Introduction of double critical speed dowty retarder

As the name implies, the double critical speed Zang speedtop has two critical speeds. It is different from the previous dowty retarder in that there is only one critical speed, and it can brake the vehicles above the critical speed. Tdj-gs601 double critical speed dowty retarder has a two-stage speed valve. When the vehicle passes at a speed higher than the first critical speed and lower than the second critical speed, the dowty retarder will slow down and brake the vehicle.

When the vehicle passes through the dowty retarder at a speed higher than the second critical speed, the oil in the upper chamber of the sliding cylinder changes the flow channel and enters the lower chamber. The impact blade drives the return valve plate to rotate and cuts off the upper and lower chambers in the cylinder. The oil can only slowly return to the upper chamber from a very small orifice. The sliding cylinder picks up at a very slow speed, that is, the sliding cylinder is locked in a lower position, At this time, the roof basically does not work on the vehicle. After the vehicle passes through the roof for 10 seconds, the dowty retarder will release automatically, so as to realize no speed limit when the train departs and reverses traction.