Patent ID: 8490980
Filing Date: 2013-07-23
Classification: F01D,F05D,F16J

Abstract:
1. A seal arrangement for maintaining an axial pressure differential between relative high and low pressure stages along a rotating element, the arrangement comprising: a plurality of leaf or brush seal members forming a circumferential seal-pack around the rotating element, in-between said low and high pressure stages, for limiting leakage of fluid between said low and high pressure stages; a first baffle positioned on the upstream side of the seal-pack and a second baffle positioned on the downstream side of the seal-pack for regulating such leakage through the seal pack; and a control arrangement for adjusting the position of the first and second baffles to control the regulation of said leakage through the seal-pack and hence control the consequent blow-down effect on the seal-pack caused by that leakage, wherein the first and second baffles are axially movable in a fixed relation to one another.