Internal Gear Pumps

Gear pumps use the actions of rotating gears to transfer fluids. The rotation develops a liquid seal with the pump casing and creates suction at the pump inlet. Meaning that Fluid drawn into the pump is enclosed within the cavities of its rotating gears and transferred to the discharge.

ADVANTAGES OF GEAR PUMPS

Gear pumps are unable to match the pressure capabilities of reciprocating pumps or the flow rates of centrifugal pumps but offer higher pressures and throughputs than vane or lobe pumps. Gear pumps are particularly suited for pumping oils and high viscosity fluids.  There are 2 types of rear pump internal and external both offer the same generic advanatges.

• A smooth flow.
• Low flow capabilties.
• Compact footprint.
• Easy maintenance.
• Can handle viscous fluids.
• Can run at low speeds.
• Self priming.
• Low cost.
• Low Shear

WHERE TO USE GEAR PUMPS

Gear pumps are commonly used for pumping high viscosity fluids such as oil, paints, resins or foodstuffs. They are also preferred in applications where accurate dosing or high pressure output is required.

External gear pumps are usually the first choice when it comes to gear pumps due to their simple construction, ease of maintenance, and relatively low cost. How external gear pumps work. 

Internal gear pumps are generally used for high viscosity fluids, high temperature and low NPSH applications. How internal gear pumps work.

Internal Gear pumps:

• All varieties of fuel oil and lube oil
• Resins and Polymers
• Alcohols and solvents
• Asphalt, Bitumen, and Tar
• Polyurethane foam (Isocyanate and polyol)
• Food products such as corn syrup, chocolate, and peanut butter
• Paint, inks, and pigments
• Soaps and surfactants
• Glycol

External Gear pumps:

• Various fuel oils and lube oils
• Chemical additive and polymer metering
• Chemical mixing and blending (double pump)
• Industrial and mobile hydraulic applications (log splitters, lifts, etc.)
• Acids and caustic (stainless steel or composite construction)
• Low volume transfer or application

WHY BUY Internal GEAR PUMPS FROM AXFLOW

• AxFlow offer a wide range of gear pumps including internal and external types, mag driven versions and plastic and alloy wetted materials.
• We are experts in gear pumps having supplied them for over 40 years.
• We have a large team of external and internal pump specialists, and a network of Pump Support Centres spread across the country.

AxFlow UK offers a large range of gear pumps from 3 manufacturers; Envirogear, Pulsafeeder, and Slack & Parr. Gear pumps are often used for high viscous and density applications as they can withstand high levels of pressure.

Internal Gear Pump Maintenance

Maintaining an internal gear pump is important to ensure its efficiency and longevity and can be done in various ways:

• Routine Inspection: Visual inspection of the internal gear pump and its components in order to identify signs of wear, damage, or leaks.

• Oil Change: Change the pump's lubricating oil regularly which may be specified by the manufacturer, whilst using the suggested lubricatiing oil.

• Seal and Gasket Inspection: Inspect seals and gaskets for signs of leaks and wear, and make necessary replacements.

• Check for Vane Wear: Check the condition of the internal gear pump vanes for wear or damage.

• Bearing Lubrication: Lubricate bearings as suggested by the manufacturer to prevent excessive friction and wear.

• Tighten Bolts and Fasteners: Check and tighten any loose bolts, nuts, or fasteners to maintain the pump's structural integrity.

• Flow Verification: Periodically verify the pump's flow rate and performance to ensure it meets your application requirements.

• Cleanliness: Keep the surrounding area clean and free of debris to prevent contaminants from entering the pump.