Products Description
Need a reliable airlock valve for your pneumatic conveying system?
Guanjiang's Rotary Discharge Valve (Rotary Feeder / Star Valve) is a key component widely used in pneumatic conveying systems and powder handling processes. Through the continuous rotational movement of the rotor, it achieves quantitative discharge and airtight conveying of powdered and granular materials. The precisely designed minimal clearance between rotor and valve body ensures continuous feeding while effectively isolating upstream and downstream pressure differences — achieving up to 99.5% airlock efficiency.
Key Advantages
Precision clearance design ensures excellent airtight performance. Effectively isolates pressure fluctuations, prevents gas backflow and material reflux.
Constant discharge volume per rotor revolution. Variable frequency speed control enables precise flow regulation — smooth operation prevents material breakage.
Hardened rotor and shell extend service life by over 30%. Suitable for abrasive materials like cement, minerals, and chemicals.
Simple structure for quick disassembly and cleaning. Standardized components reduce spare part costs. Self-lubricating bearings minimize maintenance.
Standard / PTFE / High-temperature / Abrasion-resistant seals for different material characteristics.
Ex-proof motors and variable frequency drives available for hazardous environments.
SS304/SS316L construction with polished surfaces for food and pharmaceutical applications.
Technical Specifications
| Parameter | Specification Range |
|---|---|
| CapacityNon | 0.1 ~ 200 m³/h (customizable) Non |
| Rotor DiameterNon | 100mm ~ 600mm |
| Pressure RatingNon | Up to 0.1 MPa (standard) / Up to 0.35 MPa (high-pressure version) |
| Temperature RangeNon | -40°C ~ 300°C (depending on seal selection) |
| Airlock EfficiencyNon | Up to 99.5% |
| Metering AccuracyNon | ±2% (with VFD control) |
| Material of ConstructionNon | Wear-resistant steel / SS304 / SS316L |
| Drive OptionsNon | Standard motor / Explosion-proof motor / Variable frequency drive |
? Customization Options:
Rotor types: Closed rotor / Open rotor / Flexible tip rotor / Adjustable rotor
Seal types: Standard lip seal / PTFE seal / Mechanical seal / Air-purge seal
Surface finish: Standard mill finish / Mirror polish (for food/pharma) / Hard chrome plating (for abrasives)
Inlet/Outlet configurations: Square / Round / Custom flange dimensions
Applications
| Industry | Typical Applications |
|---|---|
| Chemical IndustryNon | Plastic pellet conveying, catalyst addition, raw material feeding |
| Food ProcessingNon | Flour metering, sugar powder conveying, food additive feeding |
| PharmaceuticalNon | API conveying, excipient metering, intermediate transfer |
| Building MaterialsNon | Cement conveying, fly ash handling, dry mortar feeding |
| Environmental EngineeringNon | Dust collection systems, fly ash treatment, material recovery |
Frequently Asked Questions
Q1: How does the rotary discharge valve achieve airlock sealing?
A: The precisely machined minimal clearance (typically 0.1-0.3mm) between the rotor tips and the valve housing creates an effective seal. As the rotor turns, material fills the pockets and is discharged at the bottom, while the close clearance prevents air or pressure from passing through — achieving up to 99.5% airlock efficiency.
Q2: What types of materials can be handled?
A: The rotary valve handles powders, granules, pellets, and flakes — from fine powders (e.g., flour, cement, API) to larger pellets (e.g., plastic resin, grains). For sticky or cohesive materials, we recommend an open rotor or flexible tip design to prevent material build-up.
Q3: What sealing options are available for different applications?
A: We offer multiple seal types: Standard lip seal (general purpose), PTFE seal (food/pharma, high temperature), Mechanical seal (high pressure, hazardous gases), and Air-purge seal (fine powders, prevents leakage into bearing). Selection depends on pressure, temperature, and material characteristics.
Q4: How do you prevent material degradation or breakage?
A: For friable or fragile materials (e.g., tablets, crystals, pellets), we offer variable frequency drive control to reduce rotor speed. Additionally, open rotor designs with fewer pockets minimize compression and shearing. This ensures gentle handling without degradation.
Q5: How is the rotary valve maintained and cleaned?
A: The simple modular design allows quick disassembly without special tools. The rotor can be removed for inspection or cleaning. For food and pharmaceutical applications, we offer CIP (Clean-in-Place) compatible designs with polished surfaces and sanitary seals — minimizing downtime between batches.
Need a reliable rotary discharge valve for your pneumatic conveying system?
Request a Quote → Download Datasheet (PDF)* Please provide your required capacity (m³/h), material type, operating pressure, and temperature for a fast, accurate quotation.
