About the seal life of the dowty retarder for 1 maintenance cycle

The original standard stipulates that “the sealing life of a maintenance cycle shall not be less than 100,000 rounds or 3 months”. Article 5.1.17 of the new standard stipulates: the sealing life of a maintenance cycle of dowty retarder under normal use conditions No less than 150,000 rounds or 6 months, whichever comes first. "At first, it is emphasized that the premise for the dowty retarder to reach the sealing life index must be under the "normal use conditions". At the same time, according to the current hydraulic sealing technology level and the actual use of the dowty retarder in the field, the new standard improves this index. This index is also the lowest one. Each design and production unit can specify higher sealing life index in relevant technical documents according to the characteristics of their own products.

In the standard, two indexes of rolling times and service time of dowty retarder are given. This is because the service conditions on site are very different, so it is unscientific to use only one index. In fact, the rolling times of vehicles passing through the dowty retarder are not synchronized with the service time of retarders. When the rolling times of busy stations reach 150000 rounds, it usually takes less than 6 months, while the rolling times of stations with small workload are less than 150000. Therefore, the two indicators should be based on the first come.