... machinery, mine machinery, ship machinery, petroleum equipments, engineering and machine tool control.2.Pumping rate: 40, 71,125,180, 250, 300 ... disc 4. Excellent sucking characteristic 5.Sensitive response control 6.The special designed long life and the high ... DR/DRG constant pressure control, LR hyperbola constant power auto-control, and EO2 electrical proportional control. 11.Rated working pressure ...