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Altitude valve, that is, height control valve, leveling valve, etc. By dynamically sensing the height change of the vehicle, the air intake or exhaust action can be completed in time to adjust the height of the air spring (airbag), improve the comfort of the driver and passengers, and prevent the road surface from being damaged by the impact of the wheels.
In order to improve the comfort and reduce the vibration of the car body, EMUs and subway vehicles are connected to the bogie and the car body through air springs, but some new problems have been brought about.
In the actual operation process, the distribution of passengers in the compartment is uneven, and the compression of the air spring in the passenger-concentrated area is large, while the compression of the air spring in the passenger-sparse area will be relatively small, which will easily lead to the tilt of the car body.
For a train, the load capacity of each car is different, and the change of the load capacity of each car is also different at each stop, resulting in inconsistent vehicle heights, so the coupling device may be decoupled during operation. Phenomenon.
In addition, when the train passes through the curve, due to the change of gravity, the compression amount of the air spring will also be different.
In order to solve these safety problems, a suspension control device is installed between the car body and the bogie, and its core component is the height valve. When the weight of the vehicle increases, the vehicle body moves downward relative to the bogie. At this time, the height valve is fully charged to the air spring, which increases the pressure of the air spring and raises the height of the vehicle body. When the weight of the vehicle decreases, the vehicle body will move upwards. At this time, the height valve will discharge the air in the air spring, so that the pressure of the air spring will drop, and the height of the vehicle body will be lowered until the vehicle body returns to the set height.
