Abstract: A compressed air control device for a source of compressed air on motor vehicles, forming a unit of an electro-pneumatic unloader, an integrated electro-pneumatic multi-circuit control valve and an air-drier, comprising an inlet and an outlet provided in a common housing in which a chamber for the passage of compressed air is provided, the chamber being connected to the atmosphere via a controlled outlet valve in form of a safety valve in its opened position, a check valve being positioned downstream of the chamber, a means for alternatingly opening and closing the outlet valve and a plurality of control units of the same kind allocated to the respective circuits, the control units each comprising a check valve closing contrary to the flow direction and a means for controlled opening of the check valve.

Abstract: A levelling valve is provided for automatically keeping constant the vehicle height of a commercial vehicle with air suspension. The levelling valve comprises a spring loaded double valve body (17), an inlet seat (18), a hollow control rod (20) having an outlet seat (19) for the double valve body (17) and movable toward sealed engagement with the double valve body (17), an actuation drive (6) having a guiding member (27) and an eccentric follower (10) responsive to the change in vehicle height for moving the control rod (20) towards or away from sealing engagement with the double valve body (17). A first vehicle height according to a closing position may be controlled by the actuation drive (6). A control piston (28) is located in a control chamber (31) in alignment with the axis (3) of the control rod (20) and is provided for the attainment for setting of a second vehicle height. The control chamber (31) is located in the guiding member (27) of the actuation drive (6).

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 compressed air unloader for unloading compressed air used in the compressed air braking and suspension circuits of a motor vehicle is disclosed. The unloader includes a housing with an internal air chamber, an air inlet for passing compressed air into the air chamber, a compressed air outlet, and a controlled outlet valve in the compressed air outlet for venting compressed air in the air chamber to the atmosphere when the valve is opened. An electronic control unit opens and closes the outlet valve. The air chamber also has an air chamber check valve and a pressure sensor downstream of the check valve.

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.

Abstract: An operating brake valve for an electrically and pneumatically actuated braking system in a motor vehicle has a movable thrust piece (2) arranged within a housing (1) and a balance piston (4) actuated via a graduated spring (3), whereby a combined inlet/exhaust valve (7, 9, 10) is arranged downstream of the balanced piston. A position sensor (20) is provided which can be actuated via a push rod (17) connected to the thrust piece (2). A stop valve (29) is located in the connecting line (26) to the reservoir (12) or in the control line (15) coming from the balance chamber, whereby an electrically controlled solenoid valve (40) is provided for actuating the stop valve and, in the nonexcited state, for relieving the valve body of the stop valve (29) opposite to its closing direction.

Abstract: A leveling valve for the automatic stabilization of the chassis height of a vehicle, especially of a motor vehicle with pneumatic shock absorption, having a valve housing (1) with a spring-loaded double valve body (11), an inlet seat (16) for the double valve body (11), and a hollow valve plunger (25) carrying an outlet seat (26) for the double valve body (1), being movable in the axial direction, and being assigned to a gasket (22) disposed in a groove (21), which may be axially readjusted for the purpose of adjusting the locking position in relation to a supporting element (30) resting on a cam (43) of a shaft (48) that runs transversally to the central axis (2) of the valve plunger (25) and is torsion-proof. The position of the supporting element (30) in relation to the housing (1) may be changed by means of an actuating lever (45) disposed outside of the housing, swiveling and acting on the shaft (38).

Abstract: A level control valve for automatically keeping constant the vehicle height of a commercial vehicle with air suspension has a spring-loaded double valve body 22, an inlet seat 24 on the housing 2 and a hollow valve tappet 11 which bears an outlet seat 25 for the double valve body 22, is displaceable in a sealing manner, and the position of which relative to the housing 2 can be changed via an adjustment drive which senses the vehicle height. There is at least one port 6, provided on the housing 2, for a line 7 leading to an air suspension bellows 8 and a port 3 for a storage line 4 leading to the inlet valve 22, 24. The level control valve 1 has a shutoff and outlet valve 36, which can be controlled arbitrarily and independently of the adjustment drive and is of large cross-section, for the rapid lowering of the vehicle structure.

Abstract: A switch valve (1) connectable on the inlet side to a levelling valve (18) via control line (20) and also electrically activatable, which the positions raise, lower, drive and stop, possesses, on a housing (2), a supply connection (14) for a compressed-air source, an outlet (10) and at least one connection piece (11) for connection to a pneumatic-spring bellows (13), a slide (6) and a hollow double-valve body (24) being switchable in the housing (2) into the four positions via two switch pistons (4, 5) and two solenoid valves (37, 38) preceding these, and an inlet valve (24, 26,) an outlet valve (31, 35;32, 35, etc.) and a shutoff valve (27, 30) for the respective connection and isolation of the lines thereby being formed in the four positions. The hollow double-valve body (24) has a connection piece (21) located on the end face and intended for the control line (20) brought up from the levelling valve (18).