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SKU: 4ZN631/4
Lowara 4ZN631/4 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
The Lowara 4ZN631/4 is engineered as a standalone submersible wet end, belonging to the borehole water extraction line of the Z6 Series. Operating this wet end requires secure coupling with a compatible 5.5 kW electric motor of the appropriate power rating. Designed for secure installation inside standard 6-inch deep wells, the assembly operates inside standard casings. It is suitable for groundwater supply and irrigation systems, municipal supply lines, and agricultural distribution projects.
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 4 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 5.5 kW electric motor (nominal current rating of 12.6 Amps), the coupled assembly achieves up to 57.9 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 4" 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 4 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 4" 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.
Does this borehole extraction pump provide reliable corrosion and grit defense?
Subterranean chemical resistance is reinforced 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 throughout the 4ZN631/4, which tolerates abrasive sand content up to 100 g/m³.
Which electrical voltage and kilowatt power are specified to operate this borehole pump?
Running the 4ZN631-4 assembly relies on a 4-inch NEMA C4S motor rated at 5.5 kW powered by 380–415 V, 50 Hz, three-phase drawing 12.6 A, handling fluids up to 60°C and submersion up to 300 meters.
Is a check valve built into the delivery head and can this pump be mounted horizontally?
An integrated stainless steel non-return valve in the microcast head of the 4 ZN 631 4 prevents line drainage, and horizontal positioning is supported at a minimum recommended 3° incline with the motor lowest.
How high can this deep well pump lift water when discharging up to surface tanks?
Water raising from deep borehole installations is led by the 4_ZN_631_4, which provides a maximum dynamic head of approximately 57.9 m.
What size plumbing pipe attaches to the top head and what is the maximum flow rate?
Surface piping connects directly to the Rp 3" (80 mm) delivery outlet, where the 4ZN631/4 maintains a maximum flow rate of approximately 667 L/Min in standard 6-inch borehole installations.
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