Housing with filter for purge valve protection

1. A pneumatic system for a vehicle comprising:

a compressor;

an air dryer cartridge; and

a purge valve;

wherein the purge valve is protected by a filter;

the filter being arranged in a housing which covers an inlet of an air channel formed in the housing which connects the inlet and the purge valve; and

wherein the filter comprises a loop disposed around a pin protruding from the housing, to hold the filter in place.

2. The system of claim 1 wherein the filter comprises a spring element which is pressed down by the air dryer cartridge and prevents the loop from slipping off the pin.

3. The system of claim 2 , wherein the filter comprises a substantially flat portion with a multitude of openings of a same size and the spring element is formed by a cantilever cut-out and protruding from the substantially flat portion.

4. The system of claim 3 , wherein the substantially flat portion has a shape of a ring segment when seen in a direction perpendicular to the substantially flat portion.

5. The system of claim 4 , wherein the loop extends from one side of the ring segment when seen in the direction perpendicular to the substantially flat portion.

6. The system of claim 4 , wherein the openings of the same size are grouped into at least two ring segments divided by a ring segment which is free of openings to increase the stability of the filter.

7. The system of claim 4 , wherein the filter is made of plastic.

8. The system of claim 4 , wherein the openings have a diameter in a range of 0.85 mm to 1.25 mm.

9. The system of claim 3 , wherein the substantially flat portion has an area that is larger than an area of a cross-section of the air channel perpendicular to the direction of flow of the filtered air.

10. The system of claim 9 , wherein the filter has a circumferential border extending in the direction of flow of the filtered air and enclosing a cavity upstream of the inlet.

11. A vehicle comprising the system of claim 1 .