Front view of a black industrial double diaphragm pump with brass center.

WA Series

1 Inch WA Series Metallic Air Operated Double Diaphragm Pump

Name: 1 Inch WA Series Metallic Air Operated Double Diaphragm Pump
Brand: Nuodean
SKU: WA6661XX-XXX-C

The WA6661XX-XXX-C is a one inch metallic AODD pump in the WA Series, designed for reliable transfer of fluids that require a durable body and consistent performance. It delivers up to 35 GPM, or 133 LPM, at 120 psi, with a dry suction lift of 6.1 m and a maximum solids passage of 6.4 mm. It is available in aluminum, cast iron or 316 stainless steel, each with a bolted construction that prevents leaks and allows quick access for maintenance. The pump is built to run dry, dead head, and handle intermittent flow without damage.

Maximum flow rate	35GPM(133LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	1"BSPT or 1"NPT
Fluid outlet	1"BSPT or 1"NPT

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Key Benefits

What The One Inch Metallic Build Buys You

The WA Series is a separate platform from DP3X. It shares no features with the DP3X air end, and its performance is defined by its own design.

Compact And Light For Its Size

The aluminum version weighs just 8.6 kg, making it easy to move between stations or install on a portable cart. The cast iron and stainless steel versions are heavier but still lighter than equivalent pumps from other brands.

No Stalling At The End Of A Stroke

The air motor design ensures clean, positive shift between diaphragm cycles, so the pump does not hang at mid stroke when starting under load or during a sudden pressure change.

Easy To Service In The Field

The bolted fluid caps and accessible ball checks allow maintenance without tools or disassembly. This reduces downtime during routine checks or part replacement.

Leak Free By Design

The bolted construction seals the fluid path without O-rings or gaskets that can degrade. This reduces the risk of fluid leakage during long duty cycles.

Chemical Resistant Body Options

Choose aluminum for general duty, cast iron for abrasion resistance, or 316 stainless steel for corrosive fluids. Each body material is selected in the model code.

Matches Existing Installations

The port positions and mounting dimensions are compatible with major AODD brands, so the pump can be dropped into an existing setup without changing the piping or base.

Who It Is For

Who Buys This Pump

The 1 inch WA Series metallic pump is chosen when a plant needs a small, durable, air-driven pump for consistent transfer in a tight space or a mobile setup.

Maintenance teams transferring quenching oil, coolant or cleaning agents between small tanks and machines
Electronics manufacturers dosing solvents and cleaning fluids in small batches
Pharmaceutical and chemical labs moving reagents and formulations with minimal contamination risk
OEMs integrating a small transfer pump into a skid-mounted system or a machine
Food and beverage plants handling low viscosity liquids like syrups or condiments where hygiene is important
Facilities replacing a competitor's 1 inch AODD pump and needing a direct fit

Problems It Solves

Problems This Pump Is Bought To Fix

Most inquiries for this model come from users who have experienced one of these five issues with their current pump.

A pump that stalls at mid stroke under load, while this one shifts cleanly and starts every time
A pump that leaks at the seals, while this one uses a bolted body with no O-rings in the fluid path
A pump that cannot handle solids larger than 6.4 mm, while this one passes suspended particles up to 1/4 inch
A pump that is too heavy for one person to move, while the aluminum version weighs only 8.6 kg
A pump that fails in a corrosive fluid, while the 316 stainless steel version resists acids and alkalis

Application Scenarios

Where It Ends Up In A Plant

01

Small Tank And Drum Transfer

Self priming with 6.1 m of dry suction lift, so it can empty a drum or small tank from ground level without a foot valve.

02

System Flush And Recirculation

Can be run dry and dead headed, so it flushes lines or recirculates fluid without damage during maintenance.

03

Chemical Dosing And Blending

Air throttling allows smooth flow control from a trickle to 133 LPM, which suits small batch mixing and formulation.

04

Portable Maintenance Duty

One person carries it to a sump, connects the hose, and runs it dry without needing a second operator.

Technical Features

How The Air End Is Built

The WA Series uses a separate platform from DP3X. It does not use the DP3X air distribution system or pilot valve.

Stall Free Air Motor
The air motor design ensures the pump shifts between strokes without hanging at mid stroke, even under load or when starting from a dead stop.
Bolted Fluid Path
The fluid caps and body are bolted together, eliminating O-rings and gaskets in the fluid path, which reduces leakage and contamination risk.
Easy Access To Wear Parts
The ball check and diaphragm are accessible without removing the entire pump. This allows fast inspection and replacement during routine service.
Interchangeable Body Materials
The center body is available in aluminum, cast iron or 316 stainless steel. The model code selects the material at order time.
Selectable Wetted Parts
Diaphragm, ball check and seat materials are chosen in the model code. Options include Viton, PTFE with Santoprene, Hytrel, Santoprene, Nitrile, Neoprene, E.P.R.
Standard And Optional Connections
Fluid inlets and outlets are 1 inch BSPT or NPT. The air inlet is 1/4 inch BSPT, with 1/4 inch NPT available on request.

Specifications

Published Performance

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

Maximum flow rate	35GPM(133LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	1"BSPT or 1"NPT
Fluid outlet	1"BSPT or 1"NPT
Air inlet	1/4"BSPT(1/4"NPT available on request)
Maximum dry suction lift	20feet(6.1m)
Sound level	81.0db(A) at 70psi, 50 cycles/min.
Weight	aluminum 19 lbs(8.6kg); stainless steel 36 lbs(16.3kg); cast iron 31 lbs(14.1kg)
Model series code	WA6661XX-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
Diaphragm options	Neoprene, Nitrile, Viton, PTFE/Santoprene, E.P.R., Acetal, Hytrel, Santoprene, Nitrile
Ball check options	Neoprene, Nitrile, Viton, PTFE, E.P.R., Acetal, Polyurethane, Stainless Steel, Hytrel, Santoprene
Seat options	Aluminum, 316 Stainless Steel, Polypropylene, PVDF (Kynar), Carbon Steel, Hard 400 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 50 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, polypropylene, PVDF (Kynar), carbon steel, or hard 400 stainless steel
Ball check in neoprene, nitrile, Viton, PTFE, E.P.R., acetal, polyurethane, stainless steel, Hytrel or Santoprene
Diaphragm in neoprene, nitrile, Viton, PTFE with Santoprene backing, E.P.R., acetal, Hytrel or Santoprene
1 inch BSPT or NPT fluid connections, stainless steel or carbon steel hardware
1/4 inch NPT air inlet in place of the standard 1/4 inch BSPT, on request

Comparison

Against The Alternatives

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

Versus the 1 inch plastic WA pump	The plastic version handles acids and alkalis that attack metal, at 177.9 LPM. Choose plastic when the fluid is corrosive and the flow is the priority.
Versus the 1.5 inch WA metallic pump	The 1.5 inch reaches 340.7 LPM and lifts 6.1 m dry, but weighs 23.4 kg aluminum. Step up only when 133 LPM is not enough.
Versus the 1 inch DP3X aluminum pump	The DP3X version has a pilot valve, self-lubricating air system and anti-icing design. It is quieter and more efficient. Choose DP3X if you need lower noise or better air efficiency.
Versus the 1 inch DP3X stainless steel pump	The DP3X stainless steel version weighs 32.2 kg, has a higher flow, and includes a pilot valve. Choose DP3X for better performance and reliability.
Versus the 1 inch cast iron DP3X pump	The DP3X cast iron version has a higher solids tolerance and better abrasion resistance. Choose it for slurry duty with grit or wear particles.
Versus a small electric pump	The electric pump is quieter and more efficient at constant flow. This air pump wins when the fluid is viscous, the tank runs dry, or the area cannot have electrical equipment.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 133 LPM or half of it.

Use Full Air Supply
Flow depends on air pressure and volume. Use a 1/4 inch air line, keep it short, and confirm the compressor can hold 70 psi at the required flow.
Do Not Restrict The Suction
Throttling the suction causes cavitation and reduces diaphragm life. Only throttle the discharge or the air inlet.
Match The Elastomer To The Fluid
Choose the diaphragm and ball material based on the fluid chemistry and temperature. A wrong choice leads to rapid wear.
Keep Suction Lift Within Limits
The 6.1 m dry lift is a maximum. If the pump is above the fluid source, use a flooded suction or a foot valve to improve priming.
Stock The Repair Kit
Order the WA6661-Kit-XXX for your diaphragm and ball material. It includes the diaphragm, ball, seat, and O-rings for the fluid section.

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

1 Inch WA Series Metallic Air Operated Double Diaphragm Pump FAQ

What flow will this pump actually give me?

35 GPM, which is 133 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 one 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?

81.0 dB(A) at 70 psi and 50 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 1 inch BSPT or 1 inch NPT. The air inlet is 1/4 inch BSPT, with 1/4 inch NPT available on request.