Influence of pressure valve performance on dowty retarder function

The damage of many parts in the dowty retarder is closely related to the internal pressure when the dowty retarder works, especially the damage of the sealing cover. Through fault tree analysis, we have learned that whether the seal cover works normally or not is the key to whether the dowty retarder works normally.

In fact, the failure rate of the dowty retarder can not be separated because of the frequent damage of the sealing cover. According to the failure phenomenon, it is the screw thread of the sealing cover and the whole ring falling off, and from the cause analysis, it is probably due to the constant impact of the train wheel and the excessive internal pressure when the dowty retarder works. The reason for the excessive pressure is closely related to the dynamic performance of the pressure valve. Because the pressure valve core oscillates during the working process, the outlet of the valve will be large or small, so it is possible to close the pressure valve instantaneously, and the liquid nitrogen mixture inside the valve will be continuously compressed, so that the pressure.