LUTZ 5723-020 1-1/2″ SST Metal Diaphragm Pump

LUTZ 5723-020 1-1/2″ Stainless Steel Metal Diaphragm Pump

The LUTZ 5723-020 is an air-operated double diaphragm (AODD) pump designed for demanding industrial and marine fluid transfer applications and constructed with a rugged stainless steel metal housing. This positive displacement pump is designed for aggressive, corrosive and viscous media without stalling, and provides a hermetically sealed lubrication-free air control valve system for maximum operational reliability and energy efficiency. As a Refurbished unit, it has been through rigorous testing, seal replacement and calibration to return it to factory spec performance, providing you with heavy-duty reliability at a fraction of OEM lead times.

Model Details

• Manufacturer: Lutz Pumpen GmbH
• Series: Air-Operated Double Diaphragm (AODD) Metal Line
• MPN (Manufacturer Part Number): 5723-020
• Pump Size: 1 1/2 inch (1.5″)

Technical Details: LUTZ 5723-020

Main Features

1. Corrosion Resistant Stainless Steel Construction: High grade metal wetted parts offer excellent resistance to aggressive acids, solvents, sea water and chemical slurries.
2. Stall-Free Air Valve Technology: A precision-engineered, non-icing, lubrication-free air control system that prevents center-block freezing and mechanical binding.
3. Self-Priming & Dry-Running Capabilities – Can safely undertake dry suction lifts of up to 4.5 meters without harm to internal components.
4. Variable Flow & Pressure Control Easy adjustment of output head and delivery speed by simply varying the pressure of the external compressed air supply line.
5. Shear Sensitive Fluid Transfer: Gentle, low-pulsation oscillating displacement pattern preserves the structural integrity of viscous and shear sensitive media.

Applications

• Marine and offshore ballast transfer, bilge stripping, and tank cleaning operations.
• Chemical processing plants handling aggressive solvents, acids, and caustic alkalis.
• Paint, ink, and coating manufacturing facilities requiring consistent fluid recirculation and feed.
• Wastewater treatment plants moving sludge, flocculants, and chemical dosing agents.
• General industrial fluid transfer across petrochemical, pulp, and manufacturing sectors.

Compatibility

• Fully compatible with standard industrial compressed air distribution networks (regulated up to 8 bar).
• Matches standard 1 1/2-inch rigid piping and flexible industrial hose assemblies.
• Interchangeable with legacy Lutz 1.5″ metal AODD installation footprints and mounting brackets.

Part Number Cross-References

• OEM Cross-References: Lutz 5723020, AODD 1.5″ SST, Part No. 5723-020-REF
• Manual & Datasheet Availability: Comprehensive installation, maintenance, and pneumatic circuit schematics can be accessed via the official Lutz AODD technical documentation portal or requested directly through our engineering desk.

Marine Engineer Expert’s Guide

Engineer’s Note: When commissioning metal AODD pumps like the LUTZ 5723-020 in a marine or heavy industrial environment, always ensure an air line filter-regulator-lubricator (FRL) unit is installed upstream—even though the air valve is “oil-free,” keeping moisture out of the pneumatic shuttle extends pilot life exponentially.

1. Cavitation Prevention: Ensure the suction line diameter is at least equal to or greater than the pump’s 1-inch inlet port. Restricting the suction side causes starvations, vapor lock, and accelerated diaphragm fatigue.
2. Cold Starts: If operating in sub-zero deck conditions, monitor exhaust icing. While Lutz uses low-friction composite spools to mitigate this, dropping line air pressure slightly or utilizing an air dryer will guarantee continuous duty cycles.

Frequently Asked Questions

What media can the LUTZ 5723-020 stainless steel pump handle?

The stainless steel wetted architecture makes this pump ideal for aggressive chemicals, thin acids, organic solvents, industrial wastewater, paints, and sea water. Always verify elastomer compatibility if handling specialized hydrocarbons.

What does “Seller Refurbished” mean for this unit?

The pump has been completely torn down, inspected for wear, cleaned, fitted with fresh seals/diaphragms where required, reassembled, and hydro-pneumatically bench-tested to confirm it meets original factory flow and pressure output parameters.

Can this pump run dry safely?

Yes. Like all high-grade AODD pumps, the Lutz 5723-020 can run dry indefinitely without generating damaging frictional heat or destroying internal volutes.

What is the maximum operating air pressure?

The maximum allowable air supply pressure is 8.0 bar (116 PSI). Operating beyond this limit can compromise the structural integrity of the center block and manifold assembly.