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

WA Series

1 Inch WA Series Plastic Air Operated Double Diaphragm Pump

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

The WA6661XX-XXX-C is a 1 inch polypropylene air operated double diaphragm pump in the WA Series. It delivers 47 GPM, which is 177.9 LPM, at 120 psi or 8.3 bar, and can lift 4.6 m dry. The thick walled injection molded fluid casings and bolted construction prevent leaks, while the cast iron or aluminum center section resists mechanical stress. It handles fluids that attack metals, including acids, alkalis, solvents and corrosive liquids, and passes suspended solids up to 3.2 mm. The pump is lube free and stall free, so it starts under load and runs dry without damage.

Maximum flow rate	47GPM(177.9LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/8"(3.2mm)
Fluid inlet	Rp1", 1"NPT , Or 1" ANSI/DIN Flange
Fluid outlet	Rp1", 1"NPT , Or 1" ANSI/DIN Flange

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Electroplating And Surface Finishing Chemical Processing Water And Wastewater Treatment

Key Benefits

What The 1 Inch Polypropylene Build Buys You

The WA Series is a separate platform from DP3X. It is built for users who need plastic bodies with robust center sections and bolted fluid ends.

Corrosion Resistant In Acid And Alkali

The pump is suitable for waste water treatment, chemical processing, and surface preparation where the fluid is aggressive.

Leak Free With Bolted Construction

The design allows full access to ball checks and fluid caps for inspection and replacement without disassembling the entire pump.

Stall Free And Lube Free Air Motor

No oil mist is released into the air, so it is suitable for indoor or enclosed environments.

Lightweight For Portable Use

One person can carry it between tanks, sumps, and transfer points without tools or lifting aids.

No Electrical Area Classification Needed

It is safe to operate in zones where electrical equipment is restricted.

Compatible With Standard Piping

The pump fits into existing installations with minimal piping changes.

Who It Is For

Who Buys This Pump

The 1 inch polypropylene WA pump is chosen when the fluid is corrosive and the duty is not too high. It is not the choice for high flow or abrasive slurry.

Chemical plants transferring acids, alkalis, and solvents between storage tanks and process lines
Waste water treatment operators handling corrosive effluents and pH adjustment liquids
Electronics manufacturers dosing etching and cleaning fluids in production lines
Pharmaceutical and biotech labs transferring shear sensitive or sterile liquids
3D printing facilities moving resin and support material between tanks
Maintenance teams transferring quenching oil, cutting fluid, and coolant with suspended solids

Problems It Solves

Problems This Pump Is Bought To Fix

Most inquiries for this model start with a pump that failed at one of these five points.

A metal pump corrodes in acid or alkali, while the polypropylene body resists chemical attack and lasts longer.
A centrifugal pump loses prime when the tank runs low, while this pump self primes and runs dry without damage.
A pump with a welded fluid end leaks under pressure, while the bolted design of this pump prevents joint failure.
A pump with a lubricated air system produces oil mist, while this one is lube free and does not contaminate the fluid.
A heavy pump cannot be moved by one person, while the 9.2 kg weight allows single operator handling.

Application Scenarios

Where It Ends Up In A Plant

01

Chemical Transfer Between Tanks

Self priming with 4.6 m dry suction lift, so it draws fluid from a tank without a foot valve and moves it to another tank or process unit.

02

Tanker And Drum Unloading

One person carries it to a drum, connects the inlet, and empties the drum without needing a second operator or a trolley.

03

System Flush And Recirculation

The pump can be dead headed against a closed valve and restarts when the valve opens, which suits flush cycles and recirculation loops.

04

Waste Water And Filtration Feed

It feeds filter presses and dosing tanks with corrosive or abrasive liquids that would damage metal pumps.

Technical Features

How The Air End Is Built

The WA Series uses a separate platform from DP3X. The air end is designed for durability and leak prevention.

Bolted Fluid End Construction
The fluid casings are bolted together, so there are no welded joints that can crack under thermal or mechanical stress. This improves leak resistance and service life.
Cast Iron Or Aluminum Center Section
The center body is made of cast iron or aluminum, which provides mechanical strength and supports the fluid end under pressure.
Lube Free Air Distribution System
No oiler is fitted to the air inlet. The system is self lubricating and does not require maintenance or oiling.
Positive Air Valve Shift
The major air valve is shifted by a pilot signal, which ensures a fast and clean changeover between strokes. This prevents stalling at mid stroke.
Interchangeable Elastomers
The diaphragm and ball check materials are selected in the model code. Options include Viton, PTFE with Santoprene backing, Hytrel, Santoprene, nitrile, and medical grade Santoprene.
Multiple Connection Options
Fluid inlets and outlets are available in Rp1, 1 NPT, or 1 ANSI/DIN flange. 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	47GPM(177.9LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/8"(3.2mm)
Fluid inlet	Rp1", 1"NPT , Or 1" ANSI/DIN Flange
Fluid outlet	Rp1", 1"NPT , Or 1" ANSI/DIN Flange
Air inlet	1/4"BSPT(1/4"NPT Available On Request)
Maximum dry suction lift	15feet(4.6m)
Sound level	70psi 60 cycles/min. 64.5db(A)
Weight	20.3 lbs(9.2kg)
Model series code	WA6661XX-XXX-C, WA66073-2, WA637118-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

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 or cast iron
Fluid caps and manifold in polypropylene or PVDF (Kynar)
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
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 aluminum WA pump	The aluminum version at 8.6 kg is lighter and handles higher flow at 35 GPM. But it fails in acid or alkali. Choose polypropylene when the fluid is corrosive.
Versus the 1 inch metallic WA pump	The metallic pump handles higher flow and is stronger for abrasive duty. But it corrodes in acids and alkalis. Choose polypropylene for chemical resistance.
Versus the 1-1/2 inch plastic WA pump	The larger pump at 378.5 LPM gives more flow, but weighs 28.1 kg. Choose this 1 inch model when the flow requirement is under 177.9 LPM and weight matters.
Versus the 1 inch DP3X aluminum pump	The DP3X model at 651 LPM gives more flow, but it is not plastic. Choose this WA pump when the fluid is corrosive and the flow is under 177.9 LPM.
Versus the 1 inch non metallic DP3X pump	The DP3X non metallic version is not in the same series. It is built for different materials and has different performance. The WA Series is the only choice for polypropylene with bolted construction.
Versus a centrifugal pump	The centrifugal pump is cheaper to run at a fixed high flow with clean fluid. This pump wins when the tank runs dry, the line blocks, the fluid carries solids, or the area cannot take a motor.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 177.9 LPM or less.

Use Full Air Supply
Flow follows air. Use the full 1/4 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 causes cavitation and shortens diaphragm life.
Match The Elastomer To The Fluid
The diaphragm and ball material are 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 4.6 m is a dry lift figure. Priming a flooded suction is easier, so place the pump below the fluid level where possible.
Stock The Repair Kit
Order the fluid section repair kit, WA6661XX-XXX-C-Flu, coded for your diaphragm and ball material. It covers 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

1 Inch WA Series Plastic Air Operated Double Diaphragm Pump FAQ

What flow will this pump actually give me?

47 GPM, which is 177.9 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?

1/8 inch, which is 3.2 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 1 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?

64.5 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 Rp1, 1 NPT, or 1 ANSI/DIN flange. The air inlet is 1/4 inch BSPT female, with 1/4 inch NPT available on request.