Patent ID: 6905123
Filing Date: 2005-06-14
Classification: F16J

Abstract:
1. A gas seal for providing a seal between a first and a second relatively rotatable components comprising: a first seal face member mounted in rotationally fixed relationship and sealed with respect to the first component and a second seal face member mounted in rotationally fixed relationship and sealed with respect to the second component; the first and second seal face members being urged towards one another by a spring mechanism, grooves being provided in one of the first and second seal face members to create a hydrodynamic force opposing the load applied by the spring mechanism when one seal face member rotates relative to the other, and a stand-still seal acting to control a gas flow past the first and second relative rotatable components, the stand-still seal comprising a sealing element in sealing relationship with respect to the second component and being displaceable into direct sealing engagement with the first component when the first and the second components are stationary with respect to one another.