part 32 of the swivel is referred to by 29 whilst the l shaped arm on the outer part has reference number 30 in this embodiment a triple sealing arrangement of face seal type sealing rings is used an overlap of both l shaped arms is provided between the second and third seal and behind the third seal to prevent extrusion of the second and third sealing ring in fig6 a further embodiment is shown wherein each arm has a slanting surface the angle between the slanting parts of the arms being between 0 u00b0 and 90 u00b0 providing grooves for three conical type sealing rings the inner part 27 and outer part 26 are provided with an arm 34 having a slanting surface and with an u201c inverted u201d slanting arm 35 respectively sealings 37 are provided extending at an angle in between 0 u00b0 and 90 u00b0 relative to the axis 7 of rotation of the swivel discharge bores 24 25 are provided between the second and the third sealing 37 gaps 36 are provided which will decrease or substantially remain constant in size during increase of the fluid pressure in cavity 4 the above described embodiments naturally also cover swivels with the centre line axis of rotation placed at the opposite.