M51A backpressure turbine is single backpressure turbine.Its rotor uses a velocity-compounded stage impeller.Nozzle pitch diameter is 624mm.Its speed regulating system is the whole hydraulic control system,multi-valve regulations,forced lubrication.Its speed of main shaft is 6500r/min and then becomes 1500r/min through the decelerator to drag generator for electricity,or designed according to costumer requirements. /