Flux F 426 Drum Mixer and Transfer Pump

Part numbers available

• 10-42620010
• 10-42620012

Pump type:

• F 426, centrifugal drum mixer and transfer pump with ceramic-oxide mechanical seal
• Ex-classification: Ex II 1/2 G c IIB T4 (stainless steel version only)
• Outer tube material: Polypropylene or Stainless Steel 316
• Driveshaft: Stainless steel or Hastelloy C (PP version)
• Inner tube: Steel-reinforced polypropylene or stainless steel
• Impeller: ETFE axial impeller
• Bearing material: Five heavy duty brass shaft bearings (dry)
• O-rings: FKM (EPDM or FFKM available on request)
• Immersion lengths: 1000 mm (for 200-220 l drums) or 1200 mm (for 1,000 l IBCs), special 1500 mm version available on request. 
• Outer tube diameter: 41 mm (SS), 50 mm (PP)
• Outlet connection: G 1 1/4” A BSPP
• Suitable for use with F 414, F 416 Ex, F 457, F 458-1, F 460-1 Ex and FBM 4000 Ex motors
• Please note that a hose connection is not included and must be purchased separately.

• Max flow rate: Approx. 240 L/min*1
• Max discharge pressure: Approx. 13 mwc*1
• Maximum liquid temperature: 50 degrees C (polypropylene) and 100 degrees C (stainless steel)
• Max density:  Approx. 1.3 g/cm³ with high-power motor
• Max viscosity: Approx. 400 mPas
• Dry run limitations: Not suitable for sustained dry-running
• Solids handling:  Suitable for handling small solid particles in suspension

*Measured with water at 20 degrees C in open flow condition. The maximum figures listed above are dependent on the application, fluid properties and the pump configuration. Please refer to technical data sheets or performance diagrams.

**dependent on pump type, diameter and motor.

Please see our comprehensive list of media examples suitable for the F 426, based on pump material, here. 

Combination of mixing and transfer within one pump

When product homogeneity and uniformity is critical, the Flux F 426 drum mixer delivers an unparalleled combination of mixing and transfer functionality. This is done within a single, precision-engineered pump.

Importantly, the F 426 eliminates the requirement for a standalone agitator or recirculation system, along with a separate pump. Therefore, reducing capital expenditure, maintenance complexity and additionally potential contamination points.

The F 426 is ideal for handling low viscosity, low density, non-adhesive media that are prone to phase separation. Alternatively, it is suitable for liquids that require consistent agitation during transfer. For example, re-suspending solids in coating materials and homogenising reagents in pharmaceutical, or fine chemical manufacturing.

Moreover, these operations traditionally require separate mixing and pumping equipment, creating bottlenecks and requiring repeated manual handling.

Centrifugal impeller

The F 426 is a high-shear mixer with a 38 mm diameter centrifugal impeller. The impeller spins at speeds up to 10,000 RPM, driving the liquid up the pump tube and out through the mixing ports. Continued operation thereby re-circulates the media repeatedly in the drum or IBC.

Note, however, that F 426 is not suitable for use with shear-sensitive, highly foaming, high density or high viscosity liquids.

The user selects mixing or pumping functionality using adjustable levers at the top of the pump tube. The levers open and close four re-circulation ports in the outer pump tube, consequently redirecting flow from the pump impeller.

Mode selection may be undertaken with the motor running. Thus providing seamless changeover between pumping, simultaneous pumping and mixing, or recirculation modes, without interrupting the process.

Furthermore, these pumps are available in either corrosion-resistant polypropylene or stainless steel 316 materials. The polypropylene version features the unique Flux high-strength steel-reinforced inner tube, for ultimate vibration resistance and structural integrity. 

To conclude, the F 426 is a flexible, lightweight, cost-effective solution for occasional low viscosity drum mixing applications when a dedicated mixer is impractical.