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

WA Series

2 Inch WA Series Metallic Air Operated Double Diaphragm Pump

The 2 inch WA Series metallic AODD pump delivers 172 GPM, or 651 LPM, at up to 120 psi or 8.3 bar. It lifts 8.3 m dry and passes solids up to 6.4 mm. The pump is available in aluminum, cast iron or 316 stainless steel, so the body matches the fluid chemistry. The air motor is stall free and lube free, so it starts under load and needs no oiler. The compact, bolted construction keeps the fluid path leak free and allows quick access to the ball checks and fluid caps.

Maximum flow rate	172GPM(651LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	2"BSPT Or 2"NPT
Fluid outlet	2"BSPT Or 2"NPT

Request A Quote [email protected]?subject=Inquiry%3A%202%20Inch%20WA%20Series%20Metallic%20Air%20Operated%20Double%20Diaphragm%20Pump

Metalworking And Machine Tools Chemical Processing Water And Wastewater Treatment

Key Benefits

What The 2 Inch WA Series Build Buys You

The WA Series is a separate platform from DP3X. It shares performance but not design. This pump is built for material choice, not for the latest air end innovation.

Choose The Body Material For The Fluid

Aluminum is light and good for non-corrosive liquids. Cast iron handles abrasion and is heavier. Stainless steel resists corrosion and is used in chemical and pharmaceutical service. The body material is selected in the model code, not fixed at the factory.

Runs Dry Without Damage

The pump can be run dry or dead headed against a closed valve. No priming is needed, and no damage occurs to the diaphragms or valves. This is the main reason plants use AODD over centrifugal pumps.

No Air Line Lubricator Needed

The air end is self lubricating and lube free. No oiler is fitted, so there is no oil mist in the exhaust and no maintenance task to check the oil level.

Easy Access For Maintenance

The fluid caps and ball checks are accessible from the top. The bolted construction allows quick disassembly without tools, so repairs take less time than on a welded pump.

Leak Free Fluid Path

The fluid path is sealed with bolts, not welds. This design prevents stress cracking and allows the pump to handle shear sensitive materials without degradation.

Matches Other Brand Footprint

Port positions, foot spacing and overall envelope are compatible with major AODD brands. The base, pipe spools and air line usually stay the same when replacing a competitor pump.

Who It Is For

Who Buys This Pump

The 2 inch WA Series is chosen when the plant needs a metallic pump with a proven body material choice, but does not require the latest air end design.

Chemical plants transferring solvents, acids and alkalis between tanks and process lines
Machine shops moving cutting fluid, quenching oil and coolant with metal chips
Pharmaceutical and food processing plants handling shear sensitive liquids and requiring stainless steel
Contractors who need a portable pump for sump and pit emptying
OEMs building skid mounted transfer systems for industrial equipment
Plants replacing a competitor 2 inch AODD pump and keeping the same pipework

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 points.

A centrifugal pump loses prime when the tank runs low, while this pump self primes and can be run dry without damage
Line blockages stop a centrifugal pump and cause cavitation, while this AODD simply stops and restarts when the blockage clears
Abrasive fluids wear out close clearance pumps, but the ball check passes solids to 6.4 mm and the body materials are selectable
Electric pumps bring area classification issues in solvent areas, and air drive avoids that requirement
A pump that is too heavy to move by two people cannot be used for portable transfer, but the aluminum version at 29.6 kg can

Application Scenarios

Where It Ends Up In A Plant

01

Tanker And Drum Unloading

Self priming with 8.3 m of dry suction lift, so it empties a road tanker or a drum bank from ground level without a foot valve.

02

Batching And Blending Transfer

Air throttling gives smooth flow control from a trickle to 651 LPM without a variable speed drive, which suits recipe dosing into a mixer.

03

Filter Press And Filtration Feed

The pump can be dead headed as the cake builds and the pressure rises, then restart when the press is stripped.

04

Sump And Pit Emptying

One person carries it to the pit, drops the suction hose in and runs it dry at the end without burning anything out.

Technical Features

How The Air End Is Built

The WA Series uses a different air end platform than DP3X. It is not the same as the current generation design.

Stall Free Air Motor
The air distribution system is designed to shift the major valve cleanly and fully, so the pump does not stall at mid stroke under load.
Self Lubricating Lube Free System
No lubricator is fitted to the air inlet. The system runs on compressed air alone, so there is no oil mist and no maintenance task.
Bolted Fluid Path
The fluid caps and center body are bolted together. This design avoids welds, reduces stress, and allows quick access for maintenance.
Interchangeable Installation Envelope
Port positions, foot spacing and overall envelope follow the major brands, so this pump can be dropped into an existing installation.
Selectable Wetted Materials
The center body, fluid caps and manifold are each chosen in the model code. The diaphragm and ball check materials are also selected in the code.
No Built In Vacuum Chamber
The WA Series does not have a vacuum chamber to reduce discharge air pressure. The sound level is higher than on the DP3X series.

Specifications

Published Performance

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

Maximum flow rate	172GPM(651LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	2"BSPT Or 2"NPT
Fluid outlet	2"BSPT Or 2"NPT
Air inlet	3/4"BSPT(3/4"NPT Available On Request)
Maximum dry suction lift	27.2feet(8.3m)
Sound level	70psi 60 cycles/min. 85.3db(A)
Weight	65.2 lbs(29.6kg); 129.9 lbs(58.9kg); 124.3 lbs(56.38kg)
Model series code	WA66625X-XXX-C, WA66627X-XXX-C, WA6662X0-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	Aluminum, cast iron or 316 stainless steel

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 it leaves, so the shift behaviour is checked rather than assumed
Sound level is published for the model at 70 psi and 60 cycles per minute so you can hold us to it
Ball, seat and diaphragm materials are checked against the ordered model code at assembly
The pump ships with the data sheet and both the fluid section and air section part lists

Customization

What You Can Change

Center body in aluminum, cast iron or 316 stainless steel
Fluid caps and manifold in aluminum, 316 stainless steel or cast iron
Seat in aluminum, 316 stainless steel, PVDF, carbon steel, hard stainless steel, Santoprene, Hytrel or nitrile
Ball check in neoprene, nitrile, Viton, PTFE, EPDM, acetal, polyurethane, stainless steel, Hytrel or Santoprene
Diaphragm in neoprene, nitrile, Viton, PTFE with Santoprene backing, EPDM, acetal, Hytrel or Santoprene
NPT or BSP threaded fluid connections, stainless steel or carbon steel hardware
3/4 inch NPT air inlet in place of the standard 3/4 inch BSPT, on request

Comparison

Against The Alternatives

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

Versus the 2 inch aluminum DP3X pump	Same 651 LPM and same 8.3 bar, but the WA Series is heavier at 29.6 kg and has a different air end. Choose DP3X for the latest air end design and lower sound level.
Versus the 2 inch cast iron DP3X pump	The DP3X cast iron version at 56.4 kg is lighter than the WA Series cast iron at 58.9 kg. Choose DP3X if weight and portability matter more than body material choice.
Versus the 2 inch plastic WA pump	The plastic WA pump handles acids and alkalis that attack aluminum, at a lower 548.8 LPM. Choose plastic when the fluid is corrosive and the flow is not the main concern.
Versus the 2 inch stainless steel WA pump	The stainless steel version is the choice for chemical and pharmaceutical service. The aluminum version is for non-corrosive fluids and portability.
Versus the 3 inch WA metallic pump	The 3 inch reaches 897 LPM and passes 9.5 mm solids, but weighs 49.8 kg (aluminum). Step up only when 651 LPM is genuinely not enough.
Versus the 2 inch non metallic AODD pump	The non metallic pump handles aggressive chemicals that eat metal, but at a lower flow. Choose non metallic on chemistry, not on flow.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 651 LPM or half of it.

Give It Real Air
Flow follows air. Use the full 3/4 inch inlet, keep the hose short and confirm the compressor can hold pressure at the flow the pump asks for.
Do Not Throttle The Suction
Throttle the discharge or the air, never the suction. Starving the suction is what causes cavitation, hard running and short diaphragm life.
Match The Elastomer To The Fluid
Diaphragm and ball material is chosen in the model code. Get the chemistry right and the pump lasts. Get it wrong and nothing else you do will save it.
Keep Suction Lift Honest
The published 8.3 m is a dry lift figure on the data sheet. Priming a flooded suction is always easier, so put the pump below the tank where the layout allows.
Stock The Two Repair Kits
One air section kit, WA66625X-Air, and one fluid section kit, WA66625X-Flu, coded for your diaphragm and ball material. Between them they cover almost every wear part.

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 Metallic Air Operated Double Diaphragm Pump FAQ

What flow will this pump actually give me?

172 GPM, which is 651 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?

85.3 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 BSPT or 2 inch NPT. The air inlet is 3/4 inch BSPT female, with 3/4 inch NPT available on request.