NDP-32 Series

Yamada® NDP-32 Series Double Diaphragm Pump

Yamada Trial Pump Program

1-1/2" Intake Fluid Port

1-1/4" Discharge Fluid Port


Simplify Your Pump Replacement With a Yamada!

Have you ever wanted to switch out your old pump for a Yamada®, but faced re-piping issues? With the NDP-32 Pump from Yamada, your problems are solved. This 1-1/2” inlet port x 1-1/4” outlet port matches up dimensionally with old competing brand’s designs. Now your conversion to Yamada is just a little bit easier.

Yamada® NDP-32 series AODD pumps provide a maximum flow rate of 50.2 gallons per minute. Pumps are available in aluminum construction.

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.



50.2 Gallons/Minute
1-1/2" Fluid Intake Port(NPT)


Intake & Discharge Connections
Aluminum (PPG)
1-1/2" Fluid Intake Port, 1-1/4" Fluid Discharge Port (NPT)

Air Inlet

3/8" Female NPT (includes ball valve)

Air Exhaust

3/4" Female NPT (includes silencer)


Maximum Liquid Temperature1
Buna N 180°F (82°C)
Santoprene®(TPO) 180°F (82°C)
PTFE 212°F (100°C)
*The maximum liquid temperature for metal pumps is determined by the elastomer (diaphragm material).



Air Supply Pressure (All Models) 20 to 100 PSI (1.4 to 7 kgf/cm²)
Discharge Volume Per Cycle

Rubber diaphragm: 0.176 gallons

PTFE diaphragm: 0.147 gallons

Maximum Cycles Per Minute

Rubber diaphragm: 285

PTFE diaphragm: 296

Maximum Size Solid 1/8" (3 mm)
Air Motor Standard: Aluminum


Model # Description
854575 NDP-32BAN
854575-TPO NDP-32BAS
854576 NDP-32BAT


:: Aluminum
Dimensions: 11.18" W x 16.87" H
Net Weight: 26.5 lbs. (12.0 kg)
Shipping Weight: 31.5 lbs.


Air Motor Kit


Liquid End Kits

Aluminum: K32-MN, K32-MT

Filter / Regulators

FR-3 and FR-3A (Auto Drain)


AD-25 Series

Liquid Level Controller




Diaphragm Monitor System


DRy Run Detector


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.

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.

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
  • Cannot Overheat
  • High Pressure capabilities
  • No mechanical seals, couplings or motors
  • No pressure relief or bypass needed

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