Nuodean engineering guides for air operated diaphragm pumps

Knowledge Center

Guides For People Who Have To Make The Pump Work

Written for the engineer specifying the duty and the technician who gets called when the pump slows down. No marketing, and every number traceable to a Nuodean data sheet.

Guides

All Guides

Working principle, selection, materials, troubleshooting and maintenance.

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

Choosing The Right Diaphragm Material For Your Fluid

Diaphragm selection is a balance between mechanical flex life and chemical compatibility. Pick the right material to avoid premature failures and process contamination.

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.

Troubleshooting

Why An Air Operated Diaphragm Pump Stalls And How To Stop It

When an AODD pump stops mid cycle, the cause sits between line pressure drops, valve spool balance points, and exhaust freezing. Here is how to find the root fault without guessing.

Process Guide

Icing Air Consumption And Noise In Diaphragm Pumps

Exhaust icing, high air demand and muffler noise all stem from compressed air expansion. Managing pressure drop and stroke speed solves all three.

Troubleshooting

Diaphragm Pump Troubleshooting From Symptom to Cause

Start from the symptom, confirm the air end or wetted end, and order the repair kit that matches the evidence.

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.

Maintenance Guide

A Maintenance Checklist For Air Operated Diaphragm Pumps

Keep your diaphragm pumps running reliably by standardising daily walk by checks, air end line testing, fluid section rebuilds, and stockholding of critical kits.

Buying Guide

How To Read A Nuodean Diaphragm Pump Model Code

Every character stamped on a Nuodean nameplate tells a plant engineer the exact metallurgy, elastomer selection, port thread, and rebuild kit required for the duty.

Comparison

DP3X Or WA Series Which Nuodean Pump Should You Buy

Compare the two core Nuodean AODD pump platforms to determine whether your facility needs the current generation DP3X or a direct like for like WA replacement.

Answers

About These Guides

Do these guides apply to other brands of AODD pump?

The physics does. Stroke cycle, suction lift, air consumption and elastomer chemistry behave the same way whoever built the pump. The model codes, part numbers and published performance figures are Nuodean's.

Where do the numbers in the guides come from?

From the data sheets and catalogues published on our download page. Where a figure depends on your installation rather than on the pump we say so instead of quoting a number.

Still Not Sure Which Pump The Duty Needs

Send us the fluid, the flow, the head and your air pressure. We will pick the model and explain why it is the right one.

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