Front view of a black double diaphragm pump with red caps and bolted connections

Black industrial double diaphragm pump with three chambers and red port covers on a white background.

Specialty Pumps

1-1/2 Inch High Pressure Triple Diaphragm Pump

The DP32-40 is a 1-1/2 inch high pressure triple diaphragm pump in the Specialty series. It delivers up to 90 GPM at 7 bar fluid pressure, which is double the output of a standard AODD pump at the same air pressure. The 2:1 discharge ratio is achieved by applying air pressure to a larger surface area on the diaphragm, which forces the fluid diaphragm to move more fluid per stroke. It lifts 5.8 m dry and handles solids up to 6.4 mm. The pump is built for systems where 120 psi is not enough to overcome resistance, such as long lines, high elevation, or high viscosity fluids.

Maximum flow rate	90GPM (340.7LPM)
Maximum operating pressure	100psi (7bar)
Fluid pressure range	20-200psi (1.4-14bar)
Suspended solids max diameter	1/4" (6.4mm)
Fluid inlet	1-1/2"BSPT Or 1-1/2"NPT

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Paints Inks And Coatings Chemical Processing

Key Benefits

What The 2:1 Ratio Delivers

The triple diaphragm design is not about flow. It is about pressure, and the ratio is what makes it work.

Double The Pressure Without More Air

The 2:1 ratio means the air side diaphragm area is twice the fluid side area. At 100 psi air input, the fluid side sees 200 psi output. This allows high pressure transfer without needing a larger air compressor.

Stable Flow At High Pressure

Unlike single diaphragm pumps that lose flow as pressure rises, the triple diaphragm maintains near-constant output across the pressure range. This is useful in dosing, spraying and long line transfer.

No Need For A Booster Pump

When the system resistance exceeds 120 psi, a booster is usually required. This pump can meet that demand directly from a standard air supply.

Lighter Than The 2 Inch Version

At 50 kg, it is 40 kg lighter than the 2 inch triple diaphragm pump. That makes it easier to install and move between stations.

Compatible With Standard Air Lines

The 3/8 inch BSPT air inlet is standard on most plants. No special air fittings or regulators are needed to start.

Handles Solids That Clog Standard Pumps

The 6.4 mm solids pass through the ball check and seat. This is the same as the 2 inch model, so it handles grit and slurry in high pressure duty.

Who It Is For

Who Buys This Pump

This pump is for plants that need pressure above 120 psi but cannot use a booster. It is not for general transfer. It is for systems where pressure is the real constraint.

Chemical plants transferring viscous resins through long lines or high elevation runs
Pharmaceutical facilities dosing high viscosity batches into reactors under pressure
Surface preparation shops spraying cleaning agents at high pressure through nozzles
3D printing facilities feeding resin into high pressure dispensing systems
OEMs building pressure vessels or test rigs that need a reliable fluid source
Maintenance teams replacing a booster pump with a single air-driven solution

Problems It Solves

Problems This Pump Is Bought To Fix

Every order for this pump starts with a system that cannot deliver pressure at flow.

A standard AODD pump stalls at 120 psi, while this pump delivers 200 psi on the same air supply
A booster pump adds noise, electrical risk and maintenance, while this pump runs on clean air
A high viscosity fluid slows down a centrifugal pump, but this pump maintains flow at 7 bar
A long line with multiple valves and fittings drops pressure below 120 psi, but this pump overcomes it
A plant cannot run an electric pump in a solvent area, but this air-driven pump avoids the classification

Application Scenarios

Where It Ends Up In A Plant

High Pressure Dosing And Blending

The pump maintains flow at 200 psi, so it can feed a mixing tank under pressure without a booster.

Spray Booth And Surface Treatment

It delivers a steady stream of cleaning fluid or coating at 14 bar to a spray gun or nozzle.

Resin Transfer In 3D Printing

It pushes viscous resin through a manifold at 14 bar, which is needed to fill small channels.

System Flush And Pressure Testing

It can pressurize a line to 14 bar for testing, then flush it with a solvent without switching pumps.

Technical Features

How The Triple Diaphragm System Works

The 2:1 ratio is not a trick. It is a mechanical advantage built into the air end.

2:1 Discharge Ratio
The air diaphragm area is twice the fluid diaphragm area. When air pressure is applied, it forces the fluid diaphragm to move twice the volume per stroke.
Dual Air End With Shared Actuator
Two air diaphragms are linked to a single actuator pin. They alternate to drive the fluid diaphragm, with the air pressure ratio dictating the fluid output.
Ball Check And Seat For Solids
The ball check and seat are sized to pass 6.4 mm solids. They are replaceable and match the model code.
Self Contained Air Distribution
No external lubricator is needed. The system is lube free and self lubricating, so no oil mist is produced.
Interchangeable Wetted Parts
The diaphragm, ball, seat and hardware are all selectable in the model code. Each is coded and listed on the data sheet.
Standard Air Inlet And Exhaust
The 3/8 inch BSPT air inlet and 3/4 inch BSPT exhaust are standard. The NPT version is available on request.

Specifications

Published Performance

Transcribed from the Nuodean data sheet published for this pump.

Maximum flow rate	90GPM (340.7LPM)
Maximum operating pressure	100psi (7bar)
Fluid pressure range	20-200psi (1.4-14bar)
Suspended solids max diameter	1/4" (6.4mm)
Fluid inlet	1-1/2"BSPT Or 1-1/2"NPT
Fluid outlet	1-1/2"BSPT Or 1-1/2"NPT
Air inlet	3/8"BSPT (3/8" NPT Available On Request)
Maximum dry suction lift	19feet (5.8m)
Sound level	70PSI 60 Cycles/Min 88.0db(A)
Weight	110 lbs (50kg)
Pump Size	40-1 1/2"
Model series code	DP32-40XXXXXXX, DP32-40XXXXXXXX

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 StainlessSteel, 4-PVDF(Kynar), 5-CarbonSteel, E-Santoprene, 8-Hard StainlessSteel, 9-Hytrel, G-Nitrile
Housing options	Center Body Mat.: A-Aluminum, C-CastIron, FluidCaps Manifold Mat.: A-Aluminum, S-StainlessSteel, C-CastIron
Fluid Connections	N-NPTThreads / B-BSPThreads
Hardware	S-StainlessSteel / C-CarbonSteel

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 shipment to verify shift timing and pressure build-up
Sound level is measured at 70 psi and 60 cycles per minute, published at 88.0 dB(A)
All wetted parts are checked against the ordered model code during assembly
The pump ships with the data sheet and both the fluid and air section part lists

Customization

What You Can Change

Diaphragm in nitrile, PTFE with Santoprene backing, Hytrel or Santoprene
Ball check in nitrile, Hytrel, PTFE or Santoprene
Seat in aluminum, 316 stainless steel, PVDF, carbon steel, Santoprene, hard stainless steel, Hytrel or nitrile
Fluid connections in NPT or BSP threaded style
Hardware in stainless steel or carbon steel
Air inlet in 3/8 inch NPT on request

Comparison

Against The Alternatives

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

Versus the 1 inch triple diaphragm pump	The 1 inch model gives 35 GPM at 7 bar. This 1-1/2 inch model gives 90 GPM at the same pressure. Choose the 1 inch only when flow is not the main need.
Versus the 2 inch triple diaphragm pump	The 2 inch model gives 172 GPM at 6.9 bar. This 1-1/2 inch model gives less flow but higher pressure. Choose the 2 inch when flow is the priority.
Versus the 1-1/2 inch ZG series pump	The ZG series gives 378 LPM at 8.4 bar. This pump gives less flow but higher pressure. Choose the ZG when volume is needed, not pressure.
Versus a standard 1-1/2 inch AODD pump	The standard pump maxes at 120 psi. This pump reaches 200 psi. Choose the standard pump when pressure is not an issue.
Versus a booster pump	The booster adds noise, electrical risk and maintenance. This pump runs on clean air and needs no power. Choose the booster only when pressure exceeds 200 psi.
Versus a centrifugal pump	The centrifugal is more efficient at high flow with clean fluid. This pump wins when pressure is high, flow is moderate, or the fluid is viscous.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump hits 90 GPM or drops to 60.

Use The Full 100 PSI Air Supply
The 2:1 ratio depends on air pressure. At 100 psi input, the fluid side reaches 200 psi. Lower air pressure reduces output.
Do Not Block The Discharge
The pump can be dead headed. But a blocked discharge at 200 psi will stress the system. Use a pressure relief valve if needed.
Match The Elastomer To The Fluid
Nitrile for petroleum, PTFE/Santoprene for acids and solvents, Hytrel for high temperature and abrasion. Wrong material leads to failure.
Keep The Air Supply Clean
Dirt in the air supply can jam the ball check or wear the seals. Use a filter and regulator on the air line.
Use A Pressure Relief Valve On The Line
If the system has a closed valve or high resistance, a relief valve prevents overpressure on the pump and the piping.

Documents

Documents For This Pump

Straight from Nuodean's own literature: product data sheets, series catalogues.

PDF 1.5 inch triple diaphragm pump data sheet 1 Product Data Sheets PDF 1.1 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

1-1/2 Inch High Pressure Triple Diaphragm Pump FAQ

What is the maximum fluid pressure this pump can deliver?

The fluid pressure range is 20 to 200 psi (1.4 to 14 bar). This is the output pressure at the fluid outlet. The air supply must not exceed 100 psi.

Can it run dry?

Yes. The pump can be run dry without damage. It is designed to handle dry starts and dead heading, which is common in high pressure systems.

What is the largest solid it will pass?

1/4 inch, which is 6.4 mm, through the ball check and seat. If your fluid carries larger solids, the 3 inch flap-valve pump passes up to 50 mm.

Will it replace a booster pump?

Yes, in many cases. It delivers 200 psi from a 100 psi air supply, which is the same as a booster. It avoids electrical risk and needs no maintenance.

Which diaphragm should I order?

PTFE with Santoprene backing for aggressive chemicals, Santoprene for long life and flexibility, Hytrel for high temperature and abrasion. Tell us the fluid and temperature and we will suggest the right code.

How loud is it?

88.0 dB(A) at 70 psi and 60 cycles per minute, as measured on the data sheet. Slower cycling or a muffler reduces the sound level.

What connections does it come with?

Fluid inlet and outlet are 1-1/2 inch BSPT or 1-1/2 inch NPT. The air inlet is 3/8 inch BSPT. The NPT version is available on request.