V-NOX 400 – quiet vertical multistage pump

Flow rate up to 21 m³/h (350 l/min), head 13–76 m, motor 1.5–4 kW. AISI 304 stainless steel, extremely quiet operation. Available in single-phase 230 V and three-phase 400 V versions.

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Product description

V-NOX 400 is the more powerful model in the V-NOX range, with a flow rate of up to 21 m³/h (350 l/min)—almost twice that of the V-NOX 300. Five configurations with 3 to 7 stages cover delivery heads from 13 m to 76 m.

With 1 1/2" suction / 1 1/4" discharge threaded connections and extremely quiet operation, the V-NOX 400 is designed for larger apartment buildings, hotels and commercial premises with higher water demand. The 403 M/T version is single-phase 230 V; the other versions are three-phase 400 V.

The impellers and pump casing are made of AISI 304 stainless steel, the shaft of AISI 431, and the diffusers of fiberglass-reinforced technopolymer. Mechanical seal: graphite/ceramic / AISI 304. Counterflanges and seals are included.

Main technical specifications

ParameterValue
Model rangeV-NOX (SACI pumps)
Configurations (versions)403, 404, 405, 406, 407
Suction / discharge connection1 1/2" / 1 1/4" thread
Flow rate range Q0–21 m³/h (0–350 l/min)
Head range H13–76 m (depending on the number of stages)
Motor power P21,5–4 kW (2–5,5 HP)
Power supply230 V 1-phase (403 M/T) · 400 V 3-phase (404–407 T)
Speed2 850 rpm
Pumped liquid temperatureup to 45 °C
Max. ambient temperature45 °C
Motor protection ratingIP-55
Insulation classF (155 °C)
DutyS1 (continuous)
Impeller and casing materialAISI 304 stainless steel
Shaft materialAISI 431
Diffuser materialGFN-2 technopolymer (glass fiber)
Mechanical sealgraphite/ceramic / AISI 304
Lower guide bushbronze
Counterflangesincluded
Suitable for drinking wateryes (AISI 304)

Versions and dimensions

VersionStagesMotor kWPower supplyA mmB mmC mmD mm
V-NOX 403 M/T31,5230 V38207245512
V-NOX 404 T42,2400 V38247285569
V-NOX 405 T53400 V38287325647
V-NOX 406 T63400 V38326364686
V-NOX 407 T74400 V38365403725

Q-H performance curve

VersionQ=01,534,56912151821
4033534,5343331,527231813–
404444342413732,5272114–
40555545351,5484337292114
4066664,563615651433423–
4077675736760514128––

(Q in m³/h, H in metres of water column)

The standard maximum operating head and maximum operating flow rate are highlighted on the chart with a solid line.

Applications

  • Pressure boosting systems in larger apartment buildings – extremely quiet operation and higher flow rates for multiple residential units.
  • Hotels and guesthouses – reliable water supply without noticeable noise.
  • Hospitals and care homes – quiet operation in noise-sensitive environments.
  • Commercial buildings – offices, shopping centres, restaurants.
  • Fire protection systems – as a jockey pump to maintain pressure in fire suppression system piping.
  • Small industrial facilities – where flow rates of up to 21 m³/h are sufficient and noise levels matter.

Key benefits

  • Extremely quiet operation – technopolymer diffusers dampen vibrations better than an all-metal design.
  • Flow rate of up to 21 m³/h – almost twice that of the V-NOX 300, for larger buildings.
  • Counter-flanges and gaskets included – nothing else to purchase.
  • Compact dimensions – width 38 mm (dimension A).
  • 5 configurations – from 403 (1,5 kW) to 407 (4 kW).
  • AISI 304 hydraulics – suitable for drinking water and built to last.

Optional accessories

  • O-rings: POWERseal EPDM
  • Replacement mechanical seal: graphite / ceramic / AISI 304
  • Variable frequency drive 1,5–4 kW, depending on the variant

What is the difference between the V-NOX 300 and the V-NOX 400?

The V-NOX 400 has a higher flow rate (21 m³/h vs 11 m³/h), but a lower maximum head (76 m vs 124 m). For high-rise buildings with lower demand, choose the V-NOX 300 (higher head). For larger buildings requiring a higher flow rate and lower head, choose the V-NOX 400.

Is the V-NOX 400 available in a 230 V single-phase version?

Yes, the V-NOX 403 M/T variant (3 stages, 1,5 kW) is single-phase, 230 V. Variants 404–407 are three-phase, 400 V only.

Are counter-flanges included?

Yes, counter-flanges and gaskets are included as standard with all V-NOX variants.

When should I choose the XV-F instead of the V-NOX 400?

If you need a flow rate above 21 m³/h, a fluid temperature above 45 °C, a flanged connection or a higher operating pressure. The XV-F 15 (DN 50, up to 22 m³/h) is the closest industrial alternative.

What is the warranty?

V-NOX pumps come with a 24-month warranty.

Features

Feature Value Unit
DNA = input / suction
40 DN
DNM = output / displacement
32 DN
Flow rate Q
0 to 21 m³/h
Displacement range H
13 to 76 m
Temperature of the pumped medium
0 to 45 °C

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Flow rate up to 11 m³/h (183 l/min), head 8–124 m, motor 0,9–4 kW. AISI 304 stainless steel, extremely quiet operation. Single-phase 230 V and three-phase 400 V.

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