... suction can reach to 4~7m. The valve ball is very round for use the ball mill machine.Three section manifold, Flexible installation ... diaphragm life. Diaphragm material from Dopont, Exxon. Pilot type air valve, low maintenance, low air consumption, so the using cost is ... pay attention to details, control the raw material, keep the ball is very round for well seal, Strengthen the pump structure ...