Unique Pump System, Kailash Industrial Complex, Vikhroli West
When your operation depends on moving viscous, high-temperature, or chemically aggressive fluids — without downtime, leaks, or pressure loss — you need a gear pump that is engineered to last. Unique Pump Systems has been manufacturing precision rotary gear pumps for Indian industry since 1988, serving refineries, chemical plants, food processors, steel mills, and more across the country.
Our UA Series gear pumps are industry-tested across hundreds of installations and trusted by professionals who cannot afford failure. Whether you're looking to buy gear pump online for a new project or replace an ageing unit, our application engineers will help you select the right model — fast. From 2 LPM to 6,000 LPM, we have a solution precisely matched to your flow rate, viscosity, pressure, and fluid chemistry.
Unique Pump Systems UA Series — Rotary Gear Pump Range
A gear pump is a type of positive displacement (PD) pump that moves fluid by trapping a precise, fixed volume of liquid between interlocking gear teeth and the pump casing, then forcing it from the inlet to the outlet with every rotation. Unlike centrifugal pumps that rely on velocity, a gear pump delivers a smooth, constant, pulse-free flow that is directly proportional to its rotational speed — regardless of discharge pressure. This makes it the preferred choice for metering, dosing, and transferring highly viscous or shear-sensitive fluids across demanding industrial applications.
Gear pumps are available in two fundamental designs: the external gear pump and the internal gear pump. Both operate on the same positive displacement principle but differ in configuration, making each better suited for specific viscosity ranges and flow requirements.
Understanding the working principle of a rotary gear pump helps you select the right unit and maintain it effectively. Here is a step-by-step breakdown of the operating cycle:
Schematic diagram of an external rotary gear pump showing the fluid path from inlet to outlet
As the gears rotate and unmesh on the inlet side, expanding cavities between gear teeth create a low-pressure zone. This draws fluid in from the suction port smoothly — no priming required for most viscous fluids.
The fluid is captured within the pockets formed between each gear tooth and the pump casing. As the gears rotate, this trapped volume is carried around the outer casing — from the low-pressure inlet toward the high-pressure outlet.
At the outlet side, the gear teeth come back into mesh, squeezing the fluid out of the tooth pockets and forcing it through the discharge port under controlled, consistent pressure — up to 70 kg/cm² in our UA Series.
The result is a steady, metered flow that varies only with rotational speed — not pressure fluctuations. This predictability makes gear pumps ideal for metering, dosing, and applications where a constant delivery rate is critical to your process.
Gear pumps have earned their place as a cornerstone of industrial fluid handling because they solve real problems that other pump types cannot. Here is why engineers and plant managers across India specify gear pumps for their most critical applications:
Gear pumps are inherently self-priming, which means faster startups and no manual intervention — saving valuable time in high-throughput operations.
The fixed-volume displacement per revolution gives you exact metering control. Ideal for chemical dosing, additive injection, and batch processing where accuracy matters.
Where centrifugal pumps struggle, gear pumps excel. They efficiently transfer fluids up to 100,000 CST — from heavy fuel oil and bitumen to molasses and resins.
The simple, two-gear mechanism means fewer moving parts, less maintenance, and a smaller footprint — making installation easier even in space-constrained plant environments.
Our helical gear design ensures smooth tooth engagement, eliminating the pulsation and vibration that can damage downstream equipment or disturb sensitive processes.
Gear pumps can be reversed to change the direction of flow simply by reversing motor rotation — providing operational flexibility for loading and unloading applications.
Our rotary gear pumps handle a vast spectrum of industrial fluids with confidence. Here are the most common fluid categories and their real-world applications:
Viscosity Range: Up to 100,000 CST | Temperature Range: Up to 200°C+ (with steam jacketed options available)
The two most common reasons gear pumps fail prematurely are shaft deflection under pressure and poor gear engagement quality. Our UA Series is engineered to address both — delivering operational lifespans of 10–20 years or more in the right application.
Long Service Life — Built to Outlast the Competition
Minimum Shaft Deflection — Precision Under Pressure
Selecting the correct type of gear pump is critical to achieving the best performance, longevity, and cost-efficiency for your process. Unique Pump Systems manufactures both principal types of rotary gear pump — each optimised for distinct operating conditions:
Uses two identical, externally toothed spur or helical gears that mesh together within a close-tolerance casing. The simplest and most widely used gear pump configuration in Indian industry.
Best for: Oil transfer, hydraulic systems, chemical processing, fuel handling
Uses one externally toothed (pinion) gear rotating inside a larger internally toothed ring gear. A fixed crescent-shaped divider separates the inlet from the outlet, creating two distinct flow chambers.
Best for: Bitumen, resins, food-grade fluids, high-viscosity chemical transfer
Our UA Series covers the widest capacity range available from any single rotary gear pump manufacturers in India — from compact 2 LPM units for precision dosing to heavy-duty 6,000 LPM models for bulk fluid transfer. Every model is manufactured to the same exacting standards at our Mumbai facility.
| Model No. | Suction X Delivery Size | Capacity Range LPM | Std. Pump Speed RPM |
|---|---|---|---|
| UA-5 | 3/8" x 3/8" | 2 To 5 | 1440 |
| UA-10 | 1/2" x 1/2" | 6 to 20 | 1500 |
| UA-15 | 3/4" x 3/4" | 21 to 30 | 1500 |
| UA-15SP | 3/4" x 3/4" | 31 to 50 | 1500 |
| UA-20 | 1" x 1" | 51 to 75 | 1500 |
| UA-25 | 1 1/2" x 1 1/2" | 76 to 100 | 1500 |
| UA-25 SP | 1 1/2" x 1 1/2" | 101 to 160 | 1500 |
| UA-50 | 2" x 2" | 161 to 225 | 1500 |
| UA-50 SP | 2 1/2" x 2 1/2" | 226 to 350 | 1500 |
| UA-100 | 3" x 3" | 351 to 550 | 1500 |
| UA-100 SP | 3" x 3" | 351 to 750 | 1500 |
| UA-200 | 4" x 4" | 751 to 1200 | 1500 |
| UA-400 | 4" x 4" | 1201 to 1800 | 960 |
| UA-600 | 6" x 6" | 1801 to 2500 | 960 |
| UA-800 | 8" x 8" | 2501 to 6000 | 720 |
Running your gear pump at the correct speed for your fluid viscosity is critical to achieving maximum efficiency, seal life, and longevity. Use this guide — or consult our engineers for a precise recommendation:
| Viscosity Range (CST) | Recommended Pump Speed (RPM) |
|---|---|
| Up to 400 | 1440 |
| 400 to 1000 | 960 |
| 1000 to 3500 | 720 |
| 3500 to 10000 | 500 |
| 10000 to 50000 | 200–300 |
| 50000 & above | Please Consult Our Engineers |
From the oil refineries of Gujarat to the steel plants of Odisha, from pharmaceutical hubs in Hyderabad to food processing units in Punjab — Unique Pump Systems' gear pumps power critical fluid transfer operations across every major industrial sector in India. Our pumps are field-proven in the most demanding environments, built to keep your production running without interruption.
Refineries, oil depots, fuel transfer stations, lubricant manufacturing.
Chemical processing, solvent handling, API manufacturing, resin plants.
Edible oil processing, sugar mills, syrup transfer, chocolate manufacturing.
Steel plants, thermal power stations, lubrication systems, fuel firing.
Coating applications, adhesive transfer, chemical dosing in paper mills.
Paint manufacturing, printing ink transfer, pigment dispersion.
The material of construction is one of the most critical decisions when buying a gear pump. The wrong material choice can lead to rapid corrosion, contamination, or premature failure. Our application engineers help you select the precise metallurgy based on your fluid chemistry, temperature, pressure, and operating environment.
| Material | Key Properties | Recommended For |
|---|---|---|
| Cast Iron | Good wear resistance, cost-effective, handles moderate corrosion | Lubricating oils, hydraulic fluids, fuel oil, non-corrosive fluids |
| Mild Steel | Higher strength than cast iron, weldable, versatile | Fuel transfer, power plants, steel mills, general industrial applications |
| Stainless Steel SS304 | Excellent corrosion resistance, hygienic, good general chemical resistance | Food processing, edible oils, mild chemicals, pharmaceutical applications |
| Stainless Steel SS316 | Superior corrosion resistance including chlorides and acids | Aggressive chemicals, saline environments, pharmaceutical APIs, marine use |
| Gun Metal & Bronze | Excellent corrosion resistance, non-sparking, non-magnetic | Seawater handling, marine applications, flammable fluid environments |
| Super Alloys (Hardened) | Maximum hardness and wear resistance, extreme temperature capability | Abrasive fluids, high-temperature applications, bitumen, heavy fuel oil |
Our gears and shafts are manufactured from carbon steel or stainless steel and precision hardened — providing the tight clearances and wear resistance essential for maintaining volumetric efficiency over years of continuous operation.
If you have a foreign-make gear pump and need an Indian replacement, Unique Pump Systems can manufacture exact equivalents based on your OEM drawings, samples, or dimensional data — at a fraction of the import cost.
Our UA Series uses precision-ground helical gears rather than standard spur gears — delivering measurable performance advantages that your plant will notice from day one:
Unlike conventional designs that require complex thrust bearing assemblies, our hydraulically balanced configuration offers a fundamentally superior approach:
Maintaining tight gear-to-casing clearances at high operating pressures is the engineering challenge that separates quality gear pumps from inferior ones. Our design solves this with:
Selecting the right gear pump is not just about matching a flow rate on a datasheet. Every application has unique variables — fluid viscosity at operating temperature, NPSH available at the suction, back pressure in the system, seal compatibility, and more. A wrong selection can mean premature failure, safety hazards, or process inefficiency.
Our application engineers have deep experience specifying gear pumps across hundreds of industrial applications throughout India. When you contact us, please share the following information to get the most accurate recommendation:
Information to Share With Our Engineers
No obligation. Our engineers will review your requirements and recommend the right gear pump — typically within 24 hours.
📄 Send Your RequirementsPerformance curves help you understand how your gear pump will behave across its operating range — and are essential for verifying that the selected model will deliver the required flow at your system's discharge pressure. Unlike centrifugal pumps whose flow drops sharply with increasing pressure, a gear pump's performance curve is nearly flat — confirming constant flow across a wide pressure range.
The near-flat performance curve of a gear pump confirms stable, consistent flow delivery across the full operating pressure range — a key advantage over centrifugal designs.
For model-specific and application-specific performance curves with exact data for your selected UA Series model and fluid viscosity, please contact our application engineering team.
Understanding the internal construction of a gear pump helps you appreciate the engineering precision that goes into every Unique Pump Systems product — and why our pumps outlast cheaper alternatives.
Illustrative cross-section of a UA Series external gear pump showing key internal components. Contact us for detailed engineering drawings.
Beyond our industry-leading range of rotary gear pumps, Unique Pump Systems manufactures a comprehensive portfolio of industrial pumps and sealing solutions — engineered to the same exacting standards that our customers have trusted since 1988.
When you need to buy gear pump in India — whether for a new installation or as an urgent replacement — the choice of manufacturer matters enormously. Here is why plant engineers and procurement professionals across India choose Unique Pump Systems:
Common questions from engineers and buyers looking to purchase or specify industrial gear pumps in India:
Tell us your application — flow rate, fluid, viscosity, pressure — and our application engineers will recommend the perfect rotary gear pump from our UA Series. Fast, accurate, and no obligation.
⭐ 2-Year Warranty | Serving India Since 1988 | Free Application Engineering Support
Gear Pump — Other Locations We Serve Across India
