... mine machinery, ship machinery, petroleum equipments, engineering and machine tool control.2.Pumping rate: 40, 71,125,180, 250, 300 ... bevel disc 4. Excellent sucking characteristic 5.Sensitive response control 6.The special designed long life and the high ... bevel disc angle.10.Complete control mode, including DR/DRG constant pressure control, LR hyperbola constant power auto-control, and EO2 electrical ...