External gear pumps utilize two external gears rotating in the same direction within a close-fitting housing. As these gears rotate, fluid fills the spaces between the gear teeth and gets pushed out through the outlet.
External Gear Pumps
92 series from 10 manufacturers
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- Acetate
- Adhesives
- Agriculture
- Aviation
- Beauty & Personal Care
- Brewing and beverages
- Building Services
- Carbon Fibers
- Ceramics
- Chemical
- Dairy
- Detergents
- Docks
- Dye & Pigment
- Emulsions
- Fertilizers
- Fish Farming
- Flood Defence
- Food & Beverage
- Gas terminals
- Heating, Water & Sanitation
- Marine
- Mining
- Nuclear Power Plants
- Offshore
- Oil & Gas
- Paint & Surface Coating
- Paints & Resins
- Paper Mills
- Petrochemical
- Pharmaceutical
- Plastic
- Polymer Extraction
- Power Generation
- Refineries
- Research & Development
- Rubber
- Surface / Pit
- Surface Finishing
- Synthetic Fibers
- Textile
- Transportation
- Underground
- Viscose
- Wastewater
- Water Treatment
- Yarn Lubrication & Finishing
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- Analysis
- Booster
- Circulation
- Cleaning
- Control
- Conveying
- Cooling
- Descaling
- Desinfection
- Dewatering
- Diagnostic
- Discharge
- Distribution
- Dosing
- Drain
- Drainage
- Dual Dispensing
- Extraction
- Feed
- Filling
- Filtration
- Flow Control
- Greasing
- Grinding
- Handling
- Heating
- High-Pressure
- High-Temperature
- High-Volume
- Injection
- Irrigation
- Level Control
- Lift
- Lifting
- Loading
- Low-Pressure
- Lubrication
- Medium-Pressure
- Metering
- Off-loading
- Powder Coating
- Pressurisation
- Process
- Processing
- Recirculation
- Recovery
- Refueling
- Replacement
- Rinsing
- Sampling
- Settling
- Spraying
- Tempering
- Transfer
- Treatment
- Ultra High-Pressure
- Unloading
- Volumetric Dispensing
- Washing
- Water-Jet Cleaning
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- Abrasive Liquids
- Acetate
- Acids
- Adhesives
- Alcohols
- Ammonia
- Beer
- Biological Broths and Slurries
- Bitumen
- Carbon Fibers
- Caustic Solutions
- Cereals
- China Clay Slurry
- Chocolate
- CIP Fluids
- Clay
- Coffee
- Concrete
- Cooling Water
- Corrosive Dyes
- Corrosive Liquids
- Cryogenic Liquids
- Crystalline Slurry
- Dairy Products
- Detergents
- Diesel Fuel Oil
- Drinking Water
- Dye Pigment
- Emulsions
- Ethylene Glycol
- Ferric Chloride
- Fertilizers
- Foam Protein
- Fruit and Vegetables
- Fruit Concentrates
- Gels
- Glycol
- High Temperature Oils
- High Viscosity Liquids
- Hydrochloric Acid
- Hygienic Liquids
- Irrigation Water
- Lake Water
- Latex
- Light Fluids
- Lime
- Liquid CO2
- Low NPSH
- Low Viscosity Liquids
- LPG
- Meat
- Milk
- Molasses and Syrups
- Must
- Non-Newtonian Fluids
- Oil, Fats and Mayonnaise
- Paints
- Paints Resins
- Personal Care Products
- Pet Food
- Phosphoric Acid
- Plastic
- Process Condensate
- Produced Water
- Radio Active Fluids
- Redox
- Refrigerants
- Rubber
- Sauces
- Seawater
- Sensitive and Viscous Fluids
- Separated Oil Processing
- Sewage
- Silver Nitrate
- Soaps and Detergents
- Solids and Abrasives
- Solvents
- Spirits
- Sulphuric Acids
- Surface Water
- Surfactants
- Synthetic Fibers
- Thermal Oil
- Thin Liquids
- Thixotropic Fluids
- Toluene
- Toxic Liquids
- Ultra Pure Water
- Vegetable Oils
- Vinegar
- Viscose
- Viscous Liquids
- Wastewater
- Water
- Water Hardness
- Wine
- Wort
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- Abrasion Resistant
- Adjustable-Flow
- Canned
- Chemically Resistant
- Close-Coupled
- Compact
- Containment
- Corrosion-Proof
- Direct-Drive
- Double-Acting
- Electric
- Explosion-Proof
- Flange
- Heavy-Duty
- High System Pressure
- High Temperature
- High-Efficiency
- High-Flow
- High-Performance
- Horizontal Mount
- In-Line
- Intrinsically Safe
- Low Shear
- Low-Noise
- Magnetic Drive
- Mechanical
- Mechanical Seal
- Mobile
- Modular
- Multi-Stage
- Non-Metal
- Oil-Free
- Pulse-less
- Rotary
- Rugged
- Sanitary
- Seal-less
- Self-priming
- Single-Stage
- Solids Handling
- Variable Speed
- Vertical
- Vertical-Mount
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Operating Principle of External Gear Pumps
External gear pumps have two external gears that mesh and rotate in the same direction in a closely fitting housing. As these gears rotate, the space between the corresponding gear teeth fills with fluid which gets pushed out through the outlet as no fluid can pass between the teeth mesh.
Gear Interaction
External gear pumps comprise two gears with external teeth that mesh within a housing. Both gears rotate in the same direction, maintaining a close clearance with the pump housing. This rotation creates chambers between the gear teeth.
Fluid Movement
As the gears rotate, fluid is drawn into the pump casing as the teeth unmesh, creating an expanding volume. Fluid fills the spaces between the teeth as they rotate and then gets transported to the discharge side as the gear teeth mesh together, reducing the chamber volume and pushing the fluid out through the outlet.
Sealed Operation
The gears and pump housing maintain close tolerances, ensuring minimal leakage between the suction and discharge sides. This design enables efficient fluid transfer with relatively low internal leakage.
Flow Control
Like internal gear pumps, external gear pumps are positive displacement pumps, meaning they displace a consistent volume of fluid per revolution. This allows for precise control over the delivered flow rate based on the rotational speed of the gears.
Advantages of External Gear Pumps
- High-Pressure Capability: Ideal for applications requiring high-pressure, low-flow fluids.
- Precision Flow: Accurate for dosing chemicals, oils, and fuels in OEM components.
- Versatility: Suited for low to medium viscosity fluids.
- Applications: Hydraulic systems, power steering systems, fuel injection systems, and continuous dosing of chemicals, oils, and fuels.
Applications of External Gear Pumps:
- High-Pressure Low-Flow Fluids: Delivering fluids under high pressure.
- Precision Dosing: Used in OEM components and machinery for precise chemical, oil, and fuel dosing.
- Hydraulic Systems: Essential in hydraulic setups.
- Power Steering & Fuel Injection: Ensures efficient operation in these systems.
|
Application |
External gear pump |
Internal gear pump |
|
Acids and caustics |
x |
|
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Agricultural |
x |
|
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Alcohol and solvents |
x |
x |
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Asphalt, bitumen and tar |
|
x |
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Chemical additives |
x |
x |
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Chemical mixing and blending |
x |
|
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Cooking oil filtration / reclamation |
x |
x |
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Cooling liquids for electric car fast chargers |
x |
|
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Food products (e.g. corn syrup, peanut butter, vegetable fats/oils, etc.) |
|
x |
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Fuels and fuel oils |
x |
x |
|
Glycol |
|
x |
|
Industrial and mobile hydraulics |
x |
|
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Isocyanates & polyols |
x |
x |
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Liquid transfer in fuel cells |
x |
|
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Lube oils |
x |
x |
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Paint, ink and pigments |
|
x |
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Polymers metering |
x |
x |
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Resins and polymers |
|
x |
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Soaps and surfactants |
|
x |
Important considerations when selecting External Gear Pumps
- Flow Rate: Choosing the correct external gear pump involves assessing the required flow rate. Inadequate rates might affect performance, while excessive rates could result in pressure irregularities and wear.
- Viscosity: External gear pumps are proficient with low to medium viscosity fluids. Higher viscosity liquids might necessitate adjustments in gear speed for efficient handling.
Why buy External gear pumps from AxFlow?
AxFlow provides a diverse range of External gear pumps tailored to various industries. Our experts offer comprehensive support, aiding in pump selection, specification, installation, and maintenance. Reach out to AxFlow for personalized guidance in choosing the ideal external gear pump for your specific requirements.
