Patent ID: 8544501

Claim:
An indexing arrangement including: a rotor; a stator spaced from the rotor; a rotary seal located between the rotor and the stator, with the seal being rotatable with the rotor; means for urging the rotary seal into sealing contact with the stator; ports in the rotor, in the stator and in the rotary seal; and connecting means for connecting respective ports in the rotor with respective ports in the rotary seal; and a flushing arrangement for flushing any fluid which leaks between the rotary seal and the stator out of the indexing arrangement, the flushing arrangement including an inner flushing chamber adjacent an inner circumference of the rotary seal and an outer flushing chamber adjacent an outer circumference of the seal, the inner and outer flushing chambers each having a flushing fluid inlet through which flushing fluid can be introduced and a flushing fluid outlet through which the flushing fluid and leaked fluid can be flushed, the arrangement being such that in use fluid can flow through the ports in the rotor, into the ports in the rotary seal via the connecting means, and out through the ports in the stator.