| 摘要 |
A sealing system for a rotatable fluid conduit coupling or swivel, in particular a swivel for the off-shore oil and gas exploitation or the like, the coupling comprising an inner or first part, an outer or second part concentrically surrounding the first part, an annular chamber formed by the opposite outer and/or inner walls of the inner and outer parts respectively, the chamber being connected to a fluid conduit in the first part and a fluid conduit in the second part, and a clearance between the parts on either side of the chamber which clearances each are sealed by at least one sealing ring located in an annular recess in one and/or the other of the opposite walls forming the clearance, the sealing ring being of resilient low friction material and of the type which allows flexing of the seal lips under over pressure in the clearance from the side of the chamber beyond the pressure behind the sealing ring, the improvement being that in the recess the sealing ring cooperates with or has been provided with means which limit the degree of flexible deformation in case reverse pressure occurs over the sealing ring.
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