Filter with cyclone separation means

1. A filter for filtering a working fluid comprising:

a canister having an inlet and an outlet connected to an apparatus operable to supply compressed air to an air-powered system in a vehicle;

a first partially perforated generally conical member positioned in said canister;

a second generally conical member positioned inside said first partially perforated generally conical member, whereby the working fluid upon entering the inlet is caused to spin inside the canister, to pass through a perforated portion of the first generally conical member, to enter an inlet to the second generally conical member, to spin within the second conical member and to pass through the outlet, characterized in that the filter is cooled by a coolant.

2. The filter as claimed in claim 1 wherein the inlet to the canister is located such that the working fluid enters the canister tangentially, causing the working fluid to spin.

3. The filter as claimed in claim 1 wherein the first generally conical member comprises a cylinder at a narrow end thereof.

4. The filter as claimed in claim 3 wherein the narrow end of the second generally conical member is positioned inside the cylinder.

5. The filter as claimed in claim 1 wherein the inlet to the second generally conical member comprises a plurality of ducts.

6. The filter as claimed in claim 1 wherein the outlet of the canister comprises an element which extends into the second generally conical member such that working fluid entering the second generally conical member is not able to exit through the outlet immediately.

7. The filter as claimed in claim 1 wherein the canister is provided with a pressure valve whereby debris is purged periodically, once a given pressure is reached.

8. The filter as claimed in claim 1 wherein the coolant is provided in a coolant jacket which surrounds at least part of the canister.