Stainless steel double diaphragm pump with red caps and black air lines on a white background.

3D rendering of a stainless steel double diaphragm pump with black center block and red port caps.

Computer-generated rendering of a stainless steel double diaphragm pump with red port covers.

Stainless steel pneumatic double diaphragm pump with red port caps and black center block

3D render of a metallic double diaphragm pump with red port caps on a white background

Specialty Pumps

1 Inch High Pressure Triple Diaphragm Pump

The DP32-25 is a one inch triple diaphragm pump in the Specialty series, built for applications where standard AODD pumps cannot generate enough pressure. It uses a 2:1 discharge ratio to double the fluid pressure output for a given air supply. With a maximum air inlet pressure of 100 psi (7 bar), it delivers a fluid pressure range of 20 to 200 psi (1.4 to 14 bar). It moves up to 133 LPM at full air supply, passes solids to 3.2 mm, and lifts 6.1 m dry. The pump is designed for high pressure duty where a standard pump would stall or fail to deliver.

Maximum flow rate	35GPM (133LPM)
Maximum operating pressure	100psi (7bar)
Fluid pressure range	20-200psi (1.4-14bar)
Suspended solids max diameter	1/8" (3.2mm)
Fluid inlet	1"BSPT Or 1"NPT

Request A Quote [email protected]?subject=Inquiry%3A%201%20Inch%20High%20Pressure%20Triple%20Diaphragm%20Pump

Paints Inks And Coatings Chemical Processing

Key Benefits

What The 2:1 Ratio Buys You

The triple diaphragm design is not about more flow. It is about pressure. This pump makes high pressure without needing high air pressure.

Double The Pressure With The Same Air

The 2:1 ratio applies air pressure to a larger diaphragm surface area than the fluid side, so the fluid output pressure is doubled. A 100 psi air supply gives up to 200 psi fluid pressure without changing the air end.

No Need For A High Pressure Air Supply

The pump operates on standard 100 psi air, so no high pressure compressor or air receiver is needed. It fits into existing air systems without modification.

It Can Handle High Pressure Without Stalling

The air end is designed to handle the full 100 psi air inlet pressure, and the fluid end is built for 14 bar. The pump does not stall or lose flow when the discharge pressure rises.

Lighter Than A Standard High Pressure Pump

At 23 kg, it is less than half the weight of the 1.5 inch triple diaphragm pump at 50 kg. This makes it easier to mount and move between stations.

Low Sound Level For A High Pressure Pump

At 70 dB(A) at 70 psi and 60 cycles per minute, it is quieter than most high pressure pumps. A piped exhaust reduces it further.

It Fits Where A Standard Pump Sits

Port positions, mounting holes and overall envelope match the major AODD brands. The base, pipe spools and air line usually stay the same.

Who It Is For

Who Buys This Pump

This pump is for plants that need high pressure but do not want to run a high pressure air system. It is for applications where a standard AODD pump cannot deliver the required pressure.

Pharmaceutical and chemical plants dosing high pressure into reactors, filters or spray nozzles
Surface preparation shops using high pressure for cleaning, rinsing or coating application
3D printing facilities feeding resin or coating material under pressure into a build chamber
OEMs integrating a high pressure transfer pump into a skid-mounted system or a washing rig
Maintenance teams needing a portable pump for high pressure flushing or cleaning of lines
Plants replacing a competitor high pressure pump and wanting to keep 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 things.

A standard AODD pump stalls when the discharge pressure reaches 100 psi, while this pump delivers up to 200 psi without stalling.
A high pressure electric pump needs a motor, starter and area classification, while this pump runs on 100 psi air and avoids that paperwork.
A centrifugal pump cannot handle high pressure and dry suction, while this pump self primes and can be run dry.
A larger triple diaphragm pump at 50 kg is too heavy to move between stations, while this 23 kg model can be carried by one person.
A high pressure air system is not available, and this pump works on standard 100 psi air without needing a compressor upgrade.

Application Scenarios

Where It Ends Up In A Plant

01

High Pressure Dosing And Filling

The pump delivers consistent pressure for dosing into a reactor or filling a high pressure vessel, even as the discharge head changes.

02

Spray and Rinse Systems

It feeds a high pressure spray nozzle or a cleaning rig, where the fluid must be delivered at 14 bar or more to break down residue.

03

System Flush And Cleaning

It runs dry and can be dead headed, so it flushes lines and cleans tanks without damage, even under high pressure.

04

Reactor And Filter Feed

It feeds a reactor or a filter under pressure, where a standard pump would not generate enough force to push the fluid through.

Technical Features

How The Air End Is Built

The triple diaphragm design is not about more flow. It is about pressure. The 2:1 ratio is the key.

2:1 Discharge Ratio
The air side diaphragm has twice the surface area of the fluid side. This means air pressure is applied over a larger area, doubling the fluid output pressure for the same air input.
Dual Diaphragm Seals
Each diaphragm is sealed with a dual dynamic seal. The primary seal is the diaphragm itself, and the secondary seal is a backup in the diaphragm housing, reducing the risk of fluid leakage.
Self Lubricating Air System
No oiler is fitted to the air inlet. The air distribution system is self lubricating and lube free, so there is no oil mist and no maintenance task.
Low Noise Exhaust
The exhaust is designed to reduce noise. At 70 dB(A) it is quieter than most high pressure pumps, and a piped exhaust reduces it further.
Interchangeable Installation Envelope
Port positions, foot spacing and overall footprint are compatible with the major AODD brands, so the base, pipe spools and air line usually stay the same.
Selectable Wetted Materials
Center body, fluid caps, manifold, seat, ball check, diaphragm 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	35GPM (133LPM)
Maximum operating pressure	100psi (7bar)
Fluid pressure range	20-200psi (1.4-14bar)
Suspended solids max diameter	1/8" (3.2mm)
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	70db(A) (70PSI, 60 Cycles/Min)
Weight	51 lbs (23kg)
Pump Size	25-1"
Model series code	DP32-25XXXXXXXX

Materials

Material Options

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

Diaphragm options	2-Nitrile, 4-PTFE/Santoprene, 9-Hytrel, B-Santoprene
Ball check options	2-Nitrile, C-Hytrel, 4-PTFE, E-Santoprene
Seat options	1-Aluminum, 2-316 Stainless Steel, 4-PVDF (Kynar), 5-Carbon Steel, E-Santoprene, 8-Hard Stainless Steel, 9-Hytrel, G-Nitrile
Housing options	A-Aluminum, C-Cast Iron, S-Stainless Steel
Center Body Mat	A-Aluminum, C-Cast Iron
Fluid Caps Manifold Mat	A-Aluminum, S-Stainless Steel, C-Cast Iron
Fluid Connections	N-NPT Threads, B-BSP Threads
Hardware	S-Stainless Steel, C-Carbon 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 or cast iron
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
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 1.5 inch triple diaphragm pump	The 1.5 inch model delivers 340.7 LPM at 7 bar, but weighs 50 kg. Choose the 1 inch model when you need high pressure and lower weight, not more flow.
Versus the 2 inch triple diaphragm pump	The 2 inch model gives 651 LPM at 6.9 bar, but weighs 90 kg. Use the 1 inch model when you need high pressure and portability, not volume.
Versus the 1 inch ZG series pump	The ZG series reaches 150 LPM at 8.4 bar, but is not designed for 2:1 pressure doubling. Choose the triple diaphragm pump when you need up to 14 bar.
Versus the 1 inch DP3X aluminum pump	The DP3X model gives 651 LPM at 8.3 bar, but cannot deliver 14 bar. Choose the triple diaphragm pump when you need pressure, not flow.
Versus a centrifugal pump with a pressure booster	The booster adds cost, complexity and maintenance. This pump delivers high pressure directly from air, with no extra parts or power source.
Versus a piston pump	The piston pump requires a motor, a drive system and more maintenance. This pump runs on air, is self priming and can be run dry.

Use Guide

Getting The Best Out Of It

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

Supply Full Air Pressure
Flow and pressure follow air. Use the full 100 psi 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, 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 6.1 m is a dry lift figure. Priming a flooded suction is easier, so put the pump below the tank where the layout allows.
Stock The Two Repair Kits
One air section kit, DP32-Air25, and one fluid section kit, DP32-Flu25, 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 triple diaphragm pump data sheet 2 Product Data Sheets PDF 1.3 MB Download PDF DP11 Series Diaphragm Pump Catalogue Series Catalogues PDF 9.2 MB Download

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

Answers

1 Inch High Pressure Triple 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?

1/8 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 one inch AODD pump?

Usually yes. The DP3X 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, Hytrel for high temperature and abrasion, 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?

70 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 1 inch BSPT or 1 inch NPT. The air inlet is 1/4 inch BSPT female, with 1/4 inch NPT available on request.