Patent ID: 8646713

Claim:
A gyratory crusher, comprising: an outer crushing shell and an inner crushing shell forming between them a crushing chamber, the crushing chamber communicating with a discharge zone that forwards crushed material from the crushing chamber and out of the crusher; the inner crushing shell being supported on a crushing head; the outer crushing shell being supported on a crusher frame; at least one sealing arrangement between the discharge zone and a working part zone in which at least one bearing for the crushing head to perform a gyratory movement relative to the crusher frame is arranged, wherein the sealing arrangement includes a sealing surface, and a sealing member arranged to seal against the sealing surface and including an inner circumferential flexible sealing lip, an outer circumferential flexible sealing lip and at least one inlet for pressurized fluid to be supplied to an overpressure zone arranged between the inner and outer sealing lips and the sealing surface, one of the sealing member and the sealing surface being arranged in connection to the crushing head, and the other of the sealing member and the sealing surface being arranged in connection to the crusher frame.