Return time of dowty retarder

The return time is also an important technical indicator of the dowty retarder, which directly affects the effect of the dowty Retarder on the vehicle's work.

The return time not only depends on the structure of dowty retarder itself, but also the hydraulic oil and grease used by dowty retarder will become viscous, which will slow down the return speed of dowty retarder and may affect the braking work. Therefore, it is difficult to define the return time of retarders with a certain index. In order to reflect the maximum degree of freedom principle of the standard, the new standard does not make specific provisions on the return time, only stipulates that the return time of dowty retarder shall ensure that "under the difficult winter conditions, when the dowty retarder works on the normal rolling vehicle, the return time shall be less than the passing time of two wheels of the vehicle bogie".

As long as this item is satisfied, the return time will not adversely affect the braking work and other performance indicators of the dowty retarder. According to this principle, each design and production unit can specify the return time of various dowty retarder of this unit.