. The nipple part is designed to be inserted into the flow-through channel of the casing part to open a spring-loaded shut off valve and thereby open a flow-through path through the coupling. The nipple part is designed to hold the valve and flow through path open and the two main parts connected to each other and is releasably engaged in a ball locking device or similar locking device in the casing part. The valve comprises two cooperating parts, both of which, under the influence of the nipple part, are axially movable in the channel both relative to each other and relative to the channel.

Abstract: A sealing ring has an annular, at least substantially stiff core and therearound an elastically sealing sheath which is glidable on the core. At least one annular part with an internal space adapted to the cross section of the core is attached around the core by means of mutually connected circumferential portions. The mutual connection of the sheath portions is provided by means of at least one annular fastening member, concentric with the core and made of a harder material than the sheath material. The fastening member is in mutual engagement with the sheath portions for keeping together and stiffening them.