2 Inch

2 Inch DP3X Air Operated Double Diaphragm Pumps

This size is the volume sweet spot in the DP3X range. It handles bulk transfer, filter press feed and high-volume recirculation without needing a motor. The 651 LPM flow from a single air line is a direct alternative to electric pumps.

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Models

Four Models For Four Fluids

Choose aluminum for weight and cost, stainless steel for corrosion resistance, cast iron for abrasion, or non-metallic for chemicals that attack metal.

Front view of a black industrial double diaphragm pump with red caps and green accents.

DP3X Series

2 Inch Aluminum Air Operated Double Diaphragm Pump

651 LPM and 8.3 bar from a 29.6 kg aluminum body. The volume workhorse of the DP3X range.

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A silver metallic industrial double diaphragm pump with red caps and a central black manifold.

DP3X Series

2 Inch Stainless Steel Air Operated Double Diaphragm Pump

651 LPM and 8.3 bar from a 56.9 kg stainless steel body. The corrosion resistant workhorse of the DP3X range.

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Front view of a symmetrical industrial double diaphragm pump with a black manifold and a central gold filter.

DP3X Series

2 Inch Cast Iron Air Operated Double Diaphragm Pump

651 LPM and 8.3 bar from a 56.4 kg cast iron body. The heavy duty workhorse of the DP3X range.

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Front view of a black industrial double diaphragm pump with red ports on a white background

DP3X Series

2 Inch Non Metallic Air Operated Double Diaphragm Pump

548.8 LPM 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 2 Inch DP3X Pumps

Operations that need high flow from a single air line and want to avoid electric motors, installation changes or complex piping.

Chemical plants transferring bulk acids and alkalis where a motor-driven pump would be a hazard
Paint and coating facilities feeding batching lines at 651 LPM without shearing the product
Metalworking shops pumping cutting fluid with chips through a 6.4 mm opening
Waste water plants feeding filter presses that require sustained high flow and dead head capability
Pharmaceutical and food producers moving shear-sensitive liquids at high volume without contamination

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

Problems Solved

What The 2 Inch DP3X Solves

This size was built for duties where flow volume matters more than pump weight or cost, and where a motor is not an option.

A 1 inch pump can't move enough fluid fast enough for bulk transfer, so a 2 inch model is the next logical step
A motor-driven pump requires a power supply, conduit and grounding, which are not always available in remote or hazardous areas
A pump that stalls mid-stroke or loses prime under high suction lift fails in tanker unloading or dry transfer
A pump with a noisy exhaust or high air consumption increases operating cost and noise levels
A pump that does not fit the existing base plate requires downtime and rework to install

Core Advantages

Four Reasons To Choose 2 Inch DP3X

651 LPM At 120 Psi

The 2 inch model reaches 651 LPM at 120 psi, the highest flow in the DP3X range below 3 inch. This flow is sufficient for most bulk transfer and press feed duties.

6.4 Mm Solids Handling

The 6.4 mm solids capacity handles most industrial slurries, including cutting fluid with metal chips and waste water with suspended solids.

Drop In Installation

Footprint, port positions and mounting holes match other brands. A 2 inch DP3X can replace an existing pump without changing the base or piping.

Low Air Consumption

The anti-icing design reduces discharge air pressure, which lowers air use and noise. The pump runs cooler and quieter than standard AODD designs.

Range Data

Performance Across The 2 Inch Models

The range envelope for the four 2 inch DP3X models, taken from individual data sheets.

Maximum flow rate	145 GPM (548.8 LPM) to 172 GPM (651 LPM)
Maximum operating pressure	120 psi (8.3 bar) across all models
Suspended solids max diameter	1/4 inch (6.4 mm) on all models
Maximum dry suction lift	14 feet (4.27 m) to 27.2 feet (8.3 m) depending on model
Body materials	Aluminum, stainless steel, cast iron, non-metallic
Weight	62 lbs (28.1 kg) to 125.4 lbs (56.9 kg)
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 2 Inch DP3X Duties

Tanker And Bulk Transfer

Self priming with a dry lift up to 8.3 m, so road tankers and IBCs are emptied from ground level without a sump pump.

Filter Press Feed

Maintains pressure as cake builds, dead heads at the end of the cycle, then restarts when the press is stripped.

High Volume Recirculation

Runs dry at the end of every cycle, so it can be used for system flush, clean down and reclamation without damage.

Chemical Transfer

Moves acids, alkalis and solvents at 651 LPM without risk of seal failure or contamination from metal parts.

Guides For The 2 Inch DP3X Range

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

2" DP3X Diaphragm Pumps FAQ

Which 2 inch DP3X model should I choose?

Pick aluminum for low weight and cost, stainless steel for corrosion resistance, cast iron for abrasion resistance, or non-metallic for aggressive chemicals. The flow and pressure are the same across all four.

Can I use a 2 inch DP3X to replace a pump from another brand?

Yes. The installation dimensions, port positions and mounting holes are compatible with other brands. Send the old pump's model code and we will confirm fit.

How much air does a 2 inch DP3X use?

The anti-icing design reduces discharge air pressure, which lowers air consumption. The exact amount depends on the operating pressure and flow, but it is less than standard AODD pumps.

What is the maximum dry suction lift?

It varies by model. The aluminum and non-metallic versions reach 14 feet (4.27 m), while the stainless steel and cast iron versions reach up to 27.2 feet (8.3 m).

Are the pumps certified for hazardous areas?

We do not publish an ATEX certificate. The pumps are air driven with no electric motor, which makes them suitable for hazardous areas, but if certification is required, contact us to confirm what documentation is available.

Select A 2 Inch DP3X For Your High Volume Duty

Tell us the fluid, the flow, the discharge head and your available air pressure. We will recommend the best body material and send the full model code.

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