NDP-25 Series

Yamada® NDP-25 Series Double Diaphragm Pump

Yamada Trial Pump Program

Yamada® NDP-25 series Air Powered Double Diaphragm (AODD) pumps provide a maximum flow rate of 49 gallons per minute. Pumps are available in aluminum, stainless steel (316), Kynar® (PVDF), groundable acetal, and polypropylene construction.

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.

 

GENERAL PUMP INFORMATION

46.2 Gallons/Minute
1" Fluid Port (NPT or ANSI Flange)

 

Intake & Discharge Connections
Polypropylene (PPG)
1" Female NPT or 1" ANSI Flange B16.5 #150
Kynar® (PVDF) 1" Female NPT or 1" ANSI Flange B16.5 #150
Aluminum (ADC-12) 1" Female NPT
Cast Iron 1" Female 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)
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)
*Polypropylene and acetal pumps have a maximum liquid temperature of 180°F (82°C) regardless of diaphragm material. Kynar® pumps have a maximum temperature of 248°F (120°C) when fitted with Hytrel® or Viton® diaphragms.

 

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

Rubber diaphragm: 0.23 gallons (862 cc)
PTFE diaphragm: 0.17 gallons (654 cc)

Maximum Cycles Per Minute

Rubber diaphragm: 210
PTFE diaphragm: 210

Maximum Size Solid 3/16" (4.8 mm)
Maximum Dry Suction Lift Rubber-fitted pump capability: 18-feet
Air Motor Standard: Aluminum
Optional Coating PTFE-coated

MATERIAL TYPES

:: Aluminum
Dimensions: 11.30" W x 15.08" H
Net Weight: 27 lbs. (13.0 kg)
Shipping Weight: 31 lbs.
:: Polypropylene (ANSI flange)
Dimensions: 14.40" W x 17.40" H
Net Weight: 29 lbs. (10.9 kg)
Shipping Weight: 30 lbs.
:: Polypropylene (NPT)
Dimensions: 14.40" W x 16.90" H
Net Weight: 29 lbs. (10.9 kg)
Shipping Weight: 30 lbs.
:: Kynar® (PVDF) (ANSI flange)
Dimensions: 14.40" W x 17.40" H
Net Weight: 29.7 lbs. (13.4 kg)
Shipping Weight: 33 lbs.
:: Kynar® (PVDF) (NPT)
Dimensions: 14.40" W x 16.90" H
Net Weight: 29.7 lbs. (13.4 kg)
Shipping Weight: 33 lbs.
:: Cast Iron
Dimensions: 11.30" W x 15.08" H
Net Weight: 43 lbs. (19.9 kg)
Shipping Weight: 46 lbs.
:: Stainless Steel
Dimensions: 11.30" W x 15.08" H
Net Weight: 43 lbs. (19.9 kg)
Shipping Weight: 46 lbs.

ACCESSORIES

Air Motor Kit

K225-AM (metal center body) and K225-AP (plastic center body)

Liquid End Kits
  Aluminum: K25-MC-1, K25-MN-1, K25-ME-1, K25-MH-1, K25-MS-1, K25-MV-1, K25-MT-1
  Stainless Steel: K25-MC-1, K25-MN-1, K25-ME-1, K25-MH-1, K25-MS-1, K25-MV-1, K25-MT-1
  Cast Iron: K25-MC-1, K25-MN-1, K25-ME-1, K25-MH-1, K25-MS-1, K25-MV-1, K25-MT-1
  Polypropylene: K25-PC-PP, K25-PN-PP, K25-PE-PP, K25-PH-PP, K25-PS-PP, K25-PV-PP, K25-PT-PP
  Kynar: K25-VE-PP, K25-VH-PP, K25-VS-PP, K25-VV-PP, K25-VT-PP
Filter / Regulators

FR-3, FR-3A (Auto Drain)

Dampener

AD-25 Series

Liquid Level Controller

LLC-2Y, LLC-1 and LLC-4

Controllers

YSC-3EX and YSC-Batch

Diaphragm Monitor System

DM-2

DRy Run Detector

DRD-100

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

Insepction or maintenance of every Yamada air valve may be perfomred 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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