PERFECCIONAMIENTOS EN HERMETIZACION DE PARTES ROTATIVAS.

摘要

A seal for the shaft of a ship comprises a holder for two axially spaced sealing rings one of which first engages the rotatable part and the other is a spare ring which if the ring first engaging the rotatable part becomes defective can, by relative axial movement between the holder and the rotatable part, be moved into sealing relation with the rotatable member.