1 Inch

1 Inch DP3X Air Operated Double Diaphragm Pumps

The 1 inch size is the lightest and quietest in the DP3X range. It fits where space is tight, weight matters, and flow is modest. It handles small batches, sensitive fluids, and repeated start-stop cycles without stalling.

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Models

Four Body Materials, One Size

Aluminum, stainless steel, cast iron and non-metallic. Each shares the same air end and port layout, so the choice is chemistry, weight and cost, not performance.

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

DP3X Series

1 Inch Aluminum Air Operated Double Diaphragm Pump

133 LPM and 8.3 bar from an 8.6 kg aluminum body. The compact workhorse of the DP3X range.

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Front view of a stainless steel pneumatic double diaphragm pump with green diaphragm rings and red port caps.

DP3X Series

1 Inch Stainless Steel Air Operated Double Diaphragm Pump

133 LPM and 8.3 bar from a 16.3 kg stainless steel body. The corrosion resistant workhorse of the DP3X range.

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Front view of a black industrial double diaphragm pump with green trim and red port caps

DP3X Series

1 Inch Cast Iron Air Operated Double Diaphragm Pump

133 LPM and 8.3 bar from a 14.1 kg cast iron body. The durable workhorse of the DP3X range.

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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

177.9 LPM and 8.3 bar from a 9.2 kg non metallic body. The entry point for corrosion resistance in the DP3X range.

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Who It Is For

Who Uses 1 Inch DP3X Pumps

Machines and processes that need a small, reliable pump with low noise and minimal weight.

OEM equipment builders integrating a pump into a compact machine or control panel
Chemical dosing stations requiring consistent, low-volume transfer without pulsation
Drum and IBC transfer lines where the pump must fit in a tight space and not add weight
Pharmaceutical and food processing lines handling shear-sensitive liquids in small batches
Maintenance teams replacing a failing pump in a system with no room for a larger model

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

Problems Solved

Why 1 Inch Is Better Than A Smaller Pump

The 1 inch DP3X is not just a scaled-down version. It uses the same air distribution system as the larger models, so it avoids common small pump issues.

Stalling on the first stroke, fixed by the pilot air valve that ensures a full shift every cycle
Noisy exhaust from air leakage, reduced by the self-lubricating, lube-free air system
Frequent seal failure from dirty air, solved by dual ceramic seals on both air valves
Inconsistent flow due to poor air pressure control, improved by the anti-icing design that stabilizes discharge pressure
Incompatibility with existing mounting, avoided by matching footprint and port positions to other brands

Core Advantages

Four Features That Matter In A Small Pump

Pilot Air Valve Shift

The pilot valve ensures the major valve shifts fully and quickly, so the pump starts reliably and runs without stalling, even on low air pressure.

Ceramic Seals On Air Valves

Dual ceramic dynamic seals on both the major and pilot air valves resist wear and keep the pump shifting cleanly over long service life.

Low Noise And Air Use

The anti-icing design reduces discharge air pressure, which lowers noise and cuts air consumption, ideal for indoor or enclosed spaces.

Drop In Fit

Mounting holes, port positions and base dimensions match other brands, so the 1 inch DP3X can replace an existing pump without rework.

Range Data

Performance Across The 1 Inch Models

The range of the four 1 inch DP3X models, taken from individual data sheets.

Maximum flow rate	133 LPM (35 GPM) in aluminum, cast iron and stainless steel; 177.9 LPM (47 GPM) in non-metallic
Maximum operating pressure	120 psi (8.3 bar) across all models
Suspended solids max diameter	3.2 mm (1/8") on all models
Maximum dry suction lift	4.6 m (15 ft) in aluminum; 6.1 m (20 ft) in stainless steel and cast iron
Weight	8.6 kg (19 lbs) in aluminum; 14.1 kg (31 lbs) in cast iron; 16.3 kg (36 lbs) in stainless steel; 9.2 kg (20.3 lbs) in non-metallic
Body materials	Aluminum, cast iron, 316 stainless steel, polypropylene and PVDF

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 Inch Duties

Drum And IBC Transfer

Self priming with a dry lift of up to 6.1 m, so drums and IBCs are emptied from floor level without a sump.

OEM Machine Integration

Compact size and low weight make it easy to mount inside control cabinets or on moving platforms.

Dosing And Blending

Air throttled flow control allows precise, repeatable delivery of small batches without shearing or foaming.

System Flush And Clean Down

Runs dry at the end of every cycle, so it clears lines without damage, ideal for cleaning between batches.

Guides For The 1 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

1" DP3X Diaphragm Pumps FAQ

Why does the non-metallic model have higher flow than the others?

The non-metallic model uses a lighter diaphragm and lower friction seals, allowing faster stroke cycles. This increases flow without raising air consumption or pressure.

Can I use the 1 inch DP3X for caustic liquids?

Yes, the non-metallic model is rated for caustic liquids. The aluminum, cast iron and stainless steel models are suitable for less aggressive fluids. Check the elastomer compatibility for your specific chemical.

Which 1 inch model is best for a noisy environment?

The aluminum model is the lightest and has the lowest noise output. The non-metallic model also runs quietly due to the anti-icing air system and lower discharge pressure.

Are the 1 inch pumps compatible with my existing installation?

Yes, the mounting footprint, port positions and base dimensions match other brands. If you have a pump with the same port size, the 1 inch DP3X can replace it without changing the pipework or base.

What is the dry suction lift for the stainless steel model?

The stainless steel model has a dry suction lift of 6.1 m (20 ft), which is the highest in the 1 inch series. This allows it to draw fluid from below the pump without a priming system.

Select A 1 Inch DP3X For Your Small Flow Duty

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

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