Patent ID: 6390478
Filing Date: 2002-05-21
Classification: F16J,F16L

Abstract:
A swivel for use in transferring at least one fluid, comprising:inner and outer, mutually rotatable swivel members having respective inner fluid paths communicating with each other through at least one associated annular space at an interface between the swivel members, a radially movable ring element located in a peripheral groove in a first one of the swivel members, a static seal placed between the ring element and a second one of the swivel members, a dynamic seal placed in a ring groove in the first swivel member, such that the dynamic seal is located between the ring element and side walls of the peripheral groove, so that the first swivel member is rotatable in relation to the ring element and the second swivel member, and a barrier liquid supply communicating with said static and dynamic seals, and adapted to provide a barrier liquid at a relatively higher pressure than the at least one fluid to be transferred by the swivel, to hydraulically activate said static and dynamic seals.