Valve arrangement for controlling an air suspension, a valve unit, and a vehicle provided with such devices

Valve arrangement for multi-axle vehicles having air suspension, which vehicle is provided with at least one axle ( 1, 2, 3 ) having two or more air suspension elements ( 4,5, 6,7, 8, 9, 30 ) which can be pressurized by means of a source of compressed air ( 10 ), valves ( 13,14,15,16,17,18 ) for pressurizing or venting said air suspension elements, and a control unit ( 25 ) for controlling opening and closing of said valves. A valve unit can also be provided for each air suspension element, which valve unit comprises a first valve ( 15 a , 16 a, 44 ) between the source of compressed air ( 10 ) and the air suspension element ( 4, 5,6,7,8, 9, 30 ), for pressurizing said air suspension element, and a second valve ( 15 b , 16 b, 49 ) connected between the first valve and the air suspension element, for venting said air suspension element, which valves are normally closed. The invention further relates to a valve unit for said valve arrangement and a vehicle provided with such a valve arrangement.