Abstract: An air suspension system of a commercial vehicle comprises an electronic control device with a level control valve device. A valve element is coupled to a drive element mechanically coupled to a vehicle wheel or axle. In a first relative position of the valve element and a counter valve element, a port for an air suspension bellow is blocked. In a second relative position, the port for the air suspension bellow is connected to a port for an aeration device. In a third relative position, the port for the air suspension bellow is connected to a port for a deaeration device. Control logic generates a control signal for an actuator which, when a level change is set by an operator, correspondingly changes the relative position of the valve element and the counter valve element or the relative position of the counter valve element and a valve housing.

Abstract: A mechanically actuated level control valve device for a commercial vehicle with an air suspension system is a level control valve and comprises a drive element that can be mechanically coupled to a vehicle wheel or axle. A valve element and a counter valve element have a first relative position, wherein the port for the air suspension bellow is closed, a second relative position, wherein the port for the air suspension bellow is connected to the port for the aeration device, and a third relative position, wherein the port for the air suspension bellow is connected to the port for the deaeration device. The valve element is coupled to a rotatable driveshaft of the level control valve by a drive mechanism. An integrated actuator changes the relative position of the valve element and the drive element or the relative position of the counter valve element and a valve housing.

Abstract: An air suspension system of a commercial vehicle comprises an electronic control device with a level control valve device. A valve element is coupled to a drive element mechanically coupled to a vehicle wheel or axle. In a first relative position of the valve element and a counter valve element, a port for an air suspension bellow is blocked. In a second relative position, the port for the air suspension bellow is connected to a port for an aeration device. In a third relative position, the port for the air suspension bellow is connected to a port for a deaeration device. Control logic generates a control signal for an actuator which, when a level change is set by an operator, correspondingly changes the relative position of the valve element and the counter valve element or the relative position of the counter valve element and a valve housing.

Abstract: A mechanically actuated level control valve device for a commercial vehicle with an air suspension system is a level control valve and comprises a drive element that can be mechanically coupled to a vehicle wheel or axle. A valve element and a counter valve element have a first relative position, wherein the port for the air suspension bellow is closed, a second relative position, wherein the port for the air suspension bellow is connected to the port for the aeration device, and a third relative position, wherein the port for the air suspension bellow is connected to the port for the deaeration device. The valve element is coupled to a rotatable driveshaft of the level control valve by a drive mechanism. An integrated actuator changes the relative position of the valve element and the drive element or the relative position of the counter valve element and a valve housing.

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: 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: 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 service brake actuator having a housing base having a center portion and a housing cover having a center portion is provided. The center portion of the housing base and the center portion of the housing cover telescopingly fit together in an assembled position and define an annular space therebetween. A diaphragm having a thickness greater than the thickness of the annular space between the center portion of the housing base and the center portion of the housing cover is held in the annular space by radial forces generated by compression of the diaphragm in the annular space. It should be understood that the magnitude of the radial forces holding the diaphragm in the annular space is variable depending on the thickness of the annular space.

Abstract: A service brake actuator having a housing base having a center portion and a housing cover having a center portion is provided. The center portion of the housing base and the center portion of the housing cover telescopingly fit together in an assembled position and define an annular space therebetween. A diaphragm having a thickness greater than the thickness of the annular space between the center portion of the housing base and the center portion of the housing cover is held in the annular space by radial forces generated by compression of the diaphragm in the annular space. It should be understood that the magnitude of the radial forces holding the diaphragm in the annular space is variable depending on the thickness of the annular space.

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).

Abstract: A leveling valve, having a precision adjustment device, for use with the suspension system of a motor vehicle. The leveling valve includes a valve housing and an inlet-outlet valve positioned within the valve housing for directing pressurized fluid from a fluid reservoir through the valve housing to a fluid suspension bellows, the inlet-outlet valve being moveable from an open position into a closed position. An elongated control rod is positioned within the valve housing and sealed therein, one of the ends of the control rod being connected to the inlet-outlet valve, and the other of the ends of the control rod having a cam follower formed as a part thereof. The precision adjustment device includes a housing branch formed as a part of the valve housing, in which an elongated shaft formed about an axis and extending radially away from the control rod to outside of the housing branch is fitted.

Abstract: A connection piece (2) for the connection of a pipe (19) to a plastic housing (1) of a valve, comprises a threaded plug (4) made of metal, which is arranged in a plastic sleeve (3) of the housing (1). At least one circumferential projection (9) and one corresponding circumferential groove (10) are provided between the threaded plug (4) and the plastic sleeve (3). The threaded plug (4) is secured only in an axial manner and freely rotatable beared in the plastic sleeve (3) by the connection of the circumferential projection (9) and the corresponding circumferential groove (10). The threaded plug (4) is provided protruding the plastic sleeve (3) to the outside and comprises a gripping surface (17) for the supply of a tool.