Specialty Pumps

Specialty Series Air Operated Double Diaphragm Pumps

These pumps exist because a standard AODD cannot do the job. Each model solves a specific operational challenge: high pressure in long lines, dry powder transfer, or passage of large solids.

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Models

Five Pumps For One Hard Job Each

Each pump is built for a single, demanding duty. The 2:1 triple diaphragm pumps for high pressure spray, the dry powder pump for bulk solids, and the flap valve pump for oversized solids.

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

Specialty

1 Inch High Pressure Triple Diaphragm Pump

133 LPM at 7 bar fluid pressure from a 23 kg pump. The 2:1 ratio delivers high pressure without needing high air supply.

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

Specialty

1-1/2 Inch High Pressure Triple Diaphragm Pump

90 GPM at 7 bar from a 50 kg triple diaphragm pump. The 2:1 ratio delivers high pressure without needing more air.

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Industrial double diaphragm pump assembly with attached air filter, regulator, and pressure gauge.

Specialty

Air Operated Dry Powder Diaphragm Pump

Transfer dry powders up to 45 lbs per cubic foot with a portable, self-contained system. No complex piping or fixed installations.

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Black double diaphragm pump with green O-rings and flanged connections on a white background

Specialty

Heavy Duty Flap Valve Diaphragm Pump

647 LPM and 8.3 bar from a 130 kg pump built for 50 mm solids. The only AODD in the range with a horizontal fluid path.

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Front view of a stainless steel double diaphragm pump with green gaskets and a red center button.

Specialty

2 Inch High Pressure Triple Diaphragm Pump

172 GPM and up to 200 psi fluid pressure from a 90 kg triple diaphragm design. The high pressure workhorse of the Specialty series.

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Who It Is For

Who Uses These Specialty Pumps

Plants that face tasks where standard AODD pumps fail: pressure drop, clogging, or material damage.

Paint and coating lines using long hoses for spray application where pressure must hold over 100 feet
Pharmaceutical and food plants transferring dry powders like starch or protein without air entrainment
Waste treatment plants feeding sludge presses with material containing large debris
Metalworking shops pumping abrasive slurry with 50 mm chunks of scale or metal fragments
Bulk handling operations moving dry materials like cement, lime, or pigment in silos and hoppers

Paints Inks And Coatings Chemical Processing Food And Pharmaceutical

Problems Solved

What These Pumps Solve

Each model addresses a failure mode that standard AODD pumps cannot overcome.

Pressure drop in long hoses, fixed by the 2:1 high pressure triple diaphragm design that maintains output at 100 psi over extended runs
Powder bridging and air carryover, solved by the dry powder pump's airless transfer and gravity-assist feed
Clogging from large solids, prevented by the heavy duty flap valve pump's 50 mm passage and open flow path
Excessive wear from abrasive materials, reduced by the triple diaphragm pump's balanced load and lower stroke frequency
Inability to start on dry powder, overcome by the powder pump's sealed inlet and dry start capability

Core Advantages

Three Design Principles For Hard Jobs

2:1 Triple Diaphragm Action

Two diaphragms drive one discharge stroke, increasing pressure output without raising air pressure. This allows 100 psi output with standard air supply.

Flap Valve For Large Solids

A single, wide-opening flap valve allows 50 mm solids to pass without obstruction. The valve seat is reinforced for wear resistance in abrasive service.

Dry Powder Feed System

No air assist or external feed mechanism. The pump draws powder directly from a hopper and moves it in a sealed, non-aerated stream.

Range Data

Range Performance

The envelope across all five Specialty models, taken from individual data sheets.

Port sizes	1 inch, 1-1/2 inch, 2 inch
Maximum flow rate	35 GPM (133 LPM) at 1 inch to 172 GPM (651 LPM) at 2 inch
Maximum operating pressure	100 psi (7 bar) on 1 inch and 1-1/2 inch models, 100 psi (6.9 bar) on 2 inch, 120 psi (8.3 bar) on the flap valve pump
Suspended solids max diameter	1/8 inch (3.2 mm) on 1 inch, 1/4 inch (6.4 mm) on 1-1/2 inch and 2 inch, 2 inches (50 mm) on the flap valve pump, dry powder up to 45 lbs per cubic foot (721 kg per cubic meter)
Maximum dry suction lift	19 feet (5.8 m) on 1 inch, 20 feet (6.1 m) on 1-1/2 inch, 27.2 feet (8.3 m) on 2 inch
Body materials	Cast iron, 316 stainless steel, polypropylene
Air inlet	1/4 inch to 3/4 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 Specialty Duties

Long Line Spray Application

High pressure output at 100 psi is maintained over 100 feet of hose, allowing consistent spray pattern and atomization in industrial coating lines.

Dry Powder Transfer

Bulk powder moves from silo to reactor without air carryover, preventing dust clouds and material degradation.

Large Solid Passage

Sludge or industrial waste with 50 mm chunks passes through the pump without clogging or damage to the diaphragm.

High Flow High Pressure Duty

The 2 inch triple diaphragm pump delivers 172 GPM at 100 psi, suitable for high volume transfer in chemical or food processing.

Guides For The Specialty Range

Product Guide

What A Two To One High Pressure Triple Diaphragm Pump Does

By stepping down effective fluid surface area relative to drive air surface area, a 2:1 triple diaphragm pump overcomes discharge heads that stall conventional double diaphragm pumps.

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.

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

Specialty Diaphragm Pumps FAQ

Can I use a standard AODD pump for dry powder?

No. Standard AODD pumps rely on fluid to seal the diaphragm and prime the pump. Dry powder cannot provide this seal, leading to air leaks and failed starts. The dry powder pump is designed to start and run dry.

Why does the 2:1 triple diaphragm pump have higher pressure than a standard AODD?

The 2:1 design uses two diaphragms to push one discharge stroke, doubling the force without increasing air pressure. This allows 100 psi output from a standard 80 psi air supply.

What is the maximum solid size the flap valve pump can pass?

The flap valve pump passes solids up to 2 inches (50 mm) in diameter. The valve opens fully and the flow path is unobstructed, allowing large chunks to pass without jamming.

Are the specialty pumps ATEX certified?

We do not publish an ATEX certificate. The pumps are air driven with no electric motor, which reduces ignition risk. If your application requires certification, contact us to confirm what documentation is available.

What lead time should I plan for?

Lead time depends on the model and material combination. The dry powder pump and flap valve pump are built to order. Send the model code and quantity for a confirmed delivery date.

Specify A Specialty Pump For Your Hard Duty

Send the material type, flow, pressure, and solid size. We will recommend the right model and provide the full code.

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