- ConTROLLER CAN ConTROL THE OPERATION SPEED OF ALL KINDS AIR PRESSURE TYPE DRIVING TYPE.- BUILT IN THROTTLE VALVE AND CHECK VALVE SO IT CAN ConTROL A FIXED QUANTITY FLOW AND FINE QUANTITY OF DRIVING SPEED BY RAPID EXHAUST.- CLASSIFY INTO MANY GROUPS, SMALL FLOW ConTROLLER TO LARGE FLOW CONTROLL