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 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.
Options > Ultimate Diaphragms, Abrasion Pads
Literature & Drawings
- NDP-500 Brochure
- NDP-50 (PP) Flyer
- G50 Flyer (ENG)
- Product Guide (ENG)
- Product Guide (PORT)
- Engineering Handbook
- Corrosion Resistance Guide
GENERAL PUMP INFORMATION
| 2″ Fluid Port (NPT or ANSI Flange) |
| NDP-500 Series: excess of 200 Gallons/Minute | |
| NDP-50 Series: 164 Gallons/Minute | |
| G50 Series: 193 Gallons/Minute |
Intake & Discharge Connections
| Polypropylene (PPG) |
2″ ANSI Flange B16.5 #150 |
| Kynar® (PVDF) | 2″ ANSI Flange B16.5 #150 |
| Aluminum (ADC-12) | 2″ ANSI Flange B16.5 #150 (with tapped 2″ Female NPT) |
| Stainless Steel (316) | 2″ ANSI Flange B16.5 #150 or 2″ Female NPT |
| Cast Iron | 2″ Female NPT |
| Air Inlet | 3/4″ Female NPT (includes ball valve) |
| Air Exhaust | 1″ Female NPT (includes silencer) |
| *NDP-500 only available in Stainless Steel. |
Diaphragm Maximum Liquid Temperature1
| N: Buna N 180°F (82°C) |
| C: Neoprene 180°F (82°C) |
| S: Santoprene®(TPO) 180°F (82°C) |
| E: EPDM 212°F (100°C) |
| T: PTFE 212°F (100°C) |
| H: Hytrel® (TPE) 248°F (120°C) |
| V: Viton® fluoroelastomer 248°F (120°C) |
| U/W: Ultiimate 212°F (100°C) |
| *The maximum liquuid temperature for metal and Kynar® fitted pumps is determined by the elastomer (diaphragm material). Polypropylene pumps have a maximum liquid temperature of 180°F (82°C) regardless of diaphragm material. |
| Air Supply Pressure (NDP-50) | 20 to 100 PSI |
| Air Supply Pressure (G50, NDP-500) | 20 to 125 PSI |
| Discharge Volume Per Cycle | Rubber diaphragm: 1.12 gallons (4.25 liters) (NDP-50) PTFE diaphragm: 0.69 gallons (2.61 liters) (NDP-50) |
| Maximum Cycles Per Minute | Rubber diaphragm: 146 PTFE diaphragm: 220 |
| Maximum Size Solid | 5/16″ (8 mm) |
| Maximum Dry Suction Lift | Rubber-fitted pump capability: 19-feet |
| Air Motor | Aluminum – Metal or Plastic Pumps Plastic – Plastic Pumps |
| Optional Coating | PTFE-coated (NDP-50, NDP-500) |
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