Qingdao Nuodean Pump Co Ltd — air operated double diaphragm pumps since the DP series
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Nuodean AODD pumps for metalworking and machine tools
Industry Application

AODD Pumps For Metalworking And Machine Tool Shops

Cutting fluid, quenching oil, and swarf laden coolant are listed in our catalogues as applications. These duties involve high solids, frequent dry running, and variable flow demands. The wrong pump fails at the end of each shift, not at the end of a year.

Talk To An Engineer See Recommended Pumps
Pain Points

What Goes Wrong In A Machine Shop Duty

Three failure modes are common in coolant and quenching oil transfer.

The Pump Clogs On Swarf And Tramp Oil

Cutting fluid carries metal chips and oil that collect in the pump body. If the internal clearances are tight or the check valves are not designed for solids, the pump stops after a few hours of operation.

The Pump Fails When The Sump Runs Dry

Machine sumps empty at the end of each shift. Centrifugal pumps lose prime and overheat. A diaphragm pump continues to run dry without damage, but only if the materials and design are correct.

The Fluid Attacks The Body And Seals

Quenching oil and cutting fluid contain additives that degrade rubber and aluminum over time. A pump with a body or seal that is not resistant to these fluids will fail within weeks.

What Buyers Need

What Machine Shops Actually Specify

The specification usually comes down to five points, and all five are confirmed before the pump is ordered.

  • Aluminum body for light to medium duty, cast iron for heavy duty and high flow, with PTFE diaphragms and PTFE or PVDF seats for chemical resistance
  • Dry running and dead heading accepted as normal operation, with no requirement for a shaft seal
  • Self priming with dry suction lift of at least 5.8m (19 feet) to empty IBCs and sumps from ground level
  • Solids handling capacity of at least 6.4mm (1/4 inch) to pass swarf without clogging
  • Published drawings and part lists so the shop can keep repair kits on site for quick replacement
Drop In Replacement And RetrofitPump Selection And SizingAbrasive And High Solids Transfer
Front view of an industrial double diaphragm pump with black manifold and silver chambers.
Typical Duties

Typical Duties On A Machine Shop Floor

01

Machine Sump Emptying

Self priming from ground level with the pump above the sump, and dry running accepted at the end of each shift without damage.

02

Coolant Transfer Between Tanks

Transfer of swarf laden coolant between storage tanks, where the pump handles tramp oil and metal particles without clogging.

03

Quenching Oil Reclamation

Recycling quenching oil from a heat treatment line, where the pump runs continuously and tolerates dry periods between batches.

04

System Flush And Line Cleaning

Flushing coolant lines between different machines, where the pump must handle air, liquid, and solids in sequence.

How We Work

How We Get From Enquiry To Pump

Four steps. The first one is the only one that matters, and it is the one most enquiries skip.

  1. Name The Fluid Properly

    Cutting fluid, quenching oil, or coolant with tramp oil. Specify if it is water based or oil based. The wetted materials must match the fluid chemistry.

  2. Fix The Wetted Materials

    We set the body, seat, ball, and diaphragm against the fluid. Aluminum is suitable for most cutting fluids. Cast iron is used for high flow and heavy solids. All models use PTFE diaphragms.

  3. Set The Duty Point

    Flow at your discharge head with your available air pressure. The 1 inch pump handles up to 133 LPM, the 2 inch up to 651 LPM, the 3 inch up to 897 LPM. Choose the port size based on flow, not pipe size.

  4. Agree The Spares Package

    One air section kit and one fluid section kit coded to your elastomer choice, so the first failure is a fifteen minute job rather than a three week wait.

Supply And Delivery

What Ships With The Pump

Related Guides

Guides For Machine Shop Duty

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

Metalworking And Machine Tools Pump FAQ

Can the aluminum pump handle quenching oil?

Yes, aluminum is suitable for quenching oil and most cutting fluids. The pump uses PTFE diaphragms and PTFE or PVDF seats, which resist the additives in these fluids. Confirm the fluid type and temperature before ordering.

What is the maximum solids size the pump can pass?

The 1 inch pump handles solids up to 3.2mm (1/8 inch), the 1-1/2 inch and 2 inch pumps up to 6.4mm (1/4 inch), and the 3 inch pump up to 9.5mm (3/8 inch). All models are designed for swarf and tramp oil without clogging.

How deep can the pump lift from a sump?

The 1 inch pump has a dry suction lift of 6.1m (20 feet), the 1-1/2 inch pump 5.8m (19 feet), the 2 inch pump 8.3m (27.2 feet), and the 3 inch pump 5.4m (17.6 feet). All can self prime from ground level.

Is the pump suitable for continuous duty?

Yes, the pumps are designed for continuous operation. The air motor and diaphragms are rated for long cycles. The 2 inch and 3 inch models are used in high flow applications with no downtime.

Can the pump run dry without damage?

Yes, all models are rated for dry running and dead heading. The diaphragm and check valves are designed to operate without fluid. No shaft seal means no risk of overheating.

Send Us The Fluid And The Duty

Fluid type, flow, discharge head, and suction lift. We will come back with the model code, wetted part list, and a price.

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