Liverani INV Flexible Impeller Pump

The Liverani INV Flexible Impeller Pump is an inverter controlled, variable speed drive solution. This is the most efficient and accurate method of variable speed offering as you are able to infinitely vary the flow capability, by means of adjusting the frequency of the electric motor between its minimum and max speeds. 

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.

By using a flexible vane pump with gear box with twin output shafts, double headed options are available to generate either larger flow rates or higher heads. The INV MAXI DOUBLE 2Q effectively doubles the flow of the INV MAXI 80, whereas the INV MAXI DOUBLE 2H effectively doubles the head.

The standard build is supplied with the INV flexible impeller pump mounted on the trolley and supplied with a CE Control Panel with mounted inverter and a remote on a 15 m cable (On / Off / Reverse & Speed Adjustment). Optional extras include:

1. Bi-directional radio controller instead of a wired unit which is water proof and can work up to a 100 m distance and is supplied with a charging station.
2. Supplementary 4-20 mA Connector
3. Timing System

Read our flexible vane pump guide for more information on how this pump works and the applications it is commonly used for. 

Features of the INV Series Flexible Vane Pump:

• Pulsation free pumping action ensures easy pumping of shear sensitive liquids.
• Solids passage capability - 3mm (MINI), 5mm (MIDEX), 10mm (MINOR), 15mm (MAJOR), 25mm (MAXI)
• Dry self priming up to 6m without the need of a non return valve.
• Pumps can be operated in both directions through a reversing switch mounted on 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 if required.
• Pump heads are fitted with dry-run protection devices and a supplementary 24V NC contactor for wiring in any external control devices such as flow meters, pressure switches or transducers
• CE Control Panel with mounted inverter and a remote on a 15 m cable (On / Off / Reverse & Speed Adjustment).
• Manual by-passes (MINI, MAJOR & MAXI) for manual adjustment of the pump capacity available.
• Spring loaded by-pass for the MIDEX & MINOR for manual adjustment of the capacity and use with a nozzle.
• 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. 

• INV MINI ¾” – 0.56Kw, 1-3 phase 230-400v, 50Hz. 1400 rpm. Max flow 1440 l/h, max head 27M.
• INV MIDEX 1” ¼ - 0.75Kw, 1-3 phase 230-400v, 50Hz. 1400 rpm. Max flow 5160 l/h, max head 27M.
• INV MINOR 40 – 1.87Kw, 1-3 phase 230-400v, 50Hz. 900 rpm. Max flow 6200 l/h, max head 24M.
• INV MAJOR 60 – 2.2Kw, 1-3 phase 230-400v, 50Hz. 900 rpm. Max flow 19560 l/h, max head 16M.
• INV MAXI 80 – 4Kw, 3 phase 230-400v, 50Hz. 600 rpm. Max flow 41400 l/h, max head 16M.
• INV MAXI Double 2Q – 5.5Kw, 3 phase 230-400v, 50Hz. 470 rpm. Max flow 65000 l/h, max head 18M.
• INV MAXI Double 2H - 5.5Kw, 3 phase 230-400v, 50Hz. 470 rpm. Max flow 35000 l/h, max head 32M.

Material options for the IBC flexible impeller sanitary 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 INV Flexible Impeller Pump - Datasheet
• Flexible Impeller Pump Overview Brochure

Diesel Tank to Tank Transfer for Generator Supplier - Flexible Impeller Pump

When a customer enquires about a pumping system, there is usually a list of specifications that need to be met. Thanks to our team's knowledge and experience, Castle Pumps were able to fulfill our customer's exact requirements. We designed, built and supplied a ready to use system, which cut the customers extraction process time to under two hours.

The beauty of the INV 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: