Why choose a ROTAN® internal gear pump?
ROTAN® internal gear pumps are engineered for long-term performance in demanding industrial environments. Whether you need to move high-viscosity fluids, protect against leakage, or maintain uptime across complex systems, the ROTAN® design delivers efficient, reliable flow. Built around modular principles and tested to industry standards, these pumps offer both technical precision and operational flexibility.
Key advantages include:
Smooth, pulse-free flow for consistent process performance
Self-priming operation with excellent suction characteristics
Low internal velocity to reduce shear and wear
Reversible flow direction for flexible system design
Hydrostatic testing of every unit before delivery
Certified versions for ATEX zones and API 676 compliance
Flexible to your needs
From food production to hazardous chemical handling, ROTAN® pumps are built to meet a wide range of application demands. Each pump can be tailored to the job, with configurations suited for both standard and highly specialised processes.
Choose from cast iron, carbon steel, or stainless steel to match your fluid and environment. Optional features like magnetic drive, heating jackets, and external lubrication provide application-specific flexibility. Certified configurations ensure safety and compliance, even under demanding operating conditions.
Internal Gear Pumps - ROTAN®
What is an internal gear pump?
An internal gear pump is a positive displacement pump designed to move liquids using two interlocking gears - one internal (rotor) and one external (idler) - separated by a crescent-shaped divider. It delivers a smooth, non-pulsing flow that makes it ideal for both thin and highly viscous fluids.
How it works
The rotor gear connects directly to the drive shaft and rotates inside the idler gear, which is mounted off-center. As the gears turn, liquid is drawn into the cavities between the teeth and the crescent. The crescent acts as a divider, separating the suction and discharge zones and minimizing slippage.
This configuration:
Enables gentle liquid handling, ideal for shear-sensitive media
Produces low noise due to continuous flow
Delivers high volumetric efficiency, especially at higher viscosities
Supports bidirectional pumping by reversing motor direction
Designed for serviceability
With its true back-pull-out construction, the ROTAN® pump simplifies maintenance by allowing internal components to be accessed without disturbing piping or motor alignment. Uptime cartridges make repairs even faster - enabling offline servicing and quick reinstallation. This reduces both downtime and lifecycle costs, especially in systems where availability is critical.
Internal Gear Pump Applications - ROTAN® Pumps
ROTAN® internal gear pumps are used across industries where stable, pulse-free flow and high reliability are essential. Their ability to handle a wide range of viscosities - including corrosive, abrasive, and shear-sensitive fluids - makes them suitable for both standard and highly specialised applications.
Typical applications include:
Chemical processing – acids, alkalis, solvents, additives
Bitumen and asphalt – high-viscosity fluids with heating
Food and beverage – chocolate, syrup, oils
Paints, resins, polymers – low-shear transfer
Lubrication systems – dosing in machinery
Petrochemical and fuel – refined products, hydrocarbons
Marine and offshore – sludge, bilge water, heavy oils
