Flexible Impeller Pumps

Self-Priming Flexible Impeller Pumps

Self-Priming Flexible Impeller Pumps, also known as flexible vane pumps, are a form of positive displacement pump. They move fluid from the suction port to the discharge port by trapping an amount of fluid between its impeller vanes and then forcing it round towards the outlet. Their design enables them to handle thin and viscous (up to 50’000 cPs) fluids as well as solids in suspension (up to 25 mm). They are capable of discharges pressures up to 4 bar and flow rates up to 1200 l/min & maximum fluid temperatures up to 120ºC.

A wide range of voltages are also available: 12V, 24V, 110V, 230V, 400V

Connections are available from ¾” to 3” in a variety of types to suit customer requirements

Thanks to their easy mounting principle & the extensive choices of materials and executions, Self-Priming Flexible Impeller Pumps are a versatile and customisable product suitable for use in many applications and industries. Every pump can be supplied with different impeller & sealing materials, connection types and sizes, as well as with or without control panels and remote controls. A wide range of accessories are also available upon request such as batching systems, timers & hygienic shrouds.

Self-Priming Flexible Impeller Pumps are particularly suitable for transferring delicate, fragile (shear sensitive) and viscous fluids, also with solid parts in suspension.

They are typically used in the following industries:

Oenological: wines, musts, must and stemmed grapes
Food: beer, fruit pulp and juice, honey, liquid sugar, syrups, glucose, milk, melted butter, yoghurt, liquid eggs, oil, tomatoes pulp and juice, brine, etc…
Chemical: starch, water based glues, emulsions, glycerine, wax, detergents, rubber latex, photographic processing liquids, polyelectrolyte, paints, ink, industrial discharges, etc…
Cosmetic & Pharmaceutical: liquid soap, cleaning lotion, cream, shampoo, etc…

Operating Principles and Benefits

The vanes of the impeller deform slightly when rotating inside the pump casing, moving the fluid from the inlet to the outlet at a steady, pulseless flow without pressure spikes. This principle combined with a gentle pumping action and a high self-priming capability, up to 6 m from dry, makes these units ideal for transfer, filling, dosing and filtration applications. Thanks to the intrinsic simplicity and versatility of their design Self-Priming Flexible Impeller Pumps have many features and benefits which make them ideally suited to a plethora of applications.

Extremely good self-priming ability: They are capable of dry suction lifts up to 6 m from dry. Enabling the evacuation of sumps, tanks, drums & IBCs without the need for a non-return valve or manual priming on installation.

Reversible operation: Can operate bi-directionally, which allows for the return of any excess fluid & emptying of pipes at the flip of a switch located on the terminal box of the motor. This is particularly useful when emptying tanks for cleaning purposes and refilling upon completion.

Solids & Viscous Product Handling: Can handle soft and fragile particles in suspension as well as viscosities up to 50’000 cPs, at low operational speeds. The pump will pass the solids without causing any damage to them, air locking or emulsifying the product. This makes these pumps particularly suitable for shear sensitive products.

Solids Passage Capability:

Mini: 3 mm
Midex: 5 mm
Minor: 10 mm
Major: 15 mm
Maxi: 25 mm

Pulse-free pumping action: Can be used for filling, dosing or filtration applications. The Midex and Minor ranges can be fitted with spring loaded by-passes and others fitted with manual by-passes to facilitate operation with nozzles or valves to protect against dead heading.

Pump Head can be rotated into 5 positions: Enables installation into various pipework configurations. The motor can also be mounted above or below the pump head, thus enabling the customer to make the pump work for the system.

Different Executions

Execution Description
S/P Bareshaft & PTO Driven
MID Hydraulically Driven
EP Close Coupled
GR Belt Driven
RID Geared Motor
VA Mechanical Speed Variation
INV Inverter Controlled on Trolley with Control Panel, Dry Run Protection & Remote
INV BS Inverter Controlled on a Trolley with Forced Motor Ventilation
MINIVERTER Inverter Controller integrated into Terminal Box

Self Priming Flexible Impeller Pumps Connection Types & Sizes

Standard Control Panel Details


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  1. Bare Shaft and Hydraulically Driven

    Our Bare Shaft and Hydraulically Driven Pumps are commonly used for loading and offloading applications in agricultural and transportation industries on vehicles such as trucks, tractors & boats.

    The S/P Series can be connected with a PTO drive or can be assembled to an existing motor and baseplate via a coupling. The MID series, on the other hand, can be fitted with Orbital Hydraulic Motors (50 CC) or with coupling suitable for attachment to an existing hydraulic drive system.

    Manual & Spring Loaded By-Passes are available on request.

    Learn More
    Contact Us for Pricing

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