Rotary Airlock Feeder
As a leading process valve manufacturer, Darko specializes in heavy-duty rotary airlock feeders built for the most demanding grinding, separation, and bulk material handling operations. Our rotary airlock valves are precision-engineered to deliver reliable air-mechanical sealing, stable pressure control, and consistent material flow even under high differential pressure conditions.
Whether you need reliable material feeding for V-separators, high-capacity discharge for vertical cement mills, or dust discharge for baghouses and cyclones, Darko rotary feeders provide the durability, tight sealing, and precision your industrial process demands.
- Carbon steel construction for rugged durability
- Round flanged connections in standard working sizes
- Adjustable packing gland shaft seals
- Worm gear reducer
- Compliant with common industry safety and performance standards
What Is a Rotary Airlock Feeder?
Rotary airlock feeder (also known as rotary valve or star feeder) is a core component in bulk material handling systems. Its main function is to transfer granular, powdered or pelletized materials from one chamber to another while maintaining a stable air-pressure seal—which is crucial for systems such as dust collectors, where the rotary airlock valve for dust collector plays a key role in preventing pressure loss.
In cement plants, power stations and dust collection systems, these valves play a key role in the system, allowing materials to enter pressurized or vacuum systems (such as grinding mills and baghouses) while avoiding unnecessary air leakage or pressure fluctuations.
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Controls the on-off of materials at the inlet and outlet of the two-way diverter valve, wear-resistant and flexible, standardized design, assisting in stable conveying.
Reliable single-blade damper for on/off or modulating control of air, gas, and dust-laden flow in cement, mining, and steel applications.
- Main Types of Rotary Airlock Valves
- Key Applications
- Technical Features & Specifications
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Drop-Through Rotary Airlocks
Standard gravity-fed design for most bulk material applications. -
Blow-Through Rotary Airlocks
Ideal for pneumatic conveying systems, allowing air to pass through rotor pockets. -
Heavy-Duty Abrasion-Resistant Valves
With hardened rotor tips and wear-resistant liners for clinker, coal, cement raw meal, and abrasive materials. - Dust Collector Rotary Airlock Valves
Specially designed for dust discharge from cyclones and baghouses without losing vacuum pressure.
- Fresh material inlets for V-separators
- Vertical cement mills and coal mills
- Cement plant raw material feeding systems
- Dust discharge for baghouses and industrial dust collectors
- Pneumatic conveying and bulk powder processing
| Feature | Specification & Advantage |
|---|---|
| Material | Carbon Steel, Stainless Steel, Wear-Resistant Alloy |
| Rotor Design | Open/Closed End, Beveled Edges, Scraper Blades, Replaceable Tips |
| Pressure Rating | Up to 15 PSI Differential Pressure |
| Temperature | Standard up to 250°C, high-temperature versions available |
| Drive | Direct Drive or Chain Drive with gear reducer |
| Sealing Performance | Low-leakage design for stable pressure control |
Rotary Airlock Feeder Working Principle
Direct From Manufacturer: Why Choose Darko as Your Rotary Airlock Supplier?
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Competitive Factory Pricing
Enjoy factory-direct pricing with no distributor markups, while maintaining premium material quality and engineering precision. -
Full Transparency & Direct Support
Get clear pricing, fast technical support, and direct communication with our engineering team throughout your project. -
Fully Customizable Design
We tailor rotor clearances, construction materials (carbon steel, stainless steel, wear-resistant alloys), and drive systems to match your pipeline, pressure, and material requirements. - Strict Quality Control
Every rotary airlock valve is pressure tested, leakage inspected, and performance-verified before shipment to ensure long service life.
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It provides reliable air sealing at the material inlet, preventing false air from entering and disrupting the air-to-material ratio, which is critical for separation efficiency.
We use hard-facing technology on rotor tips and offer replaceable wear parts to maintain sealing performance over long operating periods, especially in cement and coal mills.
Without a proper airlock, vacuum pressure would draw air upward through the discharge, preventing dust from falling and causing clogging or system inefficiency.