Rotary Lobe Pump
We provide a wide range of positive displacement pumps
Rotary Lobe Pump
Product Details:
- Product Type: Rotary Lobe Pump
- General Use: Industrial applications
- Material: Stainless Steel
- Type: NW65
- Pressure: Up to 12bar
- Automatic : Customized
- Flow： 10m3/h
Product Description for rotary lobe pump
NEWAFLUIDS rotary lobe pumps a type of positive displacement pump that changes the working volume by the relative motion between the rotor and the pump body, thereby increasing the energy of the liquid.
The system relies on two synchronously rotating, counter-rotating rotors to generate suction at the inlet during rotation, thereby drawing in the material to be conveyed. The two rotors divide the rotor chamber into several small spaces, which operate in a specific sequence, repeating continuously to achieve continuous conveying of the medium.
Rotary Lobe Pump Working Principle
The core of a rotary lobe pump is the periodic change in volume.
Intake: The rotor rotates in reverse, expanding the inlet volume → creating a vacuum → drawing in the medium.
Transport: The medium is sealed within the rotor and pump chamber, smoothly transported to the outlet.
Discharge: The outlet volume decreases → compressing and expelling the medium, continuously without pulsation.
Rotary Lobe Pump Structure
Pump Body: Stainless steel / Cast iron, corrosion-resistant and easy to clean.
Rotor: Two-lobe / Three-lobe / Claw type / Cam type, suitable for different viscosities and particulate media.
Sealing System: Mechanical seal (commonly used in sanitary grade) / Packing seal, leak-proof and durable.
Drive Unit: Motor + Gearbox, low speed, high torque, and stable operation.
Core advantages of rotary lobe pumps
- High viscosity adaptability: Capable of conveying media with a viscosity of 1,000,000 CP (syrup, asphalt, glue), where centrifugal pump efficiency drops drastically at high viscosity.
- Low shear protection: Gentle conveying, does not damage emulsions, juices, or cell structures, making it the first choice for food/pharmaceutical applications.
- Strong self-priming capability: No priming required for startup; can self-prime while dry, suitable for frequent start-stop/priming difficulties.
- Stable and metered flow: Positive displacement design; flow rate does not fluctuate with back pressure, accuracy ±0.5%, suitable for metered conveying.
- Compact and easy-to-maintain structure: Simple disassembly and assembly, few parts, hygienic and easy to clean with CIP/SIP.
- Bidirectional conveying: Reverse conveying is achieved by reversing the direction of rotation, suitable for unloading/circulation conditions.
Application industries of rotary lobe pumps
- Food and Beverage: Jams, yogurt, chocolate syrup, sugar syrup, fruit juice (hygienic stainless steel rotary pump).
- Daily Chemicals: Shampoo, lotion, toothpaste, laundry detergent (low shear + corrosion resistant).
- Pharmaceuticals and Medical: Ointments, nutritional solutions, vaccines (hygienic, thorough, easily sterilizable).
- Petrochemicals: Crude oil, asphalt, adhesives, resins, acids and alkalis (high viscosity + corrosion resistant materials).
- Environmental Wastewater Treatment: Sludge, mud, fibrous wastewater ( anti-clogging).
- Marine/Shipping: Fuel oil, lubricating oil, bilge water (strong self-priming, compact structure).
Key Points for Selecting Rotary Lobe Pump
- Media characteristics: viscosity, temperature, particle size, corrosiveness (stainless steel/rubber material selection).
- Flow rate and pressure: flow rate is proportional to speed; pressure up to 16 bar (industrial grade).
- Sanitary grade: Sanitary rotary lobe pump (304/316L stainless steel, no dead zones, CIP cleaning) is selected for food/pharmaceutical applications.
- Speed control: Low speed (50–300 rpm) is selected for high viscosity; higher speed can be selected for low viscosity.
Comprehensive Comparison Table
| Comparison Item | Rotary Lobe Pump | Centrifugal Pump | Gear Pump | Screw Pump |
|---|---|---|---|---|
| Pump Type | Positive Displacement | Dynamic / Centrifugal | Positive Displacement | Positive Displacement |
| Working Principle | Intermeshing lobes change cavity volume to convey medium | Impeller centrifugal force converts kinetic energy to pressure | Meshing gears trap and push liquid continuously | Twin/Triple screw axial propulsion, sealed cavity delivery |
| Viscosity Adaptation | Low ~ Ultra-high viscosity | Only low viscosity | Medium ~ High viscosity | Medium ~ Ultra-high viscosity |
| Solid Particle Handling | Good, anti-clogging | Poor, easy to wear impeller | Poor, not for large particles | Excellent, suitable for sludge & fiber |
| Flow Stability | Constant flow, unaffected by back pressure | Flow drops obviously with higher head | Stable flow | Ultra-stable, low pulsation |
| Self-Priming Capacity | Excellent, up to 8m | Weak, needs priming first | Good | Very good |
| Shear Force | Low shear, protects sensitive materials | High shear, easy to damage emulsion | Medium shear | Ultra-low shear |
| Pressure Capacity | Medium to high | Low to medium | Medium | High pressure |
| Bidirectional Conveying | Support reversible operation | Not support | Support reversible | Support reversible |
| Noise Level | Low | Medium | Medium-High | Lowest, smooth running |
| Cleaning & Sanitation | Sanitary design available, easy CIP/SIP | Ordinary industrial design | Hard to clean dead corners | Sanitary type optional |
| Main Application | Food, beverage, cosmetic, pharmaceutical, high-viscosity slurry | Water supply, chemical water, low-viscosity liquid | Hydraulic oil, lubricant, resin, glue | Sludge, sewage, heavy oil, pulp, chemical slurry |
| Maintenance Cost | Low, simple structure | Medium | Medium | Low, long service life |
| Model | Displacement (L/r) | Rotation Speed (r/min) | Flow Rate (M³/h) | Dischage Pressure (Mpa) | Electrical Power (Kw) | Suc. Pressure (Mpa) | Inlet & Outlet (mm) |
|---|---|---|---|---|---|---|---|
| NW25 | 0.15 | 0-600 | 2 | 0.1-1.2 | 0.55-2.2 | -0.095 | 25 |
| NW40 | 0.32 | 0-550 | 5 | 0.1-1.2 | 1.5-4 | -0.095 | 40 |
| NW50 | 0.65 | 0-550 | 10 | 0.1-1.2 | 2.2-7.5 | -0.095 | 50 |
| NW65 | 1.74 | 0-550 | 20 | 0.1-1.2 | 4-15 | -0.095 | 65 |
| NW80 | 2.48 | 0-550 | 30 | 0.1-1.2 | 5.5-22 | -0.095 | 80 |
| NW100 | 3.65 | 0-550 | 40 | 0.1-1.2 | 7.5-30 | -0.095 | 100 |
| NW125 | 4.60 | 0-550 | 50-80 | 0.1-1.2 | 11-45 | -0.095 | 125 |
| NW150 | 11.56 | 0-420 | 120 | 0.1-1.2 | 22-90 | -0.095 | 150 |
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