A collection of industrial diaphragm pumps in various sizes and materials, including black, silver, and white models.

ZG Series

ZG Series Air Operated Double Diaphragm Pump

The ZG Series is a mid-sized air operated double diaphragm pump for general industrial transfer, batching and system circulation. It handles flows from 57 LPM at 1/2 inch up to 378 LPM at 1.5 inch, with operating pressure up to 8.4 bar at 1 inch and 1.5 inch. The pump is available in aluminum, stainless steel or plastic (PP or PVDF) body materials. It passes suspended solids up to 4.8 mm at 1.5 inch. The model code is ZG25AL-XX-XX-X or ZG40AL-XX-XX, depending on size and material. The data sheet is the source for performance and configuration.

Maximum flow rate	57 LPM at 1/2 and 3/4 inch, 150 LPM at 1 inch, 378 LPM at 1.5 inch
Maximum operating pressure	7 bar at 1/2 and 3/4 inch, 8.4bar at 1 inch and 1.5 inch
Suspended solids max diameter	2.5mm at 1/2 and 3/4 inch, 3.2mm at 1 inch, 4.8mm at 1.5 inch
Air inlet	3/8"BSPT/NPT on the smallest models, 3/4"BSPT/NPT from 1 inch up
Model series code	ZG25AL-XX-XX-X, ZG40AL-XX-XX, ZG25PP(KY)-XX-X

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Key Benefits

What The ZG Series Offers

The ZG series is a mid-range AODD pump with standard air end design and no special features beyond the published performance.

Multiple Body Materials For Fluid Compatibility

Choose aluminum for general duty and low weight, stainless steel for corrosion resistance, or plastic (PP or PVDF) for acids and alkalis. The material is set in the model code.

Standard Air End With No Special Features

The air end is built to standard AODD design. It has no pilot valve, no vacuum chamber, no self-lubricating system, and no anti-icing features. Performance is as published in the data sheet.

No Oiler Required

The pump does not need a lubricator on the air line. The air system is designed to run without oil, so there is no oil mist in the exhaust.

Simple Installation With Standard Ports

The air inlet is 3/8 inch or 3/4 inch BSPT/NPT depending on size. Fluid connections are standard threaded ports. The pump fits into standard skid and pipe layouts.

Runs Dry And Dead Headed Without Damage

Like all AODD pumps, it can be run dry or dead headed against a closed valve. No damage occurs to the pump from these conditions.

Catalogue Data Is The Source

All performance and configuration details come from the published data sheet. The model code is the only way to specify the wetted materials and connection types.

Who It Is For

Who Buys This Pump

The ZG series is used when a mid-range flow and pressure AODD pump is needed, and the fluid does not require special materials or high solids handling.

Chemical and pharmaceutical plants transferring mild acids, alkalis, solvents and water-based liquids
Food and beverage plants handling condiments, syrups and low-viscosity liquids
Machinery and electronics shops moving coolant, cleaning agents and water
OEM builders integrating a mid-flow pump into a skid or system
Maintenance teams doing system flush, recirculation and reclamation tasks

Problems It Solves

Problems This Pump Is Bought To Fix

This pump is chosen when a standard AODD is needed for mid-flow duty, and the plant does not need high pressure, high solids or special materials.

A centrifugal pump loses prime when the tank runs low, while this pump self primes and runs dry without damage
A pump with no solids handling capability fails on grit-laden fluids, while the ZG passes up to 4.8 mm solids at 1.5 inch
A pump with no corrosion resistance fails on acids, while the PP or PVDF body handles mild acids and alkalis
A pump with no material choice fails on fluid compatibility, while the ZG offers aluminum, stainless steel and plastic
A pump with no standard ports requires custom fittings, while the ZG uses standard BSPT/NPT connections

Application Scenarios

Where It Ends Up In A Plant

01

System Flush And Recirculation

The pump runs dry and dead headed, so it can be used to flush lines or circulate fluid through a filter without damage.

02

Batching And Blending Transfer

Air throttling gives smooth flow control from a trickle to 378 LPM, which suits recipe dosing into a mixer.

03

Tank To Tank Transfer

The pump moves liquids between tanks, including those with low levels, because it self primes and runs dry.

04

Coolant And Cleaning Agent Transfer

The pump handles water-based coolants and cleaning agents, with the option to use stainless steel or plastic for corrosion resistance.

Technical Features

How The Air End Is Built

The ZG series uses a standard air operated double diaphragm design with no patented features.

Standard Air End Design
The air end is built to standard AODD principles. It has no pilot valve, no vacuum chamber, no self-lubricating system, and no anti-icing features.
No Special Seals Or Valves
The pump uses standard ceramic or elastomer seals and ball checks. No dual dynamic seals or special valve designs are used.
No Lube Required
The air inlet does not require a lubricator. The system runs dry and clean, with no oil mist in the exhaust.
Standard Connection Types
Fluid connections are threaded in BSPT or NPT. Air inlet is 3/8 inch or 3/4 inch depending on size. No special fittings are used.
No Interchangeable Envelope
The installation envelope is not designed to match other brands. The footprint and port positions are specific to the ZG series.
Selectable Wetted Materials
The body, fluid caps and connections are chosen in the model code. Aluminum, stainless steel or plastic (PP or PVDF) are available.

Specifications

Published Performance

Transcribed from the performance table Nuodean publishes for this model in the series catalogue.

Maximum flow rate	57 LPM at 1/2 and 3/4 inch, 150 LPM at 1 inch, 378 LPM at 1.5 inch
Maximum operating pressure	7 bar at 1/2 and 3/4 inch, 8.4bar at 1 inch and 1.5 inch
Suspended solids max diameter	2.5mm at 1/2 and 3/4 inch, 3.2mm at 1 inch, 4.8mm at 1.5 inch
Air inlet	3/8"BSPT/NPT on the smallest models, 3/4"BSPT/NPT from 1 inch up
Model series code	ZG25AL-XX-XX-X, ZG40AL-XX-XX, ZG25PP(KY)-XX-X

Materials

Material Options

Set in the model code. The data sheet lists available combinations.

Wetted materials	Confirmed against your fluid before build

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.

Quality Control

Before It Is Crated

Every pump is run on air before it leaves, so the shift behaviour is checked rather than assumed
The pump ships with the data sheet and the part list for the fluid and air sections
Ball, seat and diaphragm materials are checked against the ordered model code at assembly
The model code is printed on the pump and in the data sheet

Customization

What You Can Change

Body material: aluminum, stainless steel or plastic (PP or PVDF)
Fluid cap and connection material: aluminum, stainless steel or plastic
Diaphragm material: neoprene, nitrile, Viton, EPDM, PTFE, Santoprene, Hytrel
Ball check material: neoprene, nitrile, Viton, EPDM, PTFE, acetal, polyurethane, stainless steel
Thread type: BSPT or NPT for fluid and air connections
Air inlet size: 3/8 inch or 3/4 inch depending on model

Comparison

Against The Alternatives

Where this pump wins and where you should be buying something else.

Versus the 1 inch triple diaphragm pump	The triple pump gives 133 LPM at 7 bar for high pressure spraying and long lines. The ZG gives 150 LPM at 8.4 bar, but only for standard transfer. Choose the triple pump for pressure, not flow.
Versus the 1.5 inch heavy duty flap-valve pump	The flap-valve pump passes 50 mm solids and handles abrasive slurry. The ZG passes only 4.8 mm solids. Choose the flap-valve pump for large solids, not for general transfer.
Versus the 1.5 inch 2:1 high pressure triple diaphragm pump	The triple pump gives 340.7 LPM at 7 bar for high pressure duty. The ZG gives 378 LPM at 8.4 bar, but only at lower pressure. Choose the triple pump for pressure, not for flow.
Versus the 1.5 inch DP3X aluminum pump	The DP3X gives 647 LPM at 8.3 bar and passes 9.5 mm solids. The ZG gives 378 LPM at 8.4 bar and passes 4.8 mm solids. Choose the DP3X for higher flow and solids handling.
Versus the 1.5 inch non-metallic pump	The non-metallic pump handles acids and alkalis that would attack aluminum. The ZG offers PP and PVDF for similar chemistry. Choose the non-metallic pump only if the fluid is highly aggressive.
Versus a centrifugal pump	The centrifugal is cheaper to run at high flow with clean fluid. The ZG wins when the tank runs dry, the line blocks, the fluid carries solids or the area cannot take a motor.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 378 LPM or less.

Use The Full Air Supply
Flow follows air. Use the full 3/4 inch inlet, keep the hose short and confirm the compressor can hold pressure at the flow the pump asks for.
Do Not Throttle The Suction
Throttle the discharge or the air, never the suction. Starving the suction causes cavitation, hard running and short diaphragm life.
Match The Elastomer To The Fluid
Diaphragm and ball material is chosen in the model code. Get the chemistry right and the pump lasts. Get it wrong and nothing else you do will save it.
Keep Suction Lift Honest
The published flow is at flooded suction. Priming a dry lift is harder, so put the pump below the tank where the layout allows.
Stock The Repair Kit
The fluid section kit, ZG-Flu50, is coded for your diaphragm and ball material. It covers the main wear parts.

Documents

Documents For This Pump

Straight from Nuodean's own literature: series catalogues.

PDF ZG Series AODD PUMP Series Catalogues PDF 13.7 MB Download

Need a 2D or 3D CAD model of this pump? CAD on request via WhatsApp.

Answers

ZG Series Air Operated Double Diaphragm Pump FAQ

What flow will this pump actually give me?

57 LPM at 1/2 inch, 150 LPM at 1 inch, and 378 LPM at 1.5 inch are the maximum values with full air supply and free discharge. Real duty points are lower. Send us the air pressure and discharge head and we will tell you where on the curve you land.

Can it run dry?

Yes. An air operated double diaphragm pump can be run dry and can be dead headed against a closed valve without damage. That is the main reason plants choose one over a centrifugal pump.

What is the largest solid it will pass?

4.8 mm at 1.5 inch, as published in the data sheet. If your fluid carries bigger solids, look at the 1.5 inch heavy duty flap-valve pump at 50 mm.

Will it replace another brand of AODD pump?

Not necessarily. The ZG series is not designed to match other brands' installation dimensions. The footprint and port positions are specific to the ZG series. Send a photo of the nameplate and the pipework and we will confirm if it fits.

Which diaphragm should I order?

PTFE with Santoprene backing for aggressive solvents and acids, Santoprene for general duty and long flex life, Viton for hot oils and aromatics, nitrile for petroleum products. Tell us the fluid and the temperature and we will put the right code on the quotation.

How loud is it?

The sound level is not published. The pump uses a standard air end with no noise reduction features. Slower cycling is quieter, and a piped exhaust takes more off.

What connections does it come with?

Fluid connections are 1/2 inch, 3/4 inch, 1 inch or 1.5 inch BSPT or NPT. Air inlet is 3/8 inch or 3/4 inch BSPT/NPT depending on size. The exact type is in the model code.