3/4″ Fluid Port
Yamada® NDP-20 series AODD pumps provide a maximum flow rate of 31.7 gallons per minute. Pumps are available in aluminum, stainless steel (316), and polypropylene construction, with a wide variety of diaphragm materials.
Unified Air Valve Concept – 2 common size air valve assemblies used for 6 sizes of pumps
Reducing reassembly confusion and parts inventory
Truly No-Lubricated Air Valve – patented air valve on all NDP series pumps
Never requires lubrication or pre-packing
Non-Stalling – patented non-centering, 304SS spring-assisted shifter, ensuring a positive shift every time
Tested to last over 300 million cycles
Aides in long dead head application for reliable startup
What separates Yamada from the rest of the pack is our air valve technology. Yamada uses a completely non-lubricated main air valve and independent pilot mechanisms to control the air logic.
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.
Yamada® NDP-20 Diaphragm Pump Series
| 31.7 Gallons/Minute | |
| 3/4″ NPT Fluid Port |
Intake & Discharge Connections
| Polypropylene (PPG) |
3/4″ Female NPT or 3/4″ ANSI Flange B16.5 #150 |
| Aluminum (ADC-12) |
3/4″ Female NPT |
| Stainless Steel (316) |
3/4″ Female NPT |
| Air Inlet | 1/4″ Female NPT (includes ball valve) |
| Air Exhaust | 3/4″ Female NPT (includes silencer) |
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: Ultimate 212°F (100°C) |
| 1Polypropylene pumps have a maximum liquid temperature of 180°F (82°C) regardless of diaphragm material. |
| Air Supply Pressure (All Models) | 20 to 100 PSI (1.4 to 7 kgf/cm²) |
| Discharge Volume Per Cycle | Rubber diaphragm: 0.163 gallons (615 cc) PTFE diaphragm: 0.143 gallons (539 cc) |
| Maximum Cycles Per Minute | Rubber diaphragm: 195 PTFE diaphragm: 195 |
| Maximum Size Solid | 1/16″ (2.0 mm) |
| Maximum Dry Suction Lift | Rubber-fitted pump capability: 18-feet |
| Air Motor | Aluminum – Metal Pumps Plastice – Plastic Pumps |
| Optional Coating | PTFE-coated |
| Other Options | Split manifold pumps |
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Air Motor Kit |
K225-AM (metal center body) and K225-AP (plastic center body) |
Liquid End Kits |
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| Aluminum: | K20-MC-1, K20-MN-1, K20-ME-1, K20-MH-1, K20-MS-1, K20-MV-1, K20-MT-1, K20-MU-1 |
| Stainless Steel: | K20-MC-1, K20-MN-1, K20-ME-1, K20-MH-1, K20-MS-1, K20-MV-1, K20-MT-1, K20-MU-1 |
| Polypropylene: | K20-PC-PP, K20-PN-PP, K20-PE-PP, K20-PH-PP, K20-PS-PP, K20-PV-PP, K20-PT-PP, K20-PU-PP |
Filter / Regulators |
FR-1, FR-1A (Auto Drain) |
Dampener |
AD-25 Series |
Liquid Level Controller |
YALC & LLC-2Y |
Controllers |
YSC-3B |
Diaphragm Monitor System |
DM-2 |
DRy Run Detector |
DRD-100 |
Yamada Air Powered Double Diaphragm Pumps: Engineered for High Performance. Manufactured for Long Life.
Rugged, Bolted Construction
All Yamada pumps feature bolted construction, which eliminates leaks and simplifies post-maintenance reassembly. Bolted construction is superior to clamp band retainers, which frequently require frustrating, unnecessary leakage rebuilds from misalignment during reassembly.
Outside-Accessible Air Valve
Inspection or maintenance of every Yamada air valve may be performed without removing the pump from service. Outside accessible, making it easy to fix / inspect.
Unified Air Valve Concept
Common-size air valve assemblies reduce parts confusion and inventory.
Pilot Valve
Unique to the Yamada design is an individual modular pilot valve that actuates the air valve. It is depressed slightly by the inner center disk creating a pressure drop at one end of the air valve, allowing shifting to occur. It is maintenance free with no cumbersome snap rings or lubricated dynamic o-rings to replace or repair.
Incorporated in every Yamada Air Powered Double Diaphragm pump
Yamada air valve technology is the heart of the air-powered double diaphragm pump and determines reliability. Yamada holds three patents on its field proven valve and enjoys a superior reputation throughout the industry.
- Handles a wide variety of fluids with high solids content
- Self Priming
- Ability to Run Dry
- Variable flow rate and discharge pressure
- Portable
- Simple Installation
- Dead Head
- Shear Sensitive
- Safe Operation
- Submersible
- Pumping efficiency remains constant
- Cannot Overheat
- High Pressure capabilities
- No mechanical seals, couplings or motors
- No pressure relief or bypass needed
