The Liverani VA Flexible Impeller Pump is a mechanically controlled, low cost variable speed offering. With this option you able to vary the flow capability by means of manually adjusting the output speed on the gear box via a dial. With the VA flexible vane pump series, flow control is not quite as accurate as the INV flexible impeller pump, but offers a decent flow range adjustment. The wheel on the side of the adjuster displays a reference to the rotational speed. 

Flexible impeller pumps are a very versatile in the applications that are suitable for thanks to several design benefits. Firstly, thanks to their supple vanes they are able to handle not only clean, light fluids, but also viscous, solid laden slurries. Secondly, the multiple materials the impellers are made out of mean they are compatible with many fluids e.g. NBR for fats and fuels, EPDM for chemicals and hot fluids and natural rubber for water based liquids. Flexible vane pumps with EPDM and NBR impellers are able to be supplied with FDA Certification, making them a popular electric food grade pump solution. Their low shear operation also makes the ideal for handling delicate fluids that can be altered by other pump designs.

Flexible impeller pumps are renowned for their dry self-priming capability, making them ideal for applications where good suction lift capacity is needed such as the emptying of tanks, sumps and other containers.

NOTE: The required speed must be preset before the flexible impeller pump is started and cannot be adjusted during operation.

For more information on the working principle and typical applications read our flexible impeller pump guide.

Features of the VA Series Flexible Vane Pump:

• Flexible vane pump with mechanically controlled variable speed drive
• Smooth, low pulsing flow for handling shear sensitive liquid
• Solids passage capability - 10mm (MINOR), 15mm (MAJOR), 25mm (MAXI)
• Self priming up to 6m without the need of a non return valve
• Flexible impeller pumps can be run in both directions via a reversing switch mounted onto the panel
• Pump head can be rotated and mounted in several positions
• Wide range of connection types available including DIN, BSP Male & Female, Triclover, SMS, RJT, Friederich, Garolla, and Macron
• Stainless Steel AISI 304 Pipe Fittings for easy integration of the pump into existing applications are available.
• NOTE: units are supplied with Garolla connections as standard with hose fittings, clamps and seals included
• Pump Heads are SS304 as standard. SS 316 available on request
• Unit can be supplied with or without a control panel
• Can be fitted with dry-run protection.
• Automatic drum filling kits are available complete with stainless steel nozzle, non return valve & pressure switch
• Accessories include inverter drive for variable speed operation, dry run protection, pressure switch for automatic pumping, level sensors, remote control & radio operation
• Spring loaded by-pass for the MINOR for manual adjustment of the pump capacity as well as operation with a nozzle

• VA MINOR 40 – 1.5Kw, three phase 230-400v, 50Hz. 900 rpm. Max flow 6200 l/h, max head 24M.
• VA MAJOR 60 – 1.87Kw, three phase 230-400v, 50Hz. 900 rpm. Max flow 19560 l/h, max head 16M.
• VA MAXI 80 – 4Kw, three phase 230-400v, 50Hz. 600 rpm. Max flow 41400 l/h, max head 16M.

Material options for the VA flexible impeller hygienic pump:

** NOTES

1.Changes in Mechanical Seal Materials are at cost. All pumps are supplied with Ceramic / Graphite / NBR as standard.

2.Changes in Impeller Materials are Free of Charge. All pumps are supplied with Natural Rubber Impellers as standard.

3. EPDM and NBR impellers are available with FDA certification.

• Liverani VA Flexible Impeller Pump - Datasheet
• Flexible Impeller Pump Overview Brochure

The beauty of the VA flexible impeller pump is it's versatility. Thanks to the following features it is an option that can be applied to many application requirements. 

• Handles solids up to 25mm – Supple impellers bend to pass viscous fluids and slurries up to 50,000 CP and solids without damage to the pump
• Applies low shear – Ideal for delicate, shear sensitive fluids that can be damaged or altered by other pump types such as cream that gets thicker when whipped.
• Reversible operation – Allows cleaning solution to be ran through after use for hygienic pump applications, and tank to tank transfer applications.
• FDA approved – EPDM and NBR impellers with FDA certification for food grade pump assurance. Stainless sanitary enclosures and Tri-clamp couplings available.
• Smooth, steady pumping – Provides a consistent flow ideal for dosing ingredients, chemicals and process fluids and filling finished product into packaging.
• Self-priming up to 6m – Enables the emptying of tanks and drums without a non-return valve or regular manual priming being required. 
• Various mounting positions - Allows for versatile installation to fit the pipework at hand
• Various accessories available - Trolley for portability, bypass valve for nozzle dispensing, control panel, variable speed drive, level sensors and dry run protection

Flexible impeller pumps are a versatile design of pump for relatively low pressure applications, mainly with thanks to their impellers being produced in a wide range of materials for fluid compatibility including food grade applications. As the impellers are made of a supple, rubber type material that is able to bend, flexible vane pumps are also able to handle viscous fluids and those with solid content without causing damage. They also apply little shear to the pumped medium, making them suitable for shear sensitive fluids and their ability to be operated in reverse makes them ideal for tank to tank transfer. These design benefits make them suited to many applications including: