Manufacturer of Rotary Gear Pump
Gear pumps are one of the most widely used positive displacement pumps, known for their simplicity, efficiency, and consistent flow output. These pumps are designed to move fluids by means of interlocking gears, making them ideal for handling clean, viscous, and lubricating liquids. Due to their robust construction and precise flow control, gear pumps are extensively used across industries such as oil & gas, chemical processing, hydraulics, food processing, pharmaceuticals, and polymers.
Hardened Gears for Heavy Duty Easy Maintenance Leakless/ Leak proof Design High Flow at moderate Pressure Reliable, Low operating & maintenance cost.
LSHS
LYE
LATEX
Mineral
Oils
Mayonnaise
Maize
H.F.O.
Honey
Insecticides
Lacquer
L.D.O.
Lube Oil
Adhesive
Chocolate
Dowtherm
Edible Oil
Emulsion
Enamel
Paraffin
Printing ink
P.U. Foam
Plasticizers
Peanut Butter
Resins
F.O.
Formaldehyde
Fats
Fatty Acid
Glycol
Hydraulic Oil
Starch & Syrup
Sodium Silicate
Soap
TAR
Varnish
Viscose
About Us :
The simplified in and around flow design of UNIQUE Rotary pump permits easy handing of wide range of Viscosities and minimizes internal loss. Unique rotary pump is engineered for superior performance and longer life.
What is a Gear Pump?
A gear pump is a type of rotary positive displacement pump that transfers fluid using the mechanical action of rotating gears. As the gears rotate, fluid is trapped between the gear teeth and the pump casing and carried from the inlet to the outlet. Gear pumps are highly valued for their steady, pulse-free flow, compact design, and ability to operate at high pressures.
There are mainly two types of gear pumps :
» External Gear Pumps
» Internal Gear Pumps
Both types are designed to deliver accurate flow rates with excellent reliability.
HOW DOES A GEAR PUMP WORK?
The working principle of a gear pump is simple and efficient :
1. Fluid Entry - As the gears rotate, they unmesh on the inlet side, creating a vacuum that draws fluid into the pump.
2.Fluid Transfer - The fluid is trapped between the gear teeth and the pump housing.
3.Fluid Discharge - As the gears mesh again on the outlet side, the trapped fluid is forced out under pressure.
4.Continuous Flow - This process repeats continuously, providing a smooth and constant flow of liquid.
Because of this positive displacement action, gear pumps deliver a fixed volume of fluid per revolution, regardless of pressure changes.
Advantages of Gear Pumps :
Gear pumps offer numerous benefits that make them suitable for demanding industrial applications :
1. Consistent and Accurate Flow
Gear pumps provide a steady, non-pulsating flow, making them ideal for precise metering and dosing applications.
2. High Efficiency
These pumps maintain high volumetric efficiency, even at high pressures, ensuring reliable performance over long operating periods.
3. Compact and Simple Design
With fewer moving parts, gear pumps are compact, easy to install, and simple to maintain.
4. Excellent for Viscous Fluids
Gear pumps handle oils, resins, syrups, polymers, fuels, and other viscous fluids efficiently without loss of performance.
5. Long Service Life
Robust construction and minimal internal wear contribute to extended pump life and reduced maintenance costs.
6. Bi-Directional Operation
Most gear pumps can operate in both directions, providing flexibility in system design.
7. Wide Range of Applications
Gear pumps are used in hydraulics, lubrication systems, chemical transfer, food processing, pharmaceuticals, and industrial manufacturing.
Applications of Gear Pumps :
» Lubrication and hydraulic systems
» Oil and fuel transfer
» Chemical processing
» Paints, inks, and adhesives
» Food and beverage processing
» Polymer and resin handling
Long Life :
Hardened Gears provide a longer gear life and quiet pulsation free flow. the helical configuration offers greatest face area for strength. Precision machined teeth engage gradually preventing trapping of liquid which absorbs shocks. Full hydraulic balance eliminates need for specialized balancing devices or thrust bearings.
Minimum Deflection :
Bearings are internal, set close to the load. this short bearing span, combined with a short, stocky shaft, handles high pressure with minimum deflection. Force - feed lubrication by the pumped liquid results in less leakage and no contamination by the lubricant and eliminates the need for a separate lubrication system.
Type 0f Pumps :
Horizontal foot Mounted/ vertical- horizontal flange mounted ( with ded or flange connection)
Internal / External Bearings Design
Streams jacketed / Construction
Roto piston pumps
(Reversible direction pump for duty & machine tools.) - With or - Without Built-in Relief Valve
Products Range :
CAPACITIES : 2 to 6000 LPM
PRESSURE : UP T0 70 kg / cm VISCOSITIES : UP TO 1,00,000 CST
SPEED : 50 to 1500 R.PM
Industries
Steel Plants
Chemical & Pharmaceutic
Petrochemical & Refinery
Thermal Power Stations
Pulp & Paper
Food & Beverages
Fertilizers
Oil Depot
Edible Oil
Sugar & Textiles
Cement Mills
Applications
Loading & Unloading
Spray through Nozzle
Agitation
Transfer
Fuel Firing
Circulation
Lubrication
Mixers
Other Products
Screw Pumps, Gear Boxes
Chemical Pumps & Mech. Seals
Metallurgy :
Body & Covers : Mild Steel, Stainless Steel, Gun Metel, Cast Iron, Bronze, Supar Alloyz
Shaft & Gears : Carbon Steel, Stainless Steel, (Hardened and Profile ground gears if necessary)
Shaft Sealing : Oil Seal, Machanical Seal, Gland Packing
Bearing : Steel Antifriction, Bush Bearings (G.M., Bronze, Carbon, Teflon)
Specification :
| 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 t0 50 | 1500 |
| UA-20 | 1" x 1" | 51 t0 75 | 1500 |
| UA-25 | 1 1/2" x 1 1/2" | 76 t0 100 | 1500 |
| UA-25 SP | 1 1/2" x 1 1/2" | 101 t0 160 | 1500 |
| UA-50 | 2" x 2" | 161 t0 225 | 1500 |
| UA-50 SP | 2 1/2" x 2 1/2" | 226 t0 350 | 1500 |
| UA-100 | 3" x 3" | 351 t0 550 | 1500 |
| UA-100 SP | 3" x 3" | 351 t0 750 | 1500 |
| UA-200 | 4" x 4" | 751 t0 1200 | 1500 |
| UA-400 | 4" x 4" | 1201 t0 1800 | 960 |
| UA-600 | 6" x 6" | 1801 t0 2500 | 960 |
| UA-800 | 8" x 8" | 2501 t0 6000 | 720 |
Note :
With higher viscosities pumps are operated at lower speeds.
General recommendations of speed are as under
Viscosities Range In Cst |
Pump Speed (RPM) |
|---|---|
UP-400 |
1440 |
400 to 1000 |
960 |
| 1000 to 3500 |
720 |
| 3500 to 10000 |
500 |
| 10000 to 50000 |
200-300 |
| 50000 & above |
Please Consult |
This table is applicable generally for SAE-40 Oil
Pump Capacity is directly proportional to speed
If pumped fluid is poor lubricant, pump is operated at lower Speed, ranging from 200 to 1000 rpm depending on its property.
Due to constant improvement in design, specification are Subject to change without notice.
Please consult our Application Engineer for selection of pump Options :
| Without Pressure Relief valve | Type UA |
| With Pressure Relief Valve | Type UAV. Protect system from discharge line obstruction |
| Mechanical Seal | Type UAM. Positive Sealing/ Minimum Leakage. Packed pump can be retrofitted. |
| Flange Mounted | Type UAF. Provide vertical mounting facility |
| External Bearing | Type UAX. It is an externally lubricated pump recommended for use where the liquid to be transferred does not contain any lubricating properties. |
| Stem jacketed Type | UASJ. Specially for liquids which solidify or become highly viscous at Room temperature like LSHS, FO, HFO, HHS, Glucose, Soap stock, high Viscosity Oils, Wax, Grease, Coal Tar, Bitumen, Adhesives etc. Steam circulating in the pump body to heat the liquid being pumped. |
| Higher Pressure | UAHP. By providing highly precision profile ground gear high pressure up to 70kg/cm can be developed. |
| Stainless Steel | UAS & UASS. For food product & liquid which react with CI & other maintenance |
| Custome Designed Pumps | To meet special requirements. |
Performance Curves Of Rotary Gear Pump :
Pressure, Capacity & Efficiency Curve
Input B.H.P. pump, can be calulated by following formula
BHP (Rated) = Work Done
-----------
Constant x Efficiency
Q = Capacity in m3/hrx Pressure in kg/cm2
---------------------------------
27 (Hydraulic Constant) x Efficiency
Relief valve Operation :
Built in pressure relief valve is provided in pumps to operate at higher than rated pressure ie. it starts operating at 1 kg / cm higher than rated pressure and fully opens at 20 % higher than rated pressure, taking maximum 30 % higher power than rated power.
Cross Section of Standard Gear Pump :
| Part no. | Description | Qty. |
| 1 | main Body | 1 |
| 2 | Packing | - |
| 3 | Front cover | 1 |
| 4 | Oil Seal | 2 |
| 5 | Key | 1 |
| 6 | Circlip | 1 |
| 7 | Driven shaft with gear | 1 |
| 8 | Driven shaft with gear | 1 |
| 9 | Bolt with spring washer | 8 |
| 10 | Sleeve Bush / Bearing | 4 |
| 11 | Wear plate | 4 |
| 12 | Back Cover | 1 |
| 13 | Valve Seat | 1 |
| 14 | Valve | 1 |
| 15 | Spring | 1 |
| 16 | Spring Cover | 1 |
| 17 | Plug at Suction Side | 1 |
| 18 | Lock Nut | 1 |
| 19 | Relief valve Adjusting Stud | 1 |
| 20 | Packing | 2 |
| 21 | Cap Nut | 1 |
| 22 | Plug at Delivery Side | 1 |
Frequently Asked Questions (FAQs)
Q1. What types of fluids are suitable for gear pumps?
Gear pumps are best suited for clean, non-abrasive, and lubricating fluids such as oils, fuels, syrups, resins, polymers, and certain chemicals.
Q2. Can gear pumps handle high-viscosity fluids?
Yes, gear pumps are highly effective for pumping high-viscosity fluids and maintain consistent flow even with thick liquids.
Q3. Are gear pumps self-priming?
Yes, most gear pumps are self-priming and can draw fluid into the pump without external priming assistance.
Q4. What is the difference between internal and external gear pumps?
External gear pumps use two identical external gears, while internal gear pumps use one external gear and one internal gear. Internal gear pumps are generally quieter and better suited for very viscous fluids.
Q5. Are gear pumps easy to maintain?
Yes, gear pumps have a simple mechanical design with fewer components, making maintenance straightforward and cost-effective.
Q6. Can gear pumps be used in food and pharmaceutical industries?
Yes, when manufactured using hygienic materials such as stainless steel and designed to meet industry standards, gear pumps are suitable for food and pharmaceutical applications.