The function of the levelling valve is to maintain the car body on a set level, in order to safeguard a safe embarking or disembarking of passengers at the station and to increase the driving comfort by an optimum setting of the air suspension.
What is levelling? Levelling in surveying is the process of determining the height of one level relative to another. It is used to establish the elevation of a point relative to a datum, or to establish a point at a given elevation relative to a datum
The height control valve maintains a constant ride height by automatically adding air to or exhausting air from the air suspension system. Hendrickson air suspensions only require one height control valve per trailer, regardless of the number of trailer axles.
