NDP-15 Series

Yamada® NDP-15 Diaphragm Pump Series

Yamada® NDP-15 series Air Powered Double Diaphragm (AODD) pumps provide a maximum flow rate of 13.5 gallons per minute. Pumps are available in aluminum, stainless steel (316), Kynar® (PVDF), groundable acetal, and polypropylene construction, with a wide variety of diaphragm materials.


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.




13.5 Gallons/Minute
1/2" NPT Fluid Port


Intake & Discharge Connections
Polypropylene (PPG)1 1/2" Female NPT
Kynar® (PVDF)2 1/2" Female NPT
Groundable Acetal2 1/2" Female NPT
Aluminum (ADC-12)3 1/2" Female NPT
Stainless Steel (316)3 1/2" Female NPT
Air Inlet 1/4" Female NPT (includes ball valve)
Air Exhaust 3/8" Female NPT (includes silencer)
1Polypropylene pumps may be fitted with ball or flat check valves. Ball-type check valves are recommended for flooded suction applications. Flat-type check valves are recommended for suction lift applications.
2Kynar® and Groundable Acetal pumps are fitted with flat check valves only.
3Aluminum and Stainless Steel pumps are fitted with ball check valves only.


Maximum Liquid Temperature1
Buna N 180°F (82°C)
Neoprene 180°F (82°C)
Santoprene®(TPO) 180°F (82°C)
EPDM 212°F (100°C)
PTFE 212°F (100°C)
Hytrel® (TPE) 248°F (120°C)
Viton® fluoroelastomer 248°F (120°C)
1Polypropylene and acetal 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 0.034 gallons (128 cc)
Maximum Cycles Per Minute 400
Maximum Size Solid 1/32" (1mm)
Maximum Dry Suction Lift Flat-type check valve: 8-feet
Ball-type check valve: 5-feet
Air Motor Ryton® air motor standard
Other Options Split manifold pumps


:: Aluminum
Dimensions: 8.66" W x 10.71" H
Net Weight: 9 lbs. (4 kg)
Shipping Weight: 11 lbs.
:: Kynar® (PVDF)
Dimensions: 8.66" W x 11.73" H
Net Weight: 9.4 lbs. (4.2 kg)
Shipping Weight: 11 lbs.
:: Groundable Acetal
Dimensions: 8.66" W x 11.73" H
Net Weight: 9 lbs. (4 kg)
Shipping Weight: 11 lbs.
:: Polypropylene (NPT)
Dimensions: 8.66" W x 11.73" H
Net Weight: 7.7 lbs. (3.5 kg)
Shipping Weight: 9.5 lbs.
:: Polypropylene (Center Port)
Dimensions: 8.66" W x 11.73" H
Net Weight: 7.7 lbs. (3.5 kg)
Shipping Weight: 9.5 lbs.
:: Stainless Steel
Dimensions: 8.31" W x 9.7" H
Net Weight: 13.6 lbs. (6.16 kg)
Shipping Weight: 15.5 lbs.

The Yamada Advantage

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.

Patented Air Valve Technology

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.

Why Specify an AODD Pump?

  • 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

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