Doebritz Grains Star Discharge Valve: ATEX Certified Airlock for High-Volumetric Silo Discharging | Precision CNC, Minimal Air Leakage
Doebritz Grains Star Discharge Valve – ATEX certified (Zone 20/21), 8-vane rotor, minimal air leakage, and heavy-duty durability for grain, seed, and feed conveying. CNC precision, global OEM supply.
Product Summary
Doebritz Grains Star Discharge Valve (Model DBR-1237) is a heavy-duty quick-release rotary airlock feeder engineered for high-capacity silo discharging and pneumatic conveying of free-flowing grains, seeds, feed pellets, and fine cereal powders. Built upon our renowned precision machining heritage, this valve delivers guaranteed minimal air leakage (clearances 0.1–0.2 mm) and ATEX Zone 20/21 explosion safety, making it the preferred choice for bulk handling plants that demand both production efficiency and uncompromised safety.
Why Sourcing Doebritz Grains Star Discharge Valve
- ATEX Zone 20/21 Ready: Full explosion-proof configuration with flameproof housing, 16 bar pressure rating, and anti-static rotor ensures safe operation in explosive dust atmospheres.
- Minimal Air Leakage: Precision-ground 8-vane rotor and housing achieve radial clearances of 0.1–0.2 mm, drastically reducing blow-by air and preserving pneumatic conveying line pressure.
- Quick-Release Demountable Design: Tool-less disassembly enables rapid cleaning and maintenance, reducing downtime and supporting CIP/WIP protocols for sanitary applications.
- Global OEM Supply Chain: Doebritz offers direct factory pricing, custom flange configurations (DIN/ANSI), and short lead times, backed by our ISO 9001:2015 and TÜV-certified manufacturing base.
Housing & Rotor Engineering
The housing of the Grains Star Discharge Valve is available in cast iron, carbon steel, or SUS304/SUS316L stainless steel, with internal surfaces optionally coated with tungsten carbide or ceramic for extreme abrasion resistance. The 8-vane rotor is CNC-machined from a single forging to ensure dynamic balance and wear resistance. Outboard bearings separate the rotor shaft from the product zone, preventing contamination and extending bearing life. The shaft seal system uses a lip seal with air purge option, guaranteeing zero fugitive dust emission even under high differential pressure.
Technical Specifications
| Specification | Detail |
|---|---|
| Body Material | Cast Iron / Carbon Steel / SUS304 / SUS316L |
| Rotor Design | 8-Vane, Open Rotor, Precision CNC Machined |
| Rotor-to-Housing Clearance | 0.1 – 0.2 mm |
| Shaft Seal | Lip Seal with Air Purge (Optional) |
| Bearing Configuration | Outboard Bearings, Separated from Product Zone |
| Flange Connection | HG20592, DIN, or ANSI (Customizable) |
| Pressure Rating | Up to 16 bar (Explosion-proof Version) |
| ATEX Classification | Zone 20/21/22 Compliant |
| Surface Finish (Internal) | Ra ≤ 0.8 μm (Mirror/Coated Options) |
| Operating Temperature (Ambient) | -15°C to 60°C |
| Operating Temperature (Material) | 0°C to 120°C (with Cooling Jacket Option) |
| Cleanability | Quick-Release Manual Clean, CIP, WIP |
| Certifications | CE, TÜV, ATEX Statement, Material Certificates 3.1 |
Heavy-Duty Application Scenarios
Silo & Hopper Discharging
Installed beneath storage silos, the Doebritz Grains Star Discharge Valve ensures a consistent, metered flow of grain, corn, soybeans, rice, wheat, and feed pellets. Its robust construction handles surge loads and bridging forces while maintaining volumetric efficiency above 95%.
Pneumatic Conveying Systems
Whether used in dense-phase or dilute-phase pneumatic lines, this valve functions as a reliable airlock, feeding material from a hopper into the conveying pipeline while minimizing pressure loss and maintaining stable transport velocities. The ATEX certification enables its use in grain elevators and feed mills where dust explosion hazards are prevalent.
Frequently Asked Questions
- What is the maximum working temperature for the Doebritz Grains Star Discharge Valve?
- The standard valve operates with ambient temperatures from -15°C to 60°C and material temperatures up to 120°C. For higher temperature applications, a water-cooled jacket option is available.
- Can the valve handle sticky or hygroscopic grain products?
- Yes, the rotor and housing can be supplied with a PTFE coating or mirror-polished internal surfaces (Ra ≤ 0.4 μm) to prevent material adhesion and ensure flow reliability.
- Is the valve suitable for food-grade processing?
- Absolutely. The Grains Star Discharge Valve can be configured with FDA-compliant stainless steel, CIP-ready quick-release design, and surface finishes down to Ra 0.8 μm, meeting Class W, 10W, and C/D cleanroom standards.
- How do I determine the correct size for my system?
- Our engineering team will calculate the required volumetric throughput based on your bulk density, conveying pressure, and required feed rate. Common flange sizes DN150, DN200, and DN300 are available, with custom dimensions upon request.
- What certifications does the valve carry?
- The Doebritz Grains Star Discharge Valve is CE marked, TÜV certified, and includes ATEX statements for Zone 20/21/22. Material certificates (EN 10204 3.1) and NDT reports are provided for full traceability.
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