What are the two components of the dowty retarder

The dowty retarder is a small independent hydraulic device that is installed at the waist of the rail and has the function of automatically reducing the rolling speed of the vehicle. The term Dowty is derived from the name of Dowty Mining Equipment Ltd (Dowty Mining Equipment Ltd) in the United Kingdom. First, it was successfully developed by P.E. Checkley, Chief Engineer of the Railway Department of Dowty Company in the United Kingdom. It was originally installed at the Tinsley and Bescot marshalling stations of the British Railway.

Dowty retarder sliding cylinder and housing are its two components. The sliding cylinder is equipped with a speed valve, which can automatically determine whether the speed of the vehicle exceeds the critical speed value; it is equipped with a pressure valve, which can absorb the kinetic energy of the vehicle. Each dowty retarder has a critical speed value. When the vehicle speed is higher than this value, the dowty retarder will act as a brake, otherwise it will not function. The Chinese-made T-DJ 302 decelerator with a critical speed of 1.25m/s, consumes 932J for each braking.