Internal Gear Pump
Positive Displacement Rotary Gear Pump
Internal gear pump for high-viscosity fluid transfer. Smooth, pulse-free flow with low shear. Ideal for oils, resins, polymers, and viscous chemicals. Wide viscosity range from 1 to 1,000,000 cP.
Product Specifications
| Parameter | Range |
|---|---|
| Flow Rate | 1 – 120 m³/h |
| Pressure | Up to 16 bar |
| Viscosity | 1 – 1,000,000 cP |
| Temperature | -20°C to +200°C |
| Materials | Cast iron, cast steel, 316SS |
| Speed | 100 – 1800 rpm |
| Seal | Mechanical seal or packing |
Product Description
The Internal Gear Pump is a positive displacement pump using an inner rotor and outer gear to transfer high-viscosity fluids with smooth, pulse-free flow. Its compact design handles viscosities from 1 to 1,000,000 cP, making it ideal for oils, fuels, polymers, adhesives, and food products. The pump delivers flow rates from 1 to 120 m³/h at pressures to 16 bar and temperatures to 200°C, with cast iron, cast steel, or 316SS construction. Suitable for petroleum, chemical, food, and industrial applications requiring gentle viscous fluid handling.
- Hydraulic performance test at multiple viscosities
- Pressure test at 1.5× rated pressure
- Gear profile inspection and backlash check
- Mechanical seal leakage test
- Material certification for wetted parts
Applications
The Internal Gear Pump handles high-viscosity fluids in a wide range of applications:
- Lubricating oil and hydraulic oil transfer
- Resins, polymers, and adhesives
- Food products (chocolate, syrup, honey)
- Asphalt and heavy oil transfer
- Chemical processing and tank truck unloading
Quality Assurance
Every gear pump undergoes thorough quality testing:
Why Choose Our Positive Displacement Pumps
Smooth, Pulse-Free Flow
The internal gear design produces continuous, smooth flow with minimal pulsation.
Wide Viscosity Range
Handles fluids from thin solvents to heavy greases and polymers.
Low Shear Design
Gentle pumping action is ideal for shear-sensitive fluids like polymers and food products.
Key Features
Frequently Asked Questions
What is an internal gear pump used for?
How does an internal gear pump work?
What viscosity range can internal gear pumps handle?
Are gear pumps self-priming?
Selection Guide
✅ When to Choose This Pump
- High viscosity fluids (above 500 cP)
- Hygienic food and beverage products
- Precision metering and dosing
- Shear-sensitive products
⚠️ When NOT to Choose
- Large volume low-viscosity transfer
- Abrasive slurries with large particles
- High-pressure water injection
- Applications requiring variable flow at constant speed
💡 Common Selection Mistakes
- Not installing pressure relief valve
- Running at too high speed for viscosity
- Ignoring shear sensitivity of product
- Not considering pulsation dampening
Still unsure? Use our Pump Selection Center → or talk to our engineers →
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