When it comes to moving large volumes of fluid—including sludge, slurry, oil, chemicals, or wastewater—you need a pump that can keep up with demand without sacrificing reliability. That’s where the 4 inch double diaphragm pump comes in. With high flow capacity and rugged construction, this powerhouse is ideal for the most demanding industrial applications.

What Is a 4 Inch Double Diaphragm Pump?

A double diaphragm pump, also known as an air-operated double diaphragm (AODD) pump, uses compressed air to alternately flex two diaphragms, creating a vacuum to draw fluid in and push it out. The “4 inch” designation refers to the pump’s port size, which allows significantly higher flow rates compared to smaller models.

With 4-inch inlet and outlet ports, this pump is designed for high-volume transfer, often exceeding 1,000 litres per minute depending on the fluid type and setup. It’s an ideal solution when you need to move thick, abrasive, or solid-laden fluids efficiently and safely.

Key Benefits of a 4 Inch AODD Pump

Here’s why industries across Australia trust the 4 inch diaphragm pump:

• Massive Flow Capacity: Designed to move high volumes of fluid fast—perfect for dewatering, tank transfer, and spill recovery.

• Handles Solids with Ease: The large internal clearances and gentle pumping action mean it can handle solids up to several millimetres without clogging.

• Non-Electric Operation: Runs on compressed air, making it explosion-proof and safe in hazardous zones (ATEX-rated versions available).

• Self-Priming & Dry Running: Starts without fluid in the line and can run dry without damage—ideal for fluctuating levels.

• Chemical Resistant Options: Available in aluminium, stainless steel, polypropylene, and other materials to suit your media.

• Portable or Stationary: Can be mounted on skids, trailers, or fixed to plant floors depending on your operation.

Common Uses for 4 Inch Double Diaphragm Pumps

Thanks to their versatility and sheer flow power, these pumps are commonly used in:

• Mining and Quarrying: For dewatering pits, handling tailings, or transferring slurry.

• Oil & Gas: Moving drilling muds, waste oil, or fuel-contaminated water.

• Construction Sites: Pumping dirty water, sludge, and runoff.

• Wastewater Plants: Handling activated sludge, thickened waste, or scum.

• Chemical Industry: Transferring corrosive liquids safely without leaks.

Technical Specs to Look For

When choosing a 4 inch double diaphragm pump, consider the following:

• Flow Rate: Can exceed 1,000–1,200 LPM under optimal conditions.

• Air Consumption: Needs a steady compressed air source—typically between 60–100 PSI.

• Solids Handling: Many models handle up to 12 mm solids, depending on diaphragm and valve type.

• Materials of Construction: Options like aluminium, stainless steel, and PVDF suit different fluids and industries.

• Diaphragm Materials: Choose from PTFE, Santoprene, Buna-N, or EPDM depending on your chemical resistance needs.

• Weight & Mounting: Larger pumps are heavier—portable frames or skid mounts are available for ease of transport and stability.

Maintenance and Operational Tips

• Check air filters and regulators regularly for consistent performance.

• Inspect diaphragms for signs of wear, especially when pumping abrasive fluids.

• Flush the pump after each use to prevent internal build-up or corrosion.

• Keep spare parts like diaphragms, balls, and seats on hand for quick servicing.

Why Choose MultiTorque?

At MultiTorque, we supply, service, and support high-quality 4 inch double diaphragm pumps Australia-wide. With 15+ years of experience in industrial pumps, we know what it takes to keep your systems running—especially in tough environments like mining, construction, and wastewater.

We stock and support trusted global brands such as Wilden, NOV, and Napco, and we also build custom mobile pump solutions, including trailer-mounted AODD pump units for rapid deployment.

Whether you need a pump tomorrow or want expert advice on the right model for your application, MultiTorque has your back.

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Contact us today on 1300 726 525 or email sales@multitorque.com to get the right 4 inch diaphragm pump for your operation.

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