Yamada offers a range of air-operated double diaphragm (AODD) pumps designed for various applications, with the NDP-500 series leading the way in performance. The NDP-500 series boasts a maximum flow rate of 226 gallons per minute and is currently available in 316 stainless steel.
For applications requiring moderate flow rates, the NDP-50 series offers a maximum flow of 164 gallons per minute. This series provides greater material flexibility, with options including aluminum, 316 stainless steel, cast iron, Kynar® (PVDF), and polypropylene.
The G50 global series rounds out the Yamada AODD pump offerings, providing a maximum flow rate of 193 gallons per minute and is currently available in aluminum construction.
Yamada's superior air valve technology distinguishes its pumps from the competition. Utilizing a non-lubricated air valve and independent pilot mechanisms for air logic control, Yamada pumps offer reliable and efficient operation.
Here's how it works:
As compressed air enters the pump, it is directed via the main air valve to one side or the other, depending upon the starting position of the c-spool. As the air enters the chamber, it forces the diaphragm outward. This outward momentum forces liquid out of the discharge ball valve and loads the opposite inlet ball valve. As the diaphragm travels outward, the connected diaphragm on the opposite side is pulling the diaphragm inward. When it travels a full stroke, it will contact the pilot valve, depressing it and breaking the seal to open an exhaust port. The open port allows the compressed air to the exhaust from the back side of the air valve. The pressure drop produces a shift of the main air valve. This motion simply repeats on the other side.