Rotary Vane Pumps

Rotary vane pumps are positive displacement pumps designed for reliable transfer of fuels, oils, LPG, solvents, chemicals and other low-to-high viscosity liquids.

AxFlow UK supplies industrial sliding vane pumps for applications requiring self-priming capability, predictable flow, suction lift, line stripping or efficient transfer across changing system pressures.

Our range includes general industrial vane pumps, LPG transfer pumps, stainless-steel and corrosion-resistant models, magnetic-drive pumps and specialist designs for demanding process applications.

What are Rotary Vane pumps

A rotary vane pump is a rotary positive displacement pump that moves a defined volume of liquid between an eccentric rotor, sliding vanes and the pump casing. As the rotor turns, the vanes move outward to maintain contact with the pumping chamber. Expanding cavities on the suction side draw liquid into the pump, while decreasing cavities on the discharge side push it out.

Because a defined volume is displaced during each revolution, flow is primarily related to pump speed rather than system pressure.

How does a sliding vane pump work?

A sliding vane pump operates through four basic stages:

1. The rotor turns inside an eccentric pumping chamber.
2. Vanes move outward from slots in the rotor and maintain contact with the chamber wall.
3. Increasing space between adjacent vanes creates suction and draws liquid into the pump.
4. The trapped liquid travels around the casing until the decreasing chamber volume forces it through the discharge.

In many sliding-vane designs, the vanes automatically move outward as they wear. This can help maintain volumetric performance throughout the service life of the vanes.

Current Blackmer sliding-vane designs use centrifugal force, push rods and liquid pressure, depending on model, to maintain vane contact with the pumping chamber.

Vane pump Applications

Rotary vane pumps are used in many different applications due to their all-round versatility. Typical applications include fluids that display varying levels of viscosity, have high or low temperature levels, are non-lubricating or could be made from ingredients that can be aggressive and cause damage to the pump.

When it comes to light, non-lubricating fluids such as alcohols and solvents then vane pumps are very often the best solution as they are self-lubricating and can (with the correct design) cope with low net positive suction head (NPSH).

Why choose a rotary vane pump?

Rotary vane pumps can provide an effective combination of positive-displacement performance and relatively simple maintenance.

Depending on the selected design, advantages can include:

• Strong self-priming capability
• Good suction-lift performance
• Predictable flow as pressure changes
• Low-pulsation liquid transfer
• Efficient handling of thin liquids
• Ability to handle a wide viscosity range
• Gentle, relatively low-shear pumping
• Short-period or extended dry-running capability on appropriate designs
• Reversible operation on suitable models
• Line stripping and product recovery
• Replaceable wear components
• Good efficiency across variable system pressures

Sliding-vane technology is particularly attractive where self-priming, suction performance and consistent transfer flow are important.

CHOOSING THE RIGHT vane PUMP

When it comes to selecting a pumping system, the choice commonly comes down to rotary positive displacement and centrifugal types, as both types can often be used for the same applications.

By virtue of their inherent energy and mechanically efficient designs, positive displacement rotary and sliding vane pumps are perfectly suited to offering operators immediate high value advantages and solutions in fulfilling their energy saving initiatives. In reviewing a list of the most common system characteristics that need to be considered in pumping applications, positive displacement pumps outperform centrifugal pumps is almost all of them.

If you have a relatively low flow and a relatively high-pressure requirement, or if you require the pump to be self-priming, then a vane pump will often be the best solution.

When selecting a rotary vane pump you should, among other things, consider whether it should be:

• Using alternating or direct current
• Oil-sealed or dry

Do you need help choosing the right pump for your industry and needs? Get in touch, our team of knowledgeable experts would be happy to advise you!

BENEFITS OF ROTARY VANE PUMPS

Rotary vane pumps deliver a gentle low shear action so that the structure of the pumped fluid is not affected.

By virtue of their inherent energy and mechanically efficient designs, positive displacement rotary and sliding vane pumps are perfectly suited to offering operators immediate high value advantages and solutions in fulfilling their energy saving initiatives. In reviewing a list of the most common system characteristics that need to be considered in pumping applications, positive displacement pumps outperform centrifugal pumps is almost all of them.

Depending on the technology chosen, rotary vane pumps may offer:

• Ability to self-prime.
• Constant flow that is relatively independent of changes in system pressure.
• Constant flow that is relatively independent of changes in viscosity.
• Ability to handle low and medium viscosity products.
• Can handle thin liquids at relatively higher pressures.
• Develop a good vacuum.
• Ability to run dry for short periods.
• Higher efficiency across varying system pressures.

WHERE TO USE ROTARY VANE PUMPS

Rotary vane pumps are used in many different applications due to their all-round versatility. They can deliver flows up to 450 m3/hr and differential pressures of 14 bar.  They are typically found in dispensing applications, transferring fuels, low flow circulation duties and some specialist applications such as pumping chocolate.

Rotary Vane pumps are also commonly used for pumping viscous fluids such as oils and syrups, as well as this Vane pumps can are excellent at handling a variety of solvents such acetone. When it comes to light, non-lubricating fluids such as alcohols and solvents then vane pumps are very often the best solution as they are self-lubricating and can (with the correct design) cope with low net positive suction head (NPSH).

Which rotary vane pump should I choose?

The correct configuration depends heavily on the liquid and suction conditions.

Rotary Vane Pump Maintenance

Proper rotary vane pump maintenance is essential to maintain volumetric efficiency, prevent vane wear, and ensure reliable operation in industrial and process applications. As positive displacement pumps, rotary vane pumps rely on precise internal clearances and vane condition for consistent performance.

Key Maintenance Practices

• Inspect vanes for wear, cracking, or loss of length; replace worn vanes to maintain sealing and efficiency
• Monitor lubrication oil level and quality in oil-lubricated designs
• Check seals, shaft seals, and gaskets for leakage
• Monitor noise, vibration, and flow stability, which may indicate vane or bearing wear
• Keep suction lines clean and airtight to maintain adequate NPSH and prevent cavitation

Planned Maintenance

• Replace vanes and seals at scheduled intervals
• Flush the pump to remove deposits or contaminants
• Verify pump-to-motor alignment after maintenance

Rotary Vane Pump Service & Repair

We provide inspection, vane replacement, repair, and refurbishment services for rotary vane pumps across chemical, industrial, and process applications.

WHY BUY ROTARY VANE PUMPS FROM AXFLOW

AxFlow UK has been supplying rotary vane pumps for over 50 years as a result we are one of the leading experts when it comes to rotary vane pumps in the UK.

AxFlow offers 10 different ranges of vane pumps from three manufacturers; Blackmer,  Gruppo Aturia,  and Mouvex giving us the widest selection of vane pumps in the UK. Our range of vane pumps includes cast iron and stainless steel models, mag drive options, vane pumps designed for low viscosity liquids such as LPG, API 676 and pulseless pumps.