Patent ID: 7241109

Claim:
A seal system comprising: a rotor; a stator; first and second cavities defined between the rotor and the stator; and a plurality of seals for inhibiting a flow of gas through the cavities, wherein relative motion between the rotor and the stator causes the seals to open or close, one of the seals is arranged to open to increase the pressure in one of the first or second cavities and another seal is arranged to close to decrease the pressure in the other of the first or second cavities, wherein the plurality of seals includes a first cavity inlet seal, wherein each seal includes a first part and a second part, the first part being mounted on the stator and the second part being mounted on the rotor, wherein the first part of the first cavity inlet seal faces radially inwardly and the second part of the first cavity inlet seal faces radially outwardly.