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SKU: ZN631/20
Lowara ZN631/20 Stainless Steel Deep Well 6" Submersible Bore Pump (Wet End Only) with Radial Flow Impeller
Australia-Wide
(08) 9240 2992
Official Lowara
Peace of Mind
Product Overview
As a standalone component within the Z6 Series, the Lowara ZN631/20 represents a borehole wet end built for deep well supply. It is essential to pair this standalone pump end with a compatible 26 kW electric motor for deep-well water supply. The physical structure is designed for standard vertical placement inside standard 6-inch casings. It is suitable for pressure boosting and industrial networks and water distribution setups.
To support long-term physical stability during operation, the structural sleeve and discharge head are engineered from cast AISI 316 Stainless Steel. The multi-stage centrifugal hydraulic assembly consists of 20 stages, each incorporating an AISI 316L stainless steel radial impeller. The integrated radial impellers are designed to limit abrasive wear from sand particles, supporting water containing up to 100 g/m³ of suspended sand.
Once paired with its designated 26 kW electric motor (nominal current rating of 54.2 Amps), the coupled assembly achieves up to 287.6 m maximum head. This multi-stage hydraulic wet end generates a maximum flow of 667 L/Min through its Rp 80 mm threaded connection. All performance parameters are in accordance with manufacturer technical specifications.
The pump has a maximum external diameter of 142 mm for installation inside standard 6-inch borehole wells. Maximum pump immersion depth is 300 m when used with C4S motors and 350 m when used with L6W motors. The lower support bracket incorporates a standard 6" NEMA-compliant mount for simple mechanical motor integration. Safe coupling requires correct mechanical alignment of the pump shaft and the motor shaft during mechanical coupling.
FEATURES
- Constructed entirely from AISI 316 Stainless Steel for corrosion protection and structural durability.
- Equipped with 20 multi-stage radial centrifugal impellers manufactured from AISI 316L stainless steel.
- Includes an integrated spring-loaded AISI 316 non-return valve in the discharge head to prevent backflow and maintain system pressure.
- Features a high-strength Duplex Stainless Steel pump shaft and sleeves.
- Equipped with a standard 6" NEMA-compliant motor support bracket and coupling for easy motor integration.
- ErP/Ecodesign compliant with a Minimum Efficiency Index (MEI) of 0.40 or higher, optimizing energy performance.
- Designed with a compact 142 mm maximum external diameter for secure installation inside 6-inch deep well boreholes.
Warranty & Returns
All products supplied by Foundation Pumps are covered by a minimum 12-month warranty unless otherwise stated. Some brands may offer longer manufacturer warranties. Warranty covers manufacturing defects, faulty materials and workmanship under normal use.
- Products must be installed correctly and in accordance with the manufacturer’s instructions.
- Warranty does not cover incorrect installation, misuse, dry running, normal wear and tear, unauthorised repairs or damage caused by external factors.
- Proof of purchase, photos, videos and installation details may be requested when assessing a warranty claim.
- The customer is responsible for returning the product to Foundation Pumps or the nominated service centre unless otherwise agreed.
- Removal, reinstallation, labour and associated site costs are generally the customer’s responsibility unless required under Australian Consumer Law.
- Change-of-mind returns may be accepted within 30 days provided the product is unused, uninstalled and returned in its original packaging.
- Customers are responsible for return freight costs for change-of-mind returns.
- Restocking fees may apply to special-order, bulky or non-stocked products.
- Used, installed or specially ordered products may not be eligible for change-of-mind returns.
- If a product arrives damaged or faulty, please contact Foundation Pumps as soon as possible so we can assist with the appropriate repair, replacement or refund.
Your rights under Australian Consumer Law are not affected.
What dynamic elevation head can this borehole pump achieve when drawing from deep aquifers?
When lifting groundwater from deep subterranean aquifers, the ZN631/20 delivers a maximum dynamic head of approximately 287.6 m, providing reliable water elevation across high vertical pipe columns.
What pipe size connects to the top discharge outlet and what peak flow rate is delivered?
Connecting to your delivery piping requires a standard Rp 3" (80 mm) outlet thread, allowing the ZN631-20 to deliver a peak flow of approximately 667 L/Min while designed to fit inside standard 6-inch borehole installations.
Is this submersible bore pump resistant to corrosion from minerals and particulate wear?
Corrosion defense in harsh underground water sources is provided by AISI 316 stainless steel pump end, AISI 316L stainless steel impellers and diffusers with removable wear rings, Duplex UNS S 31803 shaft, and Duplex UNS S 32304 coupling, allowing the ZN 631 20 to maintain structural integrity while tolerating suspended sand concentrations up to 100 g/m³.
What electrical power and voltage supply are required to operate this submersible pump?
Operating the ZN_631_20 pump end requires coupling to a 6-inch NEMA standard L6W submersible motor rated at 26 kW on a 380–415 V, 50 Hz, three-phase power supply, drawing approximately 54.2 A, with operating water temperatures supported up to 35°C and immersion depth up to 350 meters.
Does this pump include an integrated check valve and can it be mounted horizontally?
Reverse flow protection in the ZN631/20 is provided by an integrated stainless steel non-return valve in the microcast ASTM CF-8M discharge head, while horizontal mounting is supported at a minimum recommended 3° incline with the motor at the lowest position.
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