A compressed-air supply installation for operating a pneumatic installation includes a compressed-air feed, a compressed-air connection to the pneumatic installation, and a ventilation connection to a surrounding environment. The compressed-air supply installation further includes a pneumatic main line between the compressed-air feed and the compressed-air connection, the pneumatic main line having an air dryer, a ventilation line between the compressed-air feed and the ventilation connection, and a valve arrangement having a control valve configured to control a ventilation valve. The control valve is connected by a control valve connection in a pneumatic control line that is connected to a pressure control connection of the ventilation valve, the ventilation valve is connected by a ventilation valve connection in the ventilation line, and the control valve is assigned a control valve ventilation connection that is configured to be switchably connected to the ventilation connection or to the surrounding environment.

A system diagnoses and monitors air supply systems and includes a compressor with a drive, which is configured to provide pressurized air for the system, an air dryer, which is configured to remove moisture from the compressed air in the system, at least two sensors, wherein one sensor is configured and arranged to detect a status signal of a component to be monitored, and another sensor is configured and arranged to detect a reference signal relating to the component to be monitored, and an evaluation unit which is configured to evaluate the signals of the sensors. The evaluation unit is also configured to convert the sensor signals into maintenance and control signals based on an evaluation logic, which signals control the operating mode and the maintenance intervals of the air supply system.

An effluent processing apparatus comprises a housing having an inlet port and a chamber. A coalescing element is located in the chamber and arranged coaxially with the inlet port. The coalescing element has pleats in a predefined pattern of paths arranged to separate oil and water from an effluent mixture containing air, oil, and water. The effluent mixture flows into the inlet port along an axis of the coalescing element. The effluent mixture is deflected by a portion of the housing to flow perpendicular to the axis along major surfaces of the pleats to separate oil and water from the effluent mixture.

A compressed-air supply system for operating a pneumatic installation. The compressed-air supply system includes an air supply, the air supply comprising an air compressor unit configured to supply compressed air to a compressed air supply. The compressed-air supply system further includes a compressed air port to the pneumatic installation, an air removal port configured to release air to the environment, and a pneumatic main line between the compressed air supply and the compressed air port, the pneumatic main line comprising an air dryer and a throttle. Furthermore, the compressed-air supply system includes an air removal line between the compressed air port and the air removal port and an exhaust valve connected in the air removal line. The exhaust valve includes a pressure control port connected to the compressed air supply and a pressure counter control port connected to the compressed air port.

A pneumatic braking device for a utility vehicle includes at least one pneumatically controllable spring accumulator for a parking brake of the utility vehicle and an electronic parking brake device. The electronic parking brake device has at least one electronic control unit, at least one bistable valve unit, at least one first valve unit by which a parking brake of a trailer of the utility vehicle can be deactivated when activating the parking brake of the utility vehicle, at least one second valve device which can be connected in such a way that when there is a decrease in the system pressure for supplying the parking brake of the trailer, the parking brake of the trailer can be activated, and a traction vehicle protection valve.

A method (purge procedure) for purging a decoupled brake system including: a brake fluid reservoir, a master cylinder, a brake circuit connected to the wheel brakes, a pump equipped with a plunger. A segment of the brake circuit to be purged is isolated by closing the solenoid valves at the extremities of the segment, a vacuum is created with the plunger, and an extremity of this segment is placed in communication with the exterior to evacuate the trapped air bubble.

The invention relates to a compressed-air supply system for operating a pneumatic installation in a pneumatic system of a vehicle, comprising: a compressed-air feed; a compressed-air connection point to the pneumatic installation; a venting connection point to the environment; a pneumatic main line between the compressed-air feed and the compressed-air connection point, which pneumatic main line has an air dryer; a venting valve, which is arranged on the pneumatic main line and is designed as a pilot valve and has a pilot connection point; a compressor having at least one compressor stage; and, in addition to the pneumatic main line, a pilot valve and a pneumatic pilot channel that connects the pilot valve to the pilot connection point of the venting valve. With respect to the compressed-air supply system, according to the invention, a pressure-holding pneumatic reservoir device is connected to the pilot connection point, which reservoir device is designed to provide a control pressure for the pilot connection point, in particular independently of a pressure in the pneumatic main line during venting of the pneumatic system, and the pressure-holding pneumatic reservoir device has at least one separate pilot pressure accumulator, which can be pneumatically connected to the pilot connection point via the control line.

An air preparation device having an electronic control unit for supplying at least one load circuit of a vehicle with dried system air, includes an air dryer unit for drying compressed air produced by an pneumatically switchable compressor. The air dryer unit supplies the at least one load circuit with dried compressed air via at least one overflow valve. An electromagnetic regeneration valve is provided which is connected to the control unit and returns dried compressed air along a regeneration path through the air dryer unit in order to regenerate the air dryer unit. An electromagnetic compressor control valve is provided which is connected to the control unit, for switching the pneumatically switchable compressor on and off via a pneumatic switching port, on the basis of a system pressure measurement value determined by at least one pressure sensor and supplied to the electronic control unit as an input signal. For redundant pneumatic compressor activation, a pneumatically pilot-controlled further compressor control valve is provided, to which the system pressure or a pressure proportional thereto is applied at a control inlet in order to switch on the compressor by activation of the pneumatic switching port after the system pressure has dropped below a lower limit value.

An effluent processing device includes an input port to receive an effluent mixture containing air, oil, and water. One or more baffles are positioned between the input port and at least one air outlet to deflect the effluent mixture to assist in separating the oil and the water from the air. A member positioned below the one or more baffles selectively allows only oil of the separated oil and water to pass from a first side of the member through openings in the member to a second side of the member. A sump is arranged to receive and retain the oil on the second side of the member as the oil passes from the first side to the second side. The effluent processing devices includes at least one air outlet through which air is exhausted to atmosphere.

A device for monitoring humidity in a compressed air system comprises a light emitter; a light sensor; and a hygromorphic element. The hygromorphic element is exposed to a source of compressed air and positioned between the light emitter and the light sensor. The hygromorphic element changes the amount of light passing between the light emitter and the light sensor as the humidity in the compressed air increases.