Invented in around 1600, gear pumps are commonly used for hydraulic power applications as well as for applications involving high viscosity liquids. They are self-priming since they can pump air like all positive displacement pumps. The choice between gear pumps and other pump types depends on several factors, including the specific application requirements, fluid properties, flow rates, pressures. It's important to evaluate these factors and consult with experts like our team at Kelair to determine the most suitable pump type for a particular application.

Here's a comparison between Gear pumps and some other commonly used pump types:

Gear Pump vs Centrifugal

• After 200cst the efficiency of centrifugal pumps drops significantly making them unsuited for viscous liquids
• Provide constant pressure despite fluctuations in viscosity.

Gear pump vs Diaphragm pump

• Higher pressure handling.
• No valves to clog or be over pressurised to open.
• Reversible (with limitation)

Gear pump vs Peristaltic pump

• No Pulsations
• Construction is of metallic parts so less prone to wear.
• Handle solvents, & chemicals.

Gear pump vs Vane pump

• Abrasive Solids are a challenge.
• Pumps can be much larger for viscous fluids compared to other types.

Gear pump vs Lobe pump

• Utilised less seals 1 against 2
• Timing gears are not required.
• Up to half the cost of lobe.
• Easier to maintain and rebuild.

Gear pump vs Progressing Cavity

• Compact Design
• More material choices
• Lower cost
• More tolerant of dry running
• Seal less
• Handle solvents
• Repair costs lower