Front view of a gray industrial double diaphragm pump with flanged ports and a black center block.

DP3X Series

1 Inch Non Metallic Air Operated Double Diaphragm Pump

This Nuodean DP31-15 one inch non metallic pump moves corrosive fluids without metal contamination and without the weight of metal construction. It delivers up to 47 GPM, which is 177.9 LPM, at up to 120 psi or 8.3 bar, passes suspended solids to 3.2 mm, and lifts 4.6 m dry. The polypropylene and PVDF construction keeps it to 9.2 kg, so one person can move it easily, and the stall free air motor means it starts under load every time.

Maximum flow rate	47GPM(177.9LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/8"(3.2mm)
Fluid inlet	BSP 1", 1"NPT , Or 1" ANSI/DIN Flange
Fluid outlet	BSP1", 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 Non Metallic Build Gives You

Light weight and chemical resistance are the main benefits, but there are others.

The Lightest One Inch In The Range

At 9.2 kg it is lighter than the aluminum pump at 8.6 kg, the stainless steel pump at 16.3 kg and the cast iron pump at 14.1 kg. That matters for portable duty and for mounting on skids.

177.9 LPM Without An Electric Motor

All the pump needs is a compressed air line. No motor, no starter, no VFD, no earthing and no electrical area classification paperwork.

It Will Not Stall At The End Of A Stroke

A pilot air valve gives the major air valve a positive, fast shift signal. The pump trips over cleanly instead of sitting at mid stroke waiting for someone to tap the air end.

No Oiler On The Air Line

The air distribution system is self lubricating and lube free, so there is no oil mist in the exhaust and nothing to top up on a maintenance round.

Resistant To A Wide Range Of Chemicals

Polypropylene and PVDF are resistant to most acids, alkalis, solvents and corrosive fluids. Check the fluid compatibility chart before use.

It Fits Where Your Old Pump Sits

Installation dimensions and footprint are compatible with the major AODD brands, so the base, the pipe spools and the air line usually stay exactly as they are.

Who It Is For

Who Buys This Pump

One inch non metallic is the first choice when the fluid attacks metal or when contamination must be avoided.

Chemical plants transferring acids, alkalis, solvents and corrosive chemicals
Electroplating shops pumping plating solutions and rinse water
Water treatment plants dosing chemicals and emptying sumps
Food and beverage processors transferring food acids and cleaning fluids
Pharmaceutical manufacturers handling sensitive liquids
Laboratories and research facilities pumping laboratory waste

Problems It Solves

Problems This Pump Is Bought To Fix

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

A metal pump corroded and contaminated the process fluid
A centrifugal pump could not handle the fluid's viscosity or solids content
An electric pump created a safety hazard in a flammable environment
A pump stalled repeatedly, interrupting the process
A pump was too heavy to move easily between tasks

Application Scenarios

Where It Ends Up In A Plant

01

Chemical Dosing

Air throttling gives precise flow control for addition of chemicals to a process, with no need for a VFD.

02

Laboratory Waste Transfer

Handles a wide range of laboratory waste, including corrosive chemicals and solvents, without risk of contamination.

03

Small Tank Unloading

Self priming and dry run capability make it ideal for emptying small tanks and drums.

04

Filter Feed

Can be dead headed as the filter loads, then restart when the pressure drops.

Technical Features

How The Air End Is Built

The hydraulic end of an AODD pump is simple. The air end is where pumps differ, and where Nuodean holds its patents.

Major Air Valve Plus Pilot Air Valve
The pilot valve is shifted mechanically by the actuator pin and pneumatically by the compressed air, then it shifts the major valve. That two stage signal is what makes the changeover positive and fast.
Dual Ceramic Dynamic Seals
Both the major air valve and the pilot air valve run ceramic dynamic seals. They resist wear, tolerate a dirty air supply and keep discharge contamination down over a long life.
Self Lubricating Lube Free Air System
No lubricator is fitted to the air inlet and none is needed, which removes both a maintenance task and the oil mist that a lubricated pump puts into the room.
Anti Icing Vacuum Chamber
The built in vacuum chamber reduces discharge air pressure, which lowers the expansion cooling that causes icing and drops the exhaust noise. The published sound level is 64.5 dB(A) at 70 psi and 60 cycles per minute.
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
Center body, fluid caps and manifold, seat, ball check, diaphragm, connection thread and hardware are each chosen in the model code rather than fixed at the factory.

Specifications

Published Performance

Transcribed from the Nuodean data sheet published for this pump.

Maximum flow rate	47GPM(177.9LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/8"(3.2mm)
Fluid inlet	BSP 1", 1"NPT , Or 1" ANSI/DIN Flange
Fluid outlet	BSP1", 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	64.5db(A)
Weight	20.3 lbs(9.2kg)
Model series code	DP31

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	Non-metallic (polypropylene / pvdf)
Diaphragm options	Neoprene, Nitrile, E.P.R., Composite PTFE, Viton, Hytrel, PTFE / Santoprene, Santoprene
Ball check options	Neoprene, Nitrile, E.P.R., Polyurethane, Viton, Hytrel, PTFE, Santoprene
Seat options	316 Stainless Steel, Polypropylene, PVDF (Kynar), Hard 440 Stainless Steel
Housing options	Aluminum, Cast Iron

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

Fluid caps and manifold in polypropylene or PVDF
Seat in 316 stainless steel, polypropylene or PVDF
Ball check in neoprene, nitrile, E.P.R., polyurethane, Viton, Hytrel, PTFE, Santoprene
Diaphragm in neoprene, nitrile, E.P.R., composite PTFE, Viton, Hytrel, PTFE / Santoprene, Santoprene
NPT or BSP threaded fluid connections, polypropylene or PVDF 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 version	The aluminum pump delivers 35 GPM at the same pressure, but adds metal contamination. Choose aluminum when the fluid is benign and weight is critical.
Versus the 1 inch stainless steel version	The stainless steel pump offers maximum corrosion resistance, but at 35 GPM and 36 kg it is heavier and slower than this model.
Versus the 1 inch cast iron version	Cast iron is for abrasive slurry, not for corrosive liquids. This pump is the better choice for acids, alkalis and solvents.
Versus the 1-1/2 inch non metallic pump	The 1-1/2 inch pump delivers 100 GPM, but it is heavier at 62 kg and needs more air. Step up only when 177.9 LPM is not enough.
Versus a centrifugal pump	The centrifugal pump is cheaper to run with clean water, but cannot self prime, cannot run dry and cannot handle solids. It also needs electrical power.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 177.9 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 4.6 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, DP31-Air15, and one fluid section kit, DP31-Flu15, 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: product data sheets, series catalogues.

PDF 1 INCH NON METALLIC AODD PUMPS DATA SHEET Product Data Sheets PDF 1.3 MB Download PDF DP3X AODD PUMPS Catalogue Series Catalogues PDF 18.1 MB Download

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

Answers

1 Inch Non Metallic 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.

What diaphragm material should I choose?

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.

What is the sound level?

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 Rp 1, which is 1 inch parallel BSP, or 1 inch NPT. The air inlet is 1/4 inch BSPT female, with 1/4 inch NPT available on request.

Is this pump suitable for use with hydrochloric acid?

Polypropylene and PVDF are resistant to hydrochloric acid at lower concentrations and temperatures. Check the chemical compatibility chart for specific details and consider PTFE diaphragms and seals for maximum resistance.