Abstract: The invention relates to a lift axle valve unit of any type for lifting or lowering a lift axle of a utility vehicle having an air suspension. According to the invention, the lift axle valve unit comprises a heating device. By means of the heating device it Is possible to heat the lift axle valve unit when using the utility vehicle in regions and in wintertime with low temperatures. The heating device comprises a heating element built with a heating rod or a heating mat.

Abstract: The present invention relates to an air dryer cartridge designated for an air dryer of a utility vehicle. The air dryer cartridge comprises a supporting element. At least one spring is interposed between a supporting element and a pressing element for a desiccant. The supporting element is movable with respect to a housing of the air dryer cartridge. The supporting element is freely accessible from the outside of said air dryer cartridge. The present invention in particular provides the option to use the at least one spring both for pressing the desiccant as well as for clamping the air dryer cartridge in an air dryer.

Abstract: The present invention relates to a coupling head for coupling a towing vehicle to a trailer. According to the invention, in the coupling head a filter element is used. The filter element is bypassed by a continuously open by-pass. Preferably, the path through the by-pass has at least one redirection in the region of an undercut. As a result of the redirection, contaminants in the compressed air are not or not fully transferred through the by-pass. The by-pass might also ensure a supply of compressed air to the trailer, for example, when the filter element is at least partly blocked due to the contaminants. According to the invention, a valve element used to open the by-pass in the case of increasing blockage of the filter element is not required.

Abstract: An air processing device for a utility vehicle includes a compressor and two air dryer cartridges. The air dryer cartridges are located in two parallel paths. A control unit controls a regeneration of one of said air dryer cartridges independent from a load phase of the other of said air dryer cartridges.

Abstract: The present invention relates to an air dryer cartridge designated for an air dryer of a utility vehicle. The air dryer cartridge comprises a supporting element. At least one spring is interposed between a supporting element and a pressing element for a desiccant. The supporting element is movable with respect to a housing of the air dryer cartridge. The supporting element is freely accessible from the outside of said air dryer cartridge. The present invention in particular provides the option to use the at least one spring both for pressing the desiccant as well as for clamping the air dryer cartridge in an air dryer.

Abstract: The invention relates to a lift axle valve unit of any type for lifting or lowering a lift axle of a utility vehicle having an air suspension. According to the invention, the lift axle valve unit comprises a heating device. By means of the heating device it Is possible to heat the lift axle valve unit when using the utility vehicle in regions and in wintertime with low temperatures. The heating device comprises a heating element built with a heating rod or a heating mat.

Abstract: The present invention relates to a coupling head for coupling a towing vehicle to a trailer. According to the invention, in the coupling head a filter element is used. The filter element is bypassed by a continuously open by-pass. Preferably, the path through the by-pass has at least one redirection in the region of an undercut. As a result of the redirection, contaminants in the compressed air are not or not fully transferred through the by-pass. The by-pass might also ensure a supply of compressed air to the trailer, for example, when the filter element is at least partly blocked due to the contaminants. According to the invention, a valve element used to open the by-pass in the case of increasing blockage of the filter element is not required.

Abstract: An air processing device for a utility vehicle includes a compressor and two air dryer cartridges. The air dryer cartridges are located in two parallel paths. A control unit controls a regeneration of one of said air dryer cartridges independent from a load phase of the other of said air dryer cartridges.

Abstract: A cartridge of an air dryer serves for cleaning compressed air to be used in compressed air supply systems of motor vehicles, especially trucks. The cartridge includes a housing, a pre-filter, a deposit chamber, a coalescing filter, a bypass conduit and a check valve. The deposit chamber is located downstream of the pre-filter. The deposit chamber is filled with a treating substance. The coalescing filter is arranged between the pre-filter and the deposit chamber. The bypass conduit is designed and arranged to bypass the coalescing filter and not to bypass the pre-filter. The check valve is arranged in the bypass conduit in a way that it opens during regeneration of the cartridge.

Abstract: The present invention relates to a compressed air processing system. The compressed air processing system includes an inlet connection, a pressure control unit, a multi-circuit protection valve, a plurality of outlet connections, a parking brake connection, an electronic control unit and a valve arrangement. The inlet connection is connected to a conduit coming from a compressor. Each of the outlet connections is connected to a circuit (I, II, and so forth). The parking brake connection is connected to a conduit coming from a parking brake cylinder. The electronic control unit includes an electric input connection for a control signal. The valve arrangement aerates and locks the parking brake connection in a controlled way due to a signal being generated by the electronic control unit. The valve arrangement also deaerates the parking brake connection due to a signal being generated by the electronic control unit.

Abstract: A compressed air processing apparatus includes a pressure controller, an air dryer, a multi-circuit protection valve and an electronic control unit. A switching valve is designed and arranged to supply compressed air to an air suspension system and to deaerate the air suspension system. The electronic control unit is designed and arranged to control the pressure controller, the air dryer and the multi-circuit protection valve. The electronic control unit is designed and arranged to also control the switching valve of the air suspension system.

Abstract: A compressed air processing system for motor vehicles includes a pressure control unit, an air dryer, a multi-circuit protection valve and an electronic control unit. The electronic control unit controls the valves of the pressure control unit, the valves of the air dryer, the valves of the multi-circuit protection valve and the valves of an air suspension system of the motor vehicle.

Abstract: The invention relates to an adaptation of a level of an air suspension element of a vehicle from a starting level to a desired level. Usually, such adaptation is done by opening a control valve connecting an air container with the air suspension element for an opening interval. According to the invention, a control unit determines an estimate for a future point in time for a suitable closing time of the valve. The estimate is determined considering a desired future level, actual loading conditions of the vehicle and an actual pressure level of the air container.

Abstract: A cartridge of an air dryer serves for cleaning compressed air to be used in compressed air supply systems of motor vehicles, especially trucks. The cartridge includes a housing, a pre-filter, a deposit chamber, a coalescing filter, a bypass conduit and a check valve. The deposit chamber is located downstream of the pre-filter. The deposit chamber is filled with a treating substance. The coalescing filter is arranged between the pre-filter and the deposit chamber. The bypass conduit is designed and arranged to bypass the coalescing filter and not to bypass the pre-filter. The check valve is arranged in the bypass conduit in a way that it opens during regeneration of the cartridge.

Abstract: A compressed air control apparatus for compressed air systems of motor vehicles includes a pressure controller (2), an air dryer (4) and a multi circuit protection valve (3). The pressure controller (2) controls the pressure in the compressed air control apparatus. The pressure controller (2) includes an outlet valve (8). The air dryer (4) dries the compressed air flowing through the compressed air control apparatus. The multi circuit protection valve (3) supplies a plurality of circuits (I, II, III, IV, V) with compressed air. The multi circuit protection valve (3) includes a plurality of overflow valves (23), at least one solenoid valve (32) and a regeneration conduit (36). Each of the overflow valves (23) is associated with one of the circuits (I, II, III, IV, or V). The at least one solenoid valve (32) arbitrarily operates the overflow valve (23), and it controls a regeneration phase of the air dryer (4) in which water is removed from the air dryer (4).

Abstract: A compressed air control apparatus for compressed air systems of motor vehicles includes a pressure controller (10) for controlling the pressure, an air dryer (6) for drying the compressed air flowing through the compressed air control apparatus and a multi circuit protection valve (9) for supplying a plurality of circuits (I, II, III, IV, V) with compressed air. The multi circuit protection valve (9) includes at least one solenoid valve (35) including a deaerating connection (15) leading to the atmosphere and a plurality of overflow valves (18). Each of the overflow valves (18) is associated with one of the circuits (I, II, III, IV or V). The overflow valves (18) include a valve body (20), a flow chamber (23), a rear chamber (34), a first effective surface (22), a second effective surface (27), a third effective surface (33) and a spring (31) being located in the rear chamber (34). The valve body (20) separates the flow chamber (23) from the rear chamber (34).

Abstract: A compressed air distributing apparatus for compressed air systems of motor vehicles includes a multi circuit protection valve (9) for supplying a plurality of circuits (I, II, III, IV, V) with compressed air. The multi circuit protection valve (9) includes a first solenoid valve (36) and a second solenoid valve (37). Each of the solenoid valves (36, 37) includes a deaerating connection leading to the atmosphere. A plurality of overflow valves (18) includes a valve body (20), a flow chamber (23), a rear chamber (34), a first effective surface (22), a second effective surface (27) and a spring (31) being located in the rear chamber (34). The valve body (20) separates the flow chamber (23) from the rear chamber (34). Each of the overflow valves (18) is associated with one of the circuits (I, II, III, IV, or V), and its opening pressure is greater than its closing pressure to allow for limited backflow.

Abstract: A pneumatic switching valve (1) for systems for lifting and lowering the body of a vehicle including air suspension includes a mechanical actuation element (33) for adjusting a lifting position, a lowering position, a driving position and a stop position associated with respective positions of the vehicle. An inlet valve (11), an outlet valve (12) and a locking valve (13) each include a valve body (24), a tappet (26) and a closing spring (27). The inlet valve (11) and the outlet valve (12) are arranged in one common plane to face in opposite directions. The closing springs (27) of the inlet valve (11) and of the outlet valve (12) also serve to move the actuation element (33) from the lifting position or from the lowering position to the stop position when the operator releases the actuation element (33).

Abstract: A control system is designed to lift and lower the body of an air-suspended vehicle including an axle and level control.

Abstract: A trailer brake valve (1) is to be mounted in a compressed air brake system of a trailer of a truck. The brake system of the trailer includes an anti lock control unit and a load sensing control unit. The trailer brake valve (1) includes a housing (2), a relay piston (3) being movably guided in the housing (2) and a control chamber (4). A brake chamber (5) includes connections (31) for conduits leading to brake cylinders (33) of the brake system. The control chamber (4) and the brake chamber (5) are defined by the relay piston (3). A brake conduit (7) is connected to the control chamber (4). A reservoir chamber (47) and an outlet valve (43, 54) are located in the housing (2) and an inlet valve (43, 51) is located adjacent the reservoir chamber (47). A first solenoid valve (8) is arranged in the brake conduit (7) and a second solenoid valve (18) is designed and arranged to deaerate the control chamber (4).