Black industrial double diaphragm pump with green seals and metal fittings on a white background

WA Series

2 Inch WA Series Plastic Air Operated Double Diaphragm Pump

The WA6662A3 is a two inch plastic AODD pump in the WA Series, built for handling aggressive fluids where metal would corrode. It moves up to 145 GPM, which is 548.8 LPM, at 120 psi or 8.3 bar, lifts 4.27 m dry, and passes suspended solids to 6.4 mm. The thick-walled polypropylene fluid casings resist acids, alkalis, and solvents, while the aluminum or cast iron center body adds structural strength. It runs dry and dead heads without damage, and the bolted construction ensures leak-free fluid handling.

Maximum flow rate	145GPM(548.8LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	2" ANSI/DIN Flange
Fluid outlet	2" ANSI/DIN Flange

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Electroplating And Surface Finishing Chemical Processing Water And Wastewater Treatment

Key Benefits

What The 2 Inch Plastic Build Buys You

The WA Series plastic pump trades flow and weight for chemical resistance and cost in a way the metallic versions do not.

Handles Acids And Alkalis Without Degrading

The pump does not need a coating or liner, so there is no risk of delamination or flaking over time.

Lighter Than Metallic Versions

This makes it easier to move between stations, especially in maintenance or cleaning duties.

No Corrosion, No Rust, No Maintenance Cost

It requires no protective coatings or sacrificial anodes, reducing long-term ownership cost.

Bolted Construction For Leak-Free Handling

This design prevents leaks and makes the pump suitable for containment-critical or hygiene-sensitive applications.

Easy Access For Maintenance

This reduces downtime during repairs and allows quick replacement of wear parts.

Compatible With Standard Flanges

This reduces installation time and avoids the need for custom spools.

Who It Is For

Who Buys This Pump

The 2 inch plastic pump is chosen when the fluid is chemically aggressive and the plant needs a durable, low-maintenance transfer solution.

Chemical plants transferring acids, alkalis, and solvents between storage and process tanks
Pharmaceutical and biotech labs handling reagents and process liquids that must not be contaminated by metal
Electronics manufacturers using etching and cleaning fluids that attack metal pumps
Waste treatment facilities handling corrosive effluent from industrial processes
Food and beverage plants using acidic or alkaline cleaning agents in CIP systems
Maintenance teams replacing a metal pump that failed due to corrosion

Problems It Solves

Problems This Pump Is Bought To Fix

Every enquiry for this model starts with a pump that failed at one of these five things.

A metal pump corroded in a caustic solution, while this polypropylene pump resists the same fluid without degradation
A pump failed due to rust in a wet environment, and this pump has no metal parts exposed to moisture
A pump leaked at a welded joint under thermal cycling, and this bolted design avoids that failure mode
A plant lost time replacing a pump every few months due to chemical attack, and this pump lasts longer in the same service
A pump required frequent coating repairs, and this pump needs none

Application Scenarios

Where It Ends Up In A Plant

01

Chemical Transfer Between Tanks

The pump handles aggressive fluids with no risk of contamination or corrosion, and the 4.27 m dry lift allows it to draw from low tanks.

02

CIP System Fluid Circulation

It circulates cleaning solutions through a system without introducing metal ions, and runs dry safely during rinse cycles.

03

Waste Stream Transfer

It moves corrosive waste from a sump to a holding tank without degrading, and can be dead headed during valve closure.

04

Laboratory And Pilot Plant Use

The pump handles small batches of reactive chemicals with no risk of metal leaching, and the bolted design allows inspection.

Technical Features

How The Air End Is Built

The WA Series uses a separate platform from DP3X, with its own air distribution system and mechanical design.

Pilot Air Valve With Mechanical Shift
The major air valve is shifted by a mechanical pin and pneumatically by compressed air, which ensures a fast, positive changeover.
Dual Ceramic Dynamic Seals
Both the major and pilot air valves use ceramic dynamic seals, which resist wear and tolerate dirty air supplies.
Self Lubricating Lube Free Air System
No oiler is fitted to the air inlet. The system runs without lubrication, so there is no oil mist in the exhaust.
Anti Icing Vacuum Chamber
The built in vacuum chamber reduces discharge air pressure, which lowers the cooling effect and reduces exhaust noise.
Interchangeable Installation Envelope
Port positions and flange spacing match standard ANSI/DIN 2 inch flanges, so it fits into existing pipework.
Selectable Wetted Materials
The model code allows selection of diaphragm, ball check, seat, and fluid cap materials to match the fluid chemistry.

Specifications

Published Performance

Transcribed from the performance table Nuodean publishes for this model in the series catalogue.

Maximum flow rate	145GPM(548.8LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	2" ANSI/DIN Flange
Fluid outlet	2" ANSI/DIN Flange
Air inlet	1/2"BSPT(1/2"NPT available on request)
Maximum dry suction lift	14feet(4.27m)
Sound level	77.7db(A) at 70psi, 60 cycles/min.
Weight	62 lbs(28.1kg)
Service Repair Kits	WA637118-C (air section); WA637165-XX-C (fluid section)
Model series code	WA6662A3-XXX-C

Materials

Material Options

Set in the model code. Ask us if you need a combination the code allows but the sheet does not show.

Wetted body material	Polypropylene
Diaphragm options	Neoprene, Nitrile, Viton, PTFE/Santoprene, E.P.R., Composite PTFE, Hytrel, Santoprene
Ball check options	Neoprene, Nitrile, Polypropylene, PTFE, E.P.R., Polyurethane, Hytrel, Santoprene
Seat options	316 Stainless Steel, Polypropylene, PVDF (Kynar), Hard 400 Stainless Steel
Center Body Mat	A-Aluminum, B-Cast Iron
Fluid Caps Manifold Mat	3-Polypropylene flange (3-piece manifold), 4-PVDF (Kynar)

Performance figures are transcribed from the Nuodean data sheet for this pump. Flow is measured at the pump discharge with water at ambient temperature; your duty point depends on air supply pressure, suction conditions, fluid viscosity and discharge head. Ask our engineers to confirm the duty point before you order.

Quality Control

Before It Is Crated

Every pump is run on air before shipment to verify shift behaviour
Sound level is published at 70 psi and 60 cycles per minute for verification
Wetted materials are checked against the ordered model code at assembly
The pump ships with the data sheet and both the fluid and air section part lists

Customization

What You Can Change

Center body in aluminum (A) or cast iron (B)
Fluid caps and manifold in polypropylene (3) or PVDF (Kynar) (4)
Seat in 316 stainless steel, polypropylene, PVDF (Kynar), or hard 400 stainless steel
Ball check in neoprene, nitrile, polypropylene, PTFE, E.P.R., polyurethane, Hytrel, or Santoprene
Diaphragm in neoprene, nitrile, Viton, PTFE with Santoprene backing, E.P.R., composite PTFE, Hytrel, or Santoprene
Air inlet in 1/2 inch BSPT or 1/2 inch NPT (on request)
Fluid connections in 2 inch ANSI/DIN flange

Comparison

Against The Alternatives

Where this pump wins and where you should be buying something else.

Versus the 2 inch aluminum version	The aluminum pump gives 172 GPM and weighs 29.6 kg, but it cannot handle strong acids or alkalis. Choose the plastic pump when the fluid chemistry attacks metal.
Versus the 2 inch stainless steel version	The stainless pump handles abrasives and high pressure better, but the plastic version resists corrosion from acids and solvents that destroy stainless steel.
Versus the 2 inch polypropylene pump in the DP3X series	The DP3X plastic pump is not available in 2 inch. The WA Series is the only plastic option in this size for this platform.
Versus the 1-1/2 inch WA plastic pump	The 1-1/2 inch model gives 100 GPM, which is less than half the flow. Step up to 2 inch only when 548.8 LPM is needed.
Versus the 2 inch non-metallic pump in the DP3X series	The DP3X plastic pump is not available in 2 inch. The WA Series is the only plastic option in this size for this platform.
Versus the 2 inch cast iron pump	The cast iron pump is heavier and more expensive, but it handles abrasive slurries better. Choose plastic when the fluid is corrosive, not abrasive.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 548.8 LPM or half of it.

Use Full Air Supply
Flow depends on air pressure and volume. Use a 1/2 inch air line, keep the hose short, and confirm the compressor can hold 70 psi at the required flow.
Do Not Throttle The Suction
Throttling the suction causes cavitation, which damages diaphragms and reduces flow. Use the full 2 inch flange inlet.
Match The Elastomer To The Fluid
The diaphragm and ball check materials must resist the fluid. PTFE with Santoprene backing for acids, Viton for hot oils, Santoprene for general use.
Keep Suction Lift Within Limits
The 4.27 m dry lift is the maximum. Priming from a flooded suction is easier and more reliable, so position the pump below the fluid source when possible.
Stock The Repair Kits
Order the air section kit WA637118-C and the fluid section kit WA637165-XX-C, coded for your diaphragm and ball material. These cover the most common wear parts.

Documents

Documents For This Pump

Straight from Nuodean's own literature: series catalogues.

PDF WA Diaphragm Pump Catalogue Series Catalogues PDF 4.0 MB Download

Need a 2D or 3D CAD model of this pump? CAD on request via WhatsApp.

Answers

2 Inch WA Series Plastic Air Operated Double Diaphragm Pump FAQ

What flow will this pump actually give me?

145 GPM, which is 548.8 LPM, is the maximum with a free discharge and full air supply. Real duty points are lower. Send us the discharge head and the air pressure you can hold and we will tell you where on the curve you land.

Can it run dry?

Yes. An air operated double diaphragm pump can be run dry and can be dead headed against a closed valve without damage. That is the main reason plants choose one over a centrifugal pump.

What is the largest solid it will pass?

1/4 inch, which is 6.4 mm, on the suspended solids figure from the data sheet. If your fluid carries bigger solids, look at the 3 inch models at 9.5 mm or the heavy duty flap valve pump at 50 mm.

Will it replace another brand of two inch AODD pump?

Usually yes. The WA Series pumps are built so that installation dimensions and footprint are compatible with other brands. Send a photo of the nameplate and the pipework and we will confirm before you buy.

Which diaphragm should I order?

PTFE with a Santoprene backing for aggressive solvents and acids, Santoprene for general duty and long flex life, Viton for hot oils and aromatics, nitrile for petroleum products. Tell us the fluid and the temperature and we will put the right code on the quotation.

How loud is it?

77.7 dB(A) at 70 psi and 60 cycles per minute, as printed on the data sheet. Slower cycling is quieter, and a piped exhaust takes more off.

What connections does it come with?

Fluid inlet and outlet are 2 inch ANSI/DIN flanges. The air inlet is 1/2 inch BSPT female, with 1/2 inch NPT available on request.