1-1/2" DP3X Diaphragm Pumps from Nuodean

1-1/2 Inch

1-1/2 Inch DP3X Air Operated Double Diaphragm Pumps

This size is the practical choice for transfer duties that outgrow a 1 inch pump but don't need the full capacity of a 2 inch. It handles higher flow and larger solids than the smaller size, with the same reliable air distribution and compatibility.

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Models

Four Models, One Platform

Aluminum, cast iron, 316 stainless steel and non-metallic. All share the same air end and mounting, so selection is based on fluid chemistry, weight and cost.

Front view of an industrial double diaphragm pump with black manifold and silver chambers.

DP3X Series

1-1/2 Inch Aluminum Air Operated Double Diaphragm Pump

340.7 LPM and 8.3 bar from a 23.4 kg aluminum body. The mid-range volume pump in the DP3X series.

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Front view of a stainless steel industrial double diaphragm pump with red caps on a white background.

DP3X Series

1-1/2 Inch Stainless Steel Air Operated Double Diaphragm Pump

340.7 LPM and 8.3 bar from a 38.3 kg stainless steel body. The durable workhorse of the DP3X range.

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3D render of a black industrial diaphragm pump with red port and mounting feet

DP3X Series

1-1/2 Inch Cast Iron Air Operated Double Diaphragm Pump

340.7 LPM and 8.3 bar from a 36.1 kg cast iron body. The rugged workhorse of the DP3X range.

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Front view of a gray industrial double diaphragm pump with flanged connections and a central air valve.

DP3X Series

1-1/2 Inch Non Metallic Air Operated Double Diaphragm Pump

378.5 LPM and 8.3 bar from a 28.1 kg non metallic body. The chemical duty workhorse of the DP3X range.

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Who It Is For

Who Uses The 1-1/2 Inch DP3X

Plants that need more flow than a 1 inch pump can deliver, or that handle fluids with small solids, but don't need the heaviest-duty body.

Chemical plants transferring acids, alkalis and solvents with 6.4 mm particles
Paint and coating facilities feeding batching lines with pigment-laden liquids
Metalworking shops pumping cutting fluid with metal chips up to 6.4 mm
Waste water treatment plants moving sludge and filtered liquids with suspended solids
Pharmaceutical and food processing lines handling shear-sensitive fluids with small particulates
OEMs needing a pump with published drawings and stable model codes for integration

Metalworking And Machine Tools Paints Inks And Coatings Chemical Processing Food And Pharmaceutical

Problems Solved

Why This Size Was Built

The 1-1/2 inch model solves the gap between the 1 inch and 2 inch pumps. It's not a scaled-up version, but a purpose-built step up.

1 inch pumps stalling under heavy solids or high flow, solved by the larger port and improved air distribution
Flow dropping off at 1 inch when solids exceed 3.2 mm, addressed by the 6.4 mm solids handling capability
Need for a heavier body than aluminum but not full cast iron, met by the 316 stainless steel and non-metallic options
Installation changes required when upgrading from 1 inch, avoided by matching footprints and mounting positions
Pulsation and noise increasing at higher flow, reduced by the pilot air valve and anti-icing design

Core Advantages

Four Key Features In This Size

6.4 Mm Solids Handling

The 1-1/2 inch port clears particles up to 6.4 mm, allowing it to move fluids with small solids that would block a 1 inch pump.

Stall-Free Operation

The pilot air valve ensures a decisive shift at every stroke, preventing mid-stroke stalls even under high discharge pressure.

Lube-Free Air System

Dual ceramic seals on both air valves eliminate the need for oilers and reduce maintenance, even with dirty compressed air.

Drop-In Fit

Mounting positions and base dimensions match other brands, so replacement is possible without cutting or re-drilling pipework.

Range Data

Performance Range

The envelope across the four 1-1/2 inch DP3X models, taken from individual data sheets.

Port size	1-1/2 inch
Maximum flow rate	90 GPM (340.7 LPM) to 100 GPM (378.5 LPM)
Maximum operating pressure	120 psi (8.3 bar)
Suspended solids max diameter	1/4 inch (6.4 mm)
Maximum dry suction lift	14 feet (4.27 m) to 19 feet (5.8 m) depending on model
Body materials	Aluminum, cast iron, 316 stainless steel, non-metallic
Air inlet	1/2 inch BSPT female, NPT available on request

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.

Application Scenarios

Typical 1-1/2 Inch Duties

Bulk Transfer From IBCs

Self priming with a dry lift of up to 5.8 m, so IBCs and drum banks are emptied without external priming.

Filling Line Feed

Flow throttled to match filling heads, with minimal pulsation and no shearing of sensitive liquids.

Sludge And Waste Water Transfer

Handles small solids in sludge and filtered effluent, with the ability to dead head and restart without damage.

System Flush And Recirculation

Runs dry at the end of each cycle, with no risk of air end damage due to the lube-free design.

Guides For The 1-1/2 Inch DP3X

Working Principle

How An Air Operated Double Diaphragm Pump Works

Follow one full stroke through the pilot valve, the major air valve and both liquid chambers, and the rest of the pump stops being mysterious.

Buying Guide

How To Size An Air Operated Double Diaphragm Pump

Sizing an air diaphragm pump from the existing pipe size or the headline maximum flow guarantees poor performance. Here is how to select the right displacement and port size from actual duty conditions.

Material Guide

Aluminum Cast Iron Stainless Steel or Polypropylene Pump Body

Compare aluminum, cast iron, stainless steel and non metallic bodies by fluid, duty and weight, not by habit.

Answers

1-1/2" DP3X Diaphragm Pumps FAQ

When should I choose 1-1/2 inch over 1 inch?

Use 1-1/2 inch when flow exceeds 133 LPM or when solids are larger than 3.2 mm. The 1-1/2 inch handles 6.4 mm particles and delivers up to 378.5 LPM.

Which body material is best for caustic chemicals?

316 stainless steel or non-metallic are suitable for caustic chemicals. Non-metallic offers better resistance to strong alkalis and acids.

Can I replace a 1 inch pump with this size without changing the base?

Yes. The 1-1/2 inch DP3X has the same footprint and mounting positions as other brands, so it fits in the same space as a 1 inch pump.

Are the pumps certified for hazardous areas?

We do not publish ATEX or similar certification. The pumps are air driven with no electric motor, which supports use in hazardous areas, but we recommend confirming documentation with us before installation.

What is the lead time for a 1-1/2 inch pump?

It depends on the body material and elastomer combination. Send the model code and quantity, and we will confirm the delivery date with the quotation.

Select A 1-1/2 Inch DP3X For Your Application

Tell us the fluid, flow, solids size, and available air pressure. We will recommend the best body material and model code.

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