High-Torque Laboratory Overhead Stirrers & Electric Agitators

As a premier ISO-certified B2B manufacturer of general laboratory equipment, Hangzhou Qiwei Instrument Co., Ltd. produces commercial-grade Laboratory Overhead Stirrers and Electric Agitators engineered for viscous media mixing, chemical synthesis, polymer emulsification, and industrial pilot plant testing.

Equipped with heavy-duty brushless DC motors, constant-speed electronic feedback control, and digital LCD displays, our agitators handle fluid viscosities up to 50,000 mPa·s and mixing volumes up to 40 liters with automatic overload protection.

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Electric Overhead Stirrer
Model: QW-JB-250S
Output Power: 250 W
Power Supply: 220V 50 Hz
Speed Regulation Range: 10-500 rpm
Stirring Rod: ￠8×340mm (Stainless steel stirring paddle)
Dispersator
Model: JB-SF550
Power: 550W
Adjustment Range: 0-6000r/min
Dispersion Disc: 50mm, 60mm
Dispersing Mixer
Model: JB-SF550D
Power: 550W
Adjustment Range: 0-6000r/min
Dispersion Disc: 50mm, 60mm
Dispersion Mixer
Model: JB-SF550DS
Power: 550W
Speed Range: 0-6000 r/min
Dispersing Disc Size: 50mm, 60mm
Manual Lifting Stirrer
Model: QW-JB-250
Output Power: 250W
Power Supply: 220V 50Hz
Speed Regulation Range: 10-500rpm
Electric Stirrer
Model: QW-JB-250S
Output Power: 250W
Power Supply: 220V 50Hz
Speed Regulation Range: 10-500rpm
Cross Base Overhead Stirrer
Model: QW-JB-250D
Output Power: 250W
Power Supply: 220V 50Hz
Speed Regulation Range: 10-500rpm
Brushless Mixer
Model: QW-WS60-SH
Motor Power: 60w
Timing Function: No
Speed Range: 100-1600rpm
Brushless Stirrer
Model: QW-WS60-ST
Motor Power: 60w
Timing Function: 0-9999min
Speed Range: 100-1600rpm
Digital Constant Speed Mixer
Model: JB60D
Output Power: 60W
Power Supply: AC 220V 50Hz
Speed Regulation Range: 100-2000r/min, 3000r/min or customized according to user requirements
Lab Digital Constant Speed Mixer
Model: JB60-SH
Motor Power: 60W
Timing Function: None
Range of Speed: 100-1500rpm
Lab Digital Disperser
Model: JB60-ST
Motor Power: 60w
Timing Function: 0-999min
Range Of Speed: 100-1500rpm

Explore Our Laboratory Agitator Series

Versatile overhead stirring equipment designed for low to high viscosity media, high-shear dispersion, and continuous heavy-duty laboratory operation.

1. Digital High-Torque Overhead Stirrers

Heavy-duty laboratory agitators with digital LCD speed/torque indicators, constant-speed electronics under changing viscosity, and pass-through shaft design for easy impeller length adjustment.

Speed Range: 50 to 2200 RPM ($\pm 1\,RPM$)
Viscosity handling up to 50,000 mPa·s
Overload and over-temperature safety auto-shutdown

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2. Compact Standard Agitators

Space-saving overhead stirrers engineered for low to medium viscosity aqueous solutions, water sample pre-treatment, and general analytical titration support.

Max stirring capacity: Up to 20 Liters ($H_2O$)
Brushless DC motor for quiet continuous operation
Stepless analog control or digital LED speed display

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3. Stirring Impellers & Shaft Accessories

High-quality 316L stainless steel and corrosion-resistant PTFE-coated impeller blades—including propeller, anchor, paddle, and radial flow designs for custom flow dynamics.

316L Stainless Steel & PTFE anti-corrosion options
Propeller, centrifugal, anchor, and turbine geometry
Universal Chuck compatibility ($\varnothing 0.5 - 10\,mm$)

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Critical Industrial Applications & Engineering Excellence

Where Overhead Agitators Are Essential

Overhead mechanical stirring provides powerful direct shaft drive that magnetic stirrers cannot match when handling large volumes or viscous samples. Key application fields include:

Chemical Synthesis & Polymer Research: Mixing high-viscosity resins, adhesives, paints, and polymers
Cosmetic & Pharmaceutical Formulations: Emulsifying creams, ointments, syrups, and suspensions
Environmental Water & Sewage Treatment: Preparing high-molecular flocculants and coagulant reagents alongside our Water Quality Testing Equipment
Food & Beverage Testing: Homogenizing viscous slurries, sauces, and dairy samples

Qiwei Manufacturing & OEM Advantages

Supporting global laboratory equipment suppliers, scientific dealers, and private-label buyers:

Constant Speed Electronic Feedback: Automatically adjusts motor torque when liquid viscosity changes during reactions
Quiet Brushless Motor & Safety Protection: Smooth start-up prevents liquid splashing; enclosed housing protects internal electronics from corrosive vapors
OEM & ODM Customization: Custom casing colors, private-label branding, customized plug/voltage (110V/220V), and customized stand kits
Internal Links: Combine with our General Laboratory Equipment, Magnetic Stirrers, and Electrochemical Instruments for complete lab setup.

Frequently Asked Questions (Agitator Sourcing Guide)

Q1: When should I choose an overhead stirrer (agitator) over a magnetic stirrer?

Use an overhead stirrer when dealing with high-viscosity media (such as resins, oils, or creams), large liquid volumes ($> 5-10\,L$), or reactions requiring high-torque continuous stirring. Magnetic stirrers are better suited for low-viscosity aqueous solutions in smaller flasks.

Q2: How do I select the right stirring impeller type for my application?

Propeller impellers are best for axial flow and low-to-medium viscosity fluids. Anchor impellers create high shear along vessel walls for high-viscosity fluids. Paddle impellers provide gentle tangential flow for delicate biological samples.

Q3: Do you support OEM custom branding and wholesale distributor pricing?

Yes, as a factory-direct manufacturer, we offer complete OEM/ODM custom branding, customized UI panels, private label packaging, and tiered volume discounts for global laboratory suppliers.

Require Factory Direct Pricing or Custom Laboratory Agitators?

Get in touch with Hangzhou Qiwei Instrument today for technical consultation, impeller options, and competitive distributor pricing within 24 hours.

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Hangzhou Qiwei Instrument Co., Ltd. is one of the most reliable manufacturers and suppliers of agitator in China, featured by quality products and good service. Please rest assured to buy bulk durable agitator in stock here from our factory. We also accept customized orders.

Dispersing Mixer, Electric Overhead Stirrer, Electric Stirrer