Gear pumps are a reliable solution for pumping both low and high viscosity fluids. They are used in many industries thanks to their robust construction, high precision and easy maintenance. In this guide, we look at how gear pumps work, their advantages and the most common applications.
What is a gear pump?
In gear pump is a positive displacement pump which uses rotating gears to transport fluid. Two gears spin against each other. As the gears rotate, they capture the liquid, move it through the pump and push it out the outlet. The result is a smooth and pressurized flow.
There are two types of gear pumps:
- External gear pump - two gears spin against each other in a tight pump casing.
- Internal gear pump - a smaller gear rotates inside a larger one with eccentric placement.
Gear pumps are self-sucking. This makes them easy to start even if the system is empty. They work equally well with thin liquids as with very viscous media, as long as the liquid does not contain particles.
Advantages of gear pumps
Gear pumps offer several distinct advantages over other pump types:
- Pulse-free flow provides stable operation and accurate dosing.
- Precise volume control is ideal for processes with high demands.
- Self-suction properties simplifies installation and operation.
- Withstands high pressures and temperatures - ideal for harsh industrial environments.
- Low noise level and almost vibration-free operation increase the comfort of the working environment.
Gear pumps are built for long life with minimal maintenance, lowering operating costs over time.
Areas of use
Thanks to their versatility, gear pumps are used in many different industries:
- Chemical industry - pumping of acids, solvents and polymers.
- Petrochemicals and refineries - handling of fuels, lubricating oils and asphalt.
- Paint and varnish industry - precise dosage of paint and additives.
- Food industry - pumping of oils, syrups and chocolates (in case of hygiene adaptation).
- Paper and pulp industry - transportation of glue, resin and other additives.
- Mechanical and engineering industry - oil supply and refrigerant systems.
Gear pumps can handle both continuous operation and batch processes. They deliver stable performance even at varying pressures and flows.
Our range of gear pumps - DESMI ROTAN®
At Colly Flowtech we offer gear pumps from DESMI - a leading manufacturer with long experience. ROTAN® series is known for its quality, reliability and flexibility. The range is suitable for a range of fluids, from fuels and chemicals to thick oils and polymers.
We offer several models for different needs:
- ROTAN® HD (Heavy Duty) - for demanding high viscosity and high pressure applications.
- ROTAN® CD (Chemical Duty) - resistant to aggressive chemicals.
- ROTAN® PD (Petroleum Duty)- optimized for oil and fuel.
- ROTAN® ED (Energy Duty) - a hermetically sealed, magnetic drive pump with no risk of leakage.
Our gear pumps from DESMI ROTAN®combine high performance with low maintenance. They are an excellent choice for businesses looking for a reliable and cost-effective solution.
Want to know more about our gear pumps? Explore our gear pumps here, or contact me or our team for personal advice.
This text is written by Ronnie Nilsson (ronnie.nilsson@colly.se), Salesman at Colly Flowtech.
Frequently asked questions about gear pumps
What is a gear pump?
A gear pump is a positive displacement pump that uses rotating gears to transport fluids with a steady and pressurized flow.
What types of gear pumps are there?
There are external gear pumps with two gears in a sealed casing, and internal gear pumps where a smaller gear rotates inside a larger one.
What liquids can be pumped with gear pumps?
Gear pumps handle both thin and viscous liquids, as long as they do not contain solid particles.
In which industries are gear pumps used?
They are used in the chemical, petrochemical, paint and varnish, food, pulp and paper, engineering and other industries.
Do you have any questions?
