182 results about "Air brake" patented technology

The invention relates to the technical field of thread rolling machining, and discloses penetrating rod thread rolling equipment for an automobile air brake, the penetrating rod thread rolling equipment comprises a plurality of sets of thread rolling mechanisms which are sequentially connected in series, and each thread rolling mechanism comprises a feeding assembly, a thread rolling machining assembly, a discharging assembly, a feeding assembly and a detecting assembly; the detection module is used for detecting materials, the discharging module is used for discharging unqualified materials, and qualified materials can enter a thread rolling station; the thread rolling machining assembly is used for conducting thread rolling machining on the materials at the thread rolling station. The hopper in the subsequent thread rolling mechanism is in butt joint with the discharging assembly in the previous thread rolling mechanism. Three sections of threads are machined at a time by splicing the three thread rolling mechanisms, automatic conveying is achieved between the adjacent thread rolling mechanisms, materials do not need to be manually conveyed in sequence, the production efficiency is remarkably improved, and manual intervention is reduced; before entering the thread rolling process, the penetrating rod is subjected to at least one detection, defective products are eliminated, and the production requirements of high-precision parts are met.

The application relates to a high-sealing fireproof air brake for a ship, which comprises a frame, a plurality of square blades for closing a ventilation channel in the frame after rotation, and a driving device; hollow edge columns are arranged on two inner side walls of the frame located on both sides of the air flow direction of the ventilation channel; first water through holes are arranged on the two hollow edge columns, and water injection pipes are communicated with the two hollow edge columns; the square blades are hollowly arranged and both ends of the square blades are provided with second water through holes; when the ventilation channel in the frame is closed after the rotation of the square blades, the two square blades located at the most edge are communicated with the corresponding hollow edge columns through the second water through holes of the square blades and the first water through holes of the corresponding hollow edge columns, and the second water through holes of the two adjacent square blades are communicated. The application has the advantages of high sealing.

The utility model discloses a pneumatic silencing valve for PCTC, including silencer casing and air brake casing, the outside fixed support platform of silencer casing, the middle part rotationally connected with the main shaft of air brake casing, the rotationally connected with four driven shafts in air brake casing, every two driven shafts equidistance distribution are in the both sides of main shaft, and the air brake blade is fixed with in the outside of main shaft and driven shaft, and the end part that extends to the outside of air brake casing is fixed with crank no.1 in the main shaft and the driven shaft of being in the first, third position, and the end part that extends to the outside of air brake casing is fixed with crank no.2 in the driven shaft of being in the second, fourth position, and one side of air brake casing is provided with connecting rod no.1, connecting rod no.2 and connecting rod no.3. Air brake adopts two -way alternate open -close blade group, and five -piece blade group is driven by the main shaft, and the odd -numbered blade and even -numbered blade form reverse rotation mechanism, and the concentrated eddy current that alternately opens and shuts mode effectively avoids the traditional same -direction opening and closing, and reduces local turbulent energy loss.

The invention relates to the technical field of hydrogen fuel cells, in particular to a locomotive hydrogen fuel cell, an air braking system and a centralized air supply method of the locomotive hydrogen fuel cell and the air braking system. Comprising a first buffer air cylinder and a second buffer air cylinder which are located in the center of a system, one end of the first buffer air cylinder is connected with one end of the second buffer air cylinder, a second check valve is arranged on a connecting pipeline, a pressure sensor is arranged at the end of the extending end of the connecting pipeline, and one end of the first buffer air cylinder is connected with a fuel cell through a pipeline. A pressure reducing valve is arranged on a pipeline connecting the first buffer air cylinder and the fuel cell, the other end of the first buffer air cylinder is connected with an air compressor through a pipeline, an air purifying device and a first check valve are arranged on a pipeline connecting the first buffer air cylinder and the air compressor, and the other end of the second buffer air cylinder is connected with an air braking system. The system is provided with a plurality of air compressor sets, and normal operation of the locomotive cannot be affected even if a single air compressor breaks down.

The utility model discloses a loader braking system, and belongs to the technical field of engineering machinery. The loading machine braking system overcomes the defect that in the prior art, due to the failure of a traditional loading machine braking system, vehicle braking cannot be achieved even if a brake is stepped down. The main structure of the device comprises an air storage assembly, an air outlet of the air storage assembly is connected with an electric control brake valve and an air brake valve, the electric control signal end of the electric control brake valve is connected with an electric control pedal through a controller, and air outlets of the electric control brake valve and the air brake valve are connected with air inlets in the two ends of a pressure selection assembly respectively. An air outlet of the pressure selection assembly is connected with the rear axle brake caliper and the front axle brake caliper through the booster pump. The utility model is mainly applied to engineering machinery such as loaders and the like.

The invention provides a method for generating performance degradation data of a train air braking system. The method comprises the following steps: on the basis of a brake system of a preset model, analyzing three stages of pressure rise, maximum pressure and pressure stability of pressure change of a brake cylinder, and extracting a plurality of typical fault modes; based on an extended random process model with non-monotonicity and independent incremental property, three stages of pressure change of a brake cylinder and multiple typical fault modes are combined, and linear, nonlinear or stepped performance degradation process modeling of the train air brake system is carried out; overlapping normal distribution random noise on a performance degradation track generated by modeling, simulating a control precision error of an actual braking system, and optimizing a performance degradation process model of the train air braking system; and utilizing the train air braking system performance degradation process model to generate train air braking system performance degradation data in batches.

A safety device including a pneumatic conductor and a pneumatic valve, the pneumatic conductor configured to be connected at a first end of the pneumatic conductor to the pneumatic valve and the pneumatic conductor configured to be connected at a second end to a second valve, wherein the second valve is configured to be pneumatically connected to an air brake system, wherein the pneumatic valve is opened to activate the air brake system and closed to de-activate the air brake system.

This invention belongs to the field of vehicle suspension technology and discloses a double wishbone independent suspension system and a vehicle. The double wishbone independent suspension system includes a frame assembly and a steering mechanism. The steering mechanism includes a steering knuckle, a shock absorber assembly, an upper control arm assembly, an air brake disc assembly, a lower control arm assembly, and a rack and pinion steering assembly. The shock absorber assembly is located on the side of the frame assembly; the upper control arm assembly is connected to the upper part of the shock absorber assembly and the steering knuckle; the air brake disc assembly is spaced behind the shock absorber assembly in a first direction; the lower control arm assembly is connected to the frame assembly and the steering knuckle, and the lower part of the shock absorber assembly is connected to the lower control arm assembly; the tie rod of the rack and pinion steering assembly is located below the lower control arm assembly and connected to the steering knuckle. This double wishbone independent suspension system can improve the vehicle's suspension comfort and handling stability, and can ensure the vehicle's braking reliability.

A system and a method includes one or more processors to control operation of an air brake system having plural braking devices each disposed on a different vehicle of a vehicle system and configured to control braking efforts in the air brake system via the braking device disposed onboard the corresponding vehicle. The one or more processors may communicate one or more command messages to the braking devices to control one or more of a rate of a braking effort propagation along the vehicle system or a direction of the braking effort propagation between the plural braking devices.

1. The name of the design product: pump part of air compressor. 2. The use of the design product: the overall product is an air compressor mounted on a vehicle or the like, which supplies compressed air to a pneumatic device such as an air brake, and the claimed part is the pump part of the air compressor. 3. The design points of the design product: in the shape of the claimed part. 4. The picture or photograph best indicating the design points: perspective view 1. 5. Other circumstances requiring explanation: the design product requires partial design protection, the part other than the purple covered part is the claimed part, and the purple covered part is not the claimed part.

This invention relates to a method, apparatus, equipment, and storage medium for detecting air brake faults in subway vehicles, belonging to the field of fault diagnosis technology. The method involves: acquiring in-stock data of subway vehicles based on in-stock screening rules; setting the inflation / deflation cycle duration T under normal operating conditions for the subway train; extracting and processing in-stock data for duration T to obtain a training dataset; dividing the data in the training dataset into normal data and fault data based on the subway vehicle's operation and maintenance data to establish an air brake fault detection model; acquiring the data to be detected during subway vehicle operation; importing the data to be detected into the air brake fault detection model to obtain the detection results. This method achieves multi-dimensional detection of subway vehicles through multi-dimensional in-stock data, effectively improving the accuracy of fault detection in the air brake system of subway vehicles.

The embodiment of the application provides a kind of multi-axis flatcar air brake system, comprising: multiple unit brakes, flatcar total wind pipe, flatcar train pipe and parking control subsystem.Unit brake has brake state, release state and parking state.Parking control subsystem includes parking control pipeline and parking air cylinder assembly, parking control pipeline is connected respectively flatcar total wind pipe and each unit brake parking interface, parking air cylinder assembly is set on parking control pipeline, when parking air cylinder assembly interruption provides parking release air for unit brake, unit brake is in parking state.Brake control subsystem includes brake pipeline and the air path control assembly set on brake pipeline, brake pipeline is connected respectively flatcar train pipe and each unit brake brake interface, air path control assembly is used to control to provide air pressure to unit brake or pass through the passage of unit brake to exhaust air to atmosphere, to adjust unit brake to brake state or release state.

The invention relates to a free-marshalling heavy haul train longitudinal dynamics simulation method and device, computer equipment, a computer readable storage medium and a computer program product, and can be applied to the technical field of computers. The method comprises the steps that vehicle serial number information, control signal information and time sequence information are input into a pre-trained braking simulation model for air braking force prediction processing, and air braking force information is obtained; constructing a longitudinal dynamic model according to the air braking force information, the traction force information, the operation resistance information and the coupler force information; determining acceleration information and displacement information of each section of vehicle through a longitudinal dynamic model; and performing iterative simulation processing on all the vehicles according to the acceleration information, the displacement information and the total number of the vehicles and the total simulation time in the simulation parameters to obtain a longitudinal dynamic simulation result of the target heavy haul train. By adopting the method, the accuracy of longitudinal dynamics simulation processing of the heavy-load train can be improved.

The utility model relates to the field of air brake maintenance, and discloses a lifting mechanism and an air brake maintenance transition platform, the lifting mechanism comprises a main body component, the main body component comprises a support cylinder, a first lifting assembly installed in the support cylinder, and a second lifting assembly installed in the first lifting assembly, the power assembly and the supporting component are installed on the outer side of the supporting cylinder, the supporting component comprises a base installed on the outer side of the supporting cylinder and supporting feet installed on the outer side of the base, the first lifting assembly can ascend and descend in the supporting cylinder, the second lifting assembly can ascend and descend in the first lifting assembly, and the first lifting assembly can ascend and descend in the second lifting assembly. The power assembly provides power for lifting of the first lifting assembly and the second lifting assembly. Through mutual cooperation of all the parts, the platform can be lifted and lowered by the first lifting rod and the second lifting rod, so that the air brake placed on the outer side of the platform ascends and descends, and the purpose of easily disassembling and assembling the air brake is achieved.

The invention provides a slide valve device, and relates to the technical field of railway vehicle air braking. Comprising a sliding valve seat and a valve sleeve, the sliding valve seat comprises a first sealing piece and a seat body, and the first sealing piece is in sealing connection with one side of the seat body; a sliding groove is formed in the inner hole wall of the valve sleeve, a second sealing piece is arranged on the bottom face of the sliding groove in a sealed mode, the side, away from the base body, of the first sealing piece can be attached to the side face of the second sealing piece, a first valve port set is arranged on the first sealing piece, and a second valve port set corresponding to the first valve port set is arranged on the second sealing piece in a penetrating mode. A gas path group is arranged in the seat body in a penetrating manner; the first valve port group is communicated with the gas path group; the first sealing piece and the second sealing piece are made of high-strength wear-resistant materials. Due to the fact that the first sealing piece and the second sealing piece are large in hardness and excellent in abrasion resistance, foreign matter is not prone to abrading the first sealing piece and the second sealing piece, the sealing performance between the first sealing piece and the second sealing piece is guaranteed, and the service life of the sliding valve device is prolonged by more than ten times.

The utility model discloses a kind of air brake system pipeline quick sealing joint, including telescopic pipe and support pipe, the surface of telescopic pipe is equipped with buffer spring, the surface of support pipe is equipped with mounting groove, the surface of support pipe is nested with convex ring, the convex ring is made of rubber thermoplastic;It is characterized in that, it further includes locking assembly, the locking assembly is set in the both ends of telescopic pipe for quick connection fixed external pipeline;Support pipe can be nested in the inside of pipeline first, then connect pipeline with locking assembly by support pipe, and in locking assembly, the surface of threaded sleeve is equipped with locking groove in array, after pipeline is connected with butt joint groove, by rotating the locking sleeve of the surface of threaded sleeve, make threaded sleeve along locking groove produce deformation, make pipeline tightly extrude on the surface of support pipe, this design increases the contact area between pipeline and sealing joint, make pipeline stress uniform when installing, improve the sealing property of sealing joint.

An air dryer apparatus is provided for a vehicle air brake charging system. The air dryer apparatus comprises an air dryer governor assembly. The air dryer governor assembly includes a plastic sleeve having an external sleeve surface and an internal sleeve surface that defines a piston bore. The air dryer governor assembly also includes a piston disposed in the piston bore and slidable along the internal sleeve surface between a preset cut-out setting and a preset cut-in setting of the air dryer governor assembly. The air dryer governor assembly further includes one or more ribs disposed on the external sleeve surface to prevent deformation of the plastic sleeve when the piston slides along the internal sleeve surface between the preset cut-out and cut-in settings.

The application discloses a kind of automobile air brake ABS solenoid valve valve core assembly, belong to brake solenoid valve field, including the valve core of sliding setting in guide sleeve inside and the solenoid coil of being set in the outside of valve core, the end of valve core is provided with reset spring, the head end of valve core is connected with crank connecting rod driving mechanism, crank connecting rod driving mechanism includes speed reducer motor, the output shaft of being connected with speed reducer motor crank and the connecting rod of one end being hinged with crank, the other end of connecting rod passes through guide bushing and is hinged with valve core after slider, guide bushing is coaxially arranged with valve core.Using the above-mentioned automobile air brake ABS solenoid valve valve core assembly, utilizes the non-constant speed characteristic of crank slider, realizes peak linear velocity 1.2m / s in switching stage, ensures that air path switching is completed within 0.42ms.

Motor vehicle (10), with a rear air guide device (12) which is movable at least between a first position and a second position in which the rear air guide device (12) is positioned relative to the first position in the vertical direction (Z) of the motor vehicle (10) to provide an air brake function, with a first brake light (13) which, in the first position of the rear air guide device (12) in the longitudinal direction (X) or in the forward direction of travel of the motor vehicle (10), is arranged in front of and in the vertical direction (Z) of the motor vehicle (10) above the rear air guide device (12), and which, in the second position of the rear air guide device (12) in the vertical direction (Z) of the motor vehicle (10), is at least partially obscured by the rear air guide device (12), and with a second brake light (15) which is arranged,when the rear air guide device (12) is moved into the second position or from a defined intermediate position of the rear air guide device (12) between the first position and the second position, a section (12a) of the rear air guide device (12) directed towards the rear in the longitudinal direction (X) or in the forward direction of travel of the motor vehicle (10) is illuminated.

The invention provides a ship air brake welding tool, and relates to the technical field of welding treatment.The ship air brake welding tool comprises a welding table, a plasma wire feeding mechanism and a lead screw lifting mechanism, a rotary centering inner supporting mechanism is arranged above the welding table, and a supporting frame is vertically connected to the upper surface of one side of the welding table; the supporting frame is connected with a movable U-shaped seat through a lead screw lifting mechanism installed on one side, a plasma welding mechanism is arranged on one side of the movable U-shaped seat, the plasma wire feeding mechanism is fixedly installed on the upper surface of one side of the movable U-shaped seat, and an L-shaped table is fixedly installed on the upper surface of the welding table and is close to one side of the supporting frame; according to the ship air brake girth welding device, the problems that in traditional manual welding, quality fluctuation is large, deformation control is difficult, back face oxidation is serious, and efficiency is low are solved, and the process stability, product consistency and the production automation level of ship air brake girth welding are remarkably improved.

The invention relates to a train wired electric pneumatic braking system. The system is characterized in that a braking instruction is generated through a locomotive brake under the condition that a train executes an electric control air braking mode, and the braking instruction is sent to a locomotive control unit; then the locomotive control unit sends the obtained braking instruction to the vehicle control unit through a train bus; the vehicle control unit controls an electric pneumatic control valve to conduct braking processing according to the received braking instruction; a mode switching instruction for the electric control air braking mode is sent to a vehicle control unit, and then the vehicle control unit switches the electric control air braking mode into an automatic air braking mode according to the received mode switching instruction; the automatic air braking mode is used for instructing braking treatment according to the pressure reduction amount of a train pipe of the train. By the adoption of the method, the train tail safety protection function can be integrated into the train control unit and the electric pneumatic control valve of the train boxcar, and the reliability of train braking control is improved.

The utility model belongs to the technical field of vehicle braking, and particularly relates to a brake-by-wire system and a wide-body mining dump truck, which comprise an air supply unit, a multi-loop protection valve, a braking execution unit, a pair of front axle braking air chambers, a plurality of pairs of middle and rear axle braking air chambers, a front axle braking loop, a front axle air cylinder, a single-channel EBS valve and a middle and rear axle braking loop, comprising a middle-rear axle air cylinder, a multi-channel EBS valve, a service brake valve and an electromagnetic relay valve. According to the utility model, the electromagnetic relay valve is arranged, the air inlet is communicated with the middle and rear axle air reservoir, the first air outlet is communicated with the control port of the single-channel EBS valve, and the second air outlet is communicated with the control port of the multi-channel EBS valve, so that an air braking safety system and an electronic braking safety system are combined, and an automatic braking auxiliary function is realized; the braking system can actively brake when encountering sudden dangerous situations or the distance between the braking system and a front vehicle and pedestrians is smaller than the safe distance, and therefore the performance and safety of the braking system are improved.

The invention belongs to the technical field of rail transit, and particularly relates to a train braking control method and system. Comprising the steps that a train network penetrating through the whole train is established, an electric control braking channel is established, train pipes penetrating through the whole train are established, and an air braking channel is established; when the electric control brake access works normally, the electric control brake access is used as a main access, a brake instruction is synchronously transmitted to each section of vehicle through a train network, the pressure of a brake cylinder of the whole train is controlled, and brake and brake release of each section of vehicle are achieved; the air brake passage is used as a standby passage and is controlled to be in a standby state; and when the electric control brake access fails, the standby access is switched, the air brake access is controlled to work, the air distribution valve of each section of vehicle is triggered to act through the pressure change of the train pipe, and brake and brake release of each section of vehicle are achieved. According to the application, through a built'electric control main use and air standby 'dual-channel framework, the unification of high performance and high reliability of the brake control system is realized.

The present application provides a kind of tractor redundancy safety air pressure brake system, the proportional relay valve is used to when electronic brake system normal, according to the pressure correspondence of pre-stored control port and outlet, and the pressure value of actual control port, the pressure of output to ABS solenoid valve inlet is decided, so as to adjust the braking force of left and right sides, to adjust the situation of running deviation in vehicle braking process;When electronic brake system fails, the outlet of proportional relay valve is communicated with inlet, and the outlet air pressure of electronic brake system acts on ABS solenoid valve through proportional relay valve, realizes the braking of front axle, to ensure the remaining braking efficiency under the condition of electronic brake system failure, achieves redundancy brake effect, effectively improves the reliability of tractor safety brake system.

The integrated displacement sensor type brake pedal assembly comprises a brake pedal base and a brake pedal assembly arranged on the brake pedal base, a displacement sensor unit and a brake master valve are arranged on the brake pedal base, a displacement sensor is connected with a vehicle control unit through a low-voltage wire harness, a voltage value is input to the vehicle control unit, and the brake master valve is connected with the brake master valve. A whole vehicle controller converts full-stroke voltage and input voltage into brake pedal opening degree, pedal opening degree information is accurately obtained in real time, a control system can intelligently distribute mechanical braking force and electric braking force, and the energy recovery efficiency is maximized on the premise that safety is guaranteed. The mechanical braking main valve is combined with a tappet of a braking pedal, a driver steps on the braking pedal, the tappet of the braking pedal moves along with the braking pedal, a ball socket of the mechanical braking main valve is pushed to move downwards, and the mechanical braking main valve outputs gas with different pressures according to the downward moving depth of the ball socket. The mechanical braking main valve is connected with a valve body control port at the rear end of the air braking system through a nylon pipe, and after the valve body control port at the rear end of the braking system has air pressure, an axle braking air chamber begins to inflate, and vehicle braking is achieved.

The invention relates to a modularly-assembled automobile air brake plastic air storage tank. An end cylinder, a middle partition assembly, a plug end cover and a middle cylinder are flexibly assembled to form a single-cavity air storage tank, a double-cavity air storage tank or a multi-cavity air storage tank; the single-cavity air storage tank is formed by assembling an end barrel, a middle partition assembly and a plug end cover. The double-cavity air storage tank is formed by assembling end barrels on the two sides and a middle partition assembly. The multi-cavity air storage tank is formed by assembling end cylinders on the two sides, a middle cylinder and a plurality of middle partition assemblies. Sealing grooves are formed in the outer walls of the open ends of the end cylinder, the plug end cover and the middle cylinder, sealing rings are arranged in the sealing grooves, and multiple groups of end cover upper male buckles and end cover upper clamping grooves are uniformly distributed on the sides, away from the open ends, of the sealing grooves at intervals; and a plurality of groups of end cover upper female buckles and end cover upper sub-openings are uniformly distributed on one side, close to the opening end, of the sealing groove at intervals. According to the gas storage structure, the number of the cavities is flexibly configured in a modular assembly mode, connection and sealing are stable and reliable, and the gas storage structure is suitable for efficient production.

The utility model provides a kind of air brake system, including air cylinder subassembly, EPB parking brake module and brake chamber, air cylinder subassembly is connected with the air inlet of EPB parking brake module, the air outlet of EPB parking brake module is connected with brake chamber;Air brake system further includes control module and switch valve, control module is connected with switch valve, control module is used to control the opening and closing of switch valve;Switch valve is connected with the control port of EPB parking brake module;When switch valve opens, compressed gas in brake chamber can be sequentially discharged via the control port of EPB parking brake module and switch valve.The utility model further provides a kind of engineering vehicle.

The application discloses a wide-body dump truck electronic braking system and a control method, relates to the field of braking systems, and solves the technical problems that the existing wide-body dump truck air braking system has many components, a complex structure, is difficult to install and maintain, and has a complex control mode, a long debugging period, and is inconvenient to adapt to mine unmanned operation requirements. The system cancels air braking related components, adopts a pure electric braking architecture, is composed of core components such as a vehicle-mounted power supply, a mode selection switch, an electronic parking switch, an electronic foot valve and an electronic control module, is equipped with a power-off braking mode, can realize flexible switching between manual operation and unmanned automatic control, and has functions such as anti-lock, automatic obstacle braking and overspeed braking. The application has a compact structure, is convenient to install and maintain, has high braking safety and responsiveness, is suitable for modern mine automation and intelligent operation requirements, and effectively saves use and maintenance costs.

The present application relates to the technical field of driving safety, and discloses a bus driver anti-incapacitation safety regulation method, equipment and medium, which comprises the following steps: intercepting the air cylinder pressure sequence between brake release and the next brake trigger from historical brake records to generate an air cylinder pressure recovery curve corresponding to the working state of the air compressor; generating an initial deceleration demand from the driver abnormal signal and the speed curve; converting the initial deceleration demand into the brake gas volume according to the vehicle load; taking the pressure value of the current air cylinder pressure curve at the time mark of the driver abnormal signal trigger as the starting point, and extrapolating the air cylinder pressure curve after braking from the brake gas volume according to the effective volume of the air cylinder; connecting the air cylinder pressure recovery curve to generate a predicted air cylinder pressure curve; and generating a brake control request by constraining the initial deceleration demand from the predicted air cylinder pressure curve, and correcting the air cylinder pressure recovery curve; the present application is beneficial to improving the safety and reliability of the air brake bus vehicle in deceleration.

The invention relates to a compressed-air brake system for a towing vehicle, having two service brake circuits, a parking brake circuit (18) with a compressed-air reservoir (52), a reservoir line (54) leading from the compressed-air reservoir to a parking brake valve (20), and a vehicle axle brake line (56) leading from the parking brake valve to a spring-loaded brake cylinder (60a, 60b), a trailer control valve (22) with at least one direct control input (p41, p42) and a reverse control input (p43), wherein a brake control line (82, 84) is coupled to the at least one direct control input, which brake control line is coupled to a brake line (36, 46) of one of the service brake circuits, a brake control line (86) is coupled to the reverse control input, which brake control line is coupled to the brake line (56) of the parking brake circuit, and a valve device (30) for controlling the brake of a coupled trailer vehicle independently of the foot brake valve. The valve device has an electronically controllable valve unit (100), which is arranged in the brake control line coupled to the reverse control input of the trailer control valve. By means of the valve unit, the section of the brake control line on the trailer control valve side can be connected alternately to the section on the parking brake valve side or to a venting output.