Liverani EP MAJOR Flexible Impeller Pump
Viscous Fluids & Food Grade Pump
| Key Specifications | |
|---|---|
| Max Flow Rate | 326lpm |
| Max Head | 16M |
| Max Temperature | 100°C |
| Max Viscosity | 50,000 cP |
| Solids | 15mm |
| Size | 2" to 2 1/2" |
The Liverani EP MAJOR range of close coupled stainless steel flexible impeller pumps are a popular choice due to their compact and cost-effective design. The operation of these pumps is similar to the centrifugal design, but as the impeller vanes are a flexible polymer they bend as they force the liquid through.
Flexible impeller pumps are very versatile in applications that are suitable for thanks to several design benefits. Firstly, thanks to their supple vanes Liverani EP MAJOR flexible vane pumps are able to handle not only clean, light fluids, but also vicious, 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. Liverani pumps with EPDM and NBR impellers are able to be supplied with FDA Certification, making them a popular food grade pump solution. Their low shear operation also makes these flexible vane pumps ideal for handling delicate fluids that can be altered by other pump designs.
Liverani EP 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. The flexible vane pumps are widely used in transferring, filling & emptying applications, but when used in conjunction with a carrying handle and their integral on/off reversing switch they are also a very reliable utility pump solution popular for tank to tank transfer.
Available here is more information on the working principle and typical applications of the flexible impeller pump.
Features of the EP MAJOR Series Flexible Vane Pump:
- Close coupled flexible impeller pump
- Smooth, non pulsating flow allows the efficient handling of shear sensitive liquids.
- Solids passage capability - 15mm
- Self priming up to 6m without the need of a non return valve.
- Flexible vane pumps can be run in both directions via a reversing switch mounted on the pump.
- Select models are available with 2 speed operation, controllable via a rocker switch on the terminal box.
- Pump head can be rotated and mounted in several positions.
- Motor supply options 12, 24, 230 & 400V
- Wide range of impeller materials compatible with a multitude of fluids: Food grade NBR / Neoprene / Food grade EPDM / Natural Rubber / Silicon
- 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
- Pump is available with the connections facing in the position required (V, 90D, 90S).
- Pump heads are SS304 as standard for MINOR, MAJOR & MAXI. SS 316 on request.
- Connections are Garolla as standard for MINOR, MAJOR & MAXI. Others on request.
- Manual by-passes (MINI, MAJOR & MAXI) for manual adjustment of the pump capacity are available.
- Automatic barrel filling kits with stainless steel nozzle, non return valve & pressure switch can be supplied for barrel or container filling applications.
- Accessories available include inverter drive for variable speed operation, dry run protection, pressure switch for automatic pumping, level sensors, remote control & radio operation.
- Stainless steel sanitary pump enclosures are available on request for food safe applications
- Spring loaded by-pass for the MINOR for manual adjustment of the flexible impeller pump capacity as well as operation with a nozzle.
NOTE: Mini & Midex units are supplied with BSP M connections as standard, MINOR, MAJOR & MAXI units are supplied with Garolla connections as standard with hose fittings, clamps and seals included.
The beauty of the EP 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:
| Marine Applications | Industrial Applications |
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Material options for the EP flexible impeller hygienic pump:
| Description | Stainless Steel AISI 304 | Stainless Steel AISI 316 | Nitrile (NBR) | Natural Rubber (NR) | Neoprene (CR) | EPDM | Silicon (VMQ) | St. St. / Graphite / NBR | Tungsten Carbide / NBR | Tungsten Carbide / Viton |
| Part List | ||||||||||
| Pump Body | X | X | ||||||||
| Impeller | X | X | X | X | X | |||||
| Mechanical Seal | X | X | X |
** 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
Beer Transfer at Brewery - Hygienic Flexible Impeller Pump
We received an enquiry from this brewery company in Scotland who required a portable hygienic pump for the transfer of beer within their factory. We decided the best option would be a food grade flexible impeller pump with tri-clamp connections in order to meet the necessary standards within the food industry. The customer was that happy with their pump that they sent us some beers to show us what the pump would be helping to produce.
Ready to Drink Cocktail Producer – Flexible Impeller Pumps
We were approached by a manufacturer of ready to drink cocktails looking for pumps for the transfer of various fluids used within the recipes, as well as the finished product. The initial enquiry was just for two pumps, which they wanted to trial to see if it was worth upgrading all of their existing alcohol transfer pumps on site used for handling their drink products. After 6 months of excellent service, they returned with an enquiry for another 7 of the same pumps plus another pump for transferring 55% proof alcohol.
FAQs
Flexible impeller pumps are part of the positive displacement pump family. They consist of a rotating rubber impeller with supple vanes attached. As the casing is smaller than the vanes, they must bend and then straighten as the impeller turns to conform to shape of the pump internal walls. The vacuum created push the fluid round from the inlet to the outlet.
Ensuring compatibility with the fluid being pumped is a vital part of flexible impeller pump specification to avoid swelling, erosion and even melting of the impellers. Our Liverani impellers are available in Natural Rubber, Neoprene, NBR, EPDM and Silicon. Upon disclosure of the fluid you are handling we will establish the best solution. Or view our chemical compatibility table here.
| Yes. The pump is constructed of a 316 Stainless Steel pump head and the impellers are available in food grade NBR or EPDM. They can also be supplied with food safe Tri-clamp fittings to meet ISO 2852 and with Stainless Steel motor enclosure on request. |
Unfortunately not! The fluid acts as a lubricant and coolant as the pump runs, so as well as risking the impeller melting, the mechanical seal could crack and result in leaking if it overheats. Consider a dry run protection device or float switch if there is risk of this happening.
Flexible impeller pumps are a relatively low cost solution compared to other pumps able to handle aggressive fluids, solids and viscous liquids. They are however limited in their pressure capabilities, so are usually reserved for more steady duty requirements.
Yes. Being able to operate in both directions makes flexible impeller pumps ideal for tank to tank transfer as well as returning excess liquid out of the pipework when transfer is complete.
Yes. The impellers are made of a supple rubber type material able to bend around soft solids without damage or jamming.
Yes! Thanks to the nature of the flexible vanes meaning that they maintain a tight seal with the internal pump walls they are ideal for where suction lift is required.
To ensure you get the correct Liverani pump spares, we need to identify the exact pump model you have. Please advise us of the model number and serial number (referred to as Commessa) which can be found on the pump label which is usually on the top of the pump body.
Castle Pumps can supply all Liverani pump parts detailed on the spare parts list including impellers, mechanical seals, casing and o-rings.
Liverani pumps are available with additional accessories including inverters for variable speed, trolley for portability, level sensors, control panel, remote control operation and bypass valve for nozzle dispensing.
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- Max Temperature: 100°C
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- Max Temperature: 100°C
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