Doebritz Protein Powder Airlock Feeder | ATEX Certified Rotary Valve for Food & Pharma
Doebritz protein powder airlock feeder with minimal air leakage, ATEX Zone 20/21, CNC machined rotors, and CIP-ready quick-release housing. Ideal for food and pharma. OEM supply.
Product Snapshot: Doebritz Protein Powder Airlock Feeder
The Doebritz Protein Powder Airlock Feeder (DBR-1237 series) is a heavy-duty, quick-release rotary valve engineered specifically for the hygienic, high-integrity handling of protein powders, dairy ingredients, and pharmaceutical excipients. Combining precision-engineered rotor-to-housing clearances of 0.1–0.2 mm with advanced shaft sealing, this airlock feeder guarantees minimal air leakage, consistent volumetric fill, and full containment—critical for high-value powders where cross-contamination and dust explosion risks are non-negotiable.
Why Source Doebritz Protein Powder Airlock Feeders
Choosing Doebritz means investing in process reliability, regulatory compliance, and lower total cost of ownership. Every airlock feeder is manufactured on state-of-the-art CNC machining centers, ensuring vane profiles and housing bores are produced to sub-millimeter tolerances. The result is a rotary valve that operates with exceptional volumetric efficiency and predictable leakage rates, even under differential pressures up to 1 bar (positive) and -1 bar (negative).
- Minimal Air Leakage & High Volumetric Efficiency: Our patented rotor clearance design reduces air bypass to <0.5 m³/h per bar, preserving pneumatic conveying pressure and reducing energy costs.
- ATEX & Hygiene Certification: Certified for Zone 20/21/22 dust explosion environments and supplied with FDA-compliant finishes for direct food contact. The DBR-1237 is designed for CIP and WIP cleaning protocols, meeting the strictest GMP and Class C/D cleanroom standards.
- Rapid Demountability for Sanitary Processing: The quick-release clamps and tool-less access allow full rotor and housing inspection in under 10 minutes, slashing downtime in multi-product lines.
- Hardened Material Options for Abrasive Proteins: For materials like whey, soy, or hydrolyzed proteins, we offer tungsten carbide-coated rotors and stainless steel 316L housings, providing exceptional wear resistance and service life.
Housing & Rotor Engineering
The DBR-1237 features a robust, one-piece cast housing available in SUS304, SUS316L, or carbon steel with anti-corrosion coatings. The rotor is precision-machined with 6, 8, or 12 vanes to match specific feed rate requirements. Outboard bearings are separated from the product zone via a dual-lip air purge seal arrangement, preventing contamination and enabling maintenance without disassembling the drive train. The housing interior is polished to Ra≤0.4 μm, eliminating dead zones where protein powders can accumulate and degrade.
Technical Specifications
Below are the core technical characteristics of the Doebritz DBR-1237 series Protein Powder Airlock Feeder. All parameters are verified during 100% factory testing, and custom configurations are available upon request.
| Specification | Detail |
|---|---|
| Model | DBR-1237 (Protein Powder Airlock Feeder) |
| Body Material | SUS304 / SUS316L / Carbon Steel (with coatings) |
| Rotor Design | 8-vane open rotor (6 or 12 vane optional) |
| Rotor-to-Housing Clearance | 0.1 – 0.2 mm (standard) |
| Shaft Sealing | Dual lip seal with air purge (lantern ring optional) |
| Pressure Rating | -1 bar to +1 bar (up to 16 bar flameproof) |
| Inlet Flange | DN100, DN150, DN200, DN300, DN350 (HG20592, DIN, ANSI) |
| Surface Finish (Internal) | Mirror polish Ra≤0.4 μm / 0.8 μm / 1.6 μm |
| Drive | VFD-ready, IEC motor, ATEX motor optional |
| ATEX Certification | Zone 20, 21, 22 (II 1/2 D c T100°C) |
| Cleaning | CIP-ready, quick-release for manual cleaning |
| Operating Temperature | Ambient -15°C to 60°C / Product 0°C to 120°C |
Heavy-Duty Application Scenarios for Protein Powders
Pneumatic Conveying Lines (Dilute & Dense Phase)
The airlock feeder seamlessly integrates into positive or negative pressure conveying systems, providing a stable, metered feed of protein powder from silos or day bins to filling stations, mixers, or packaging lines. The low-shear rotor geometry preserves powder particle integrity, while the precision clearances prevent blowback and material holdup.
Sanitary Batch Metering & Recipe Formulation
Equipped with a variable frequency drive (VFD) and PLC interface, the Doebritz airlock feeder supports gravimetric and volumetric batching with a repeatability of ±0.5%. It is the preferred choice for high-value nutritional supplements, infant formula, and pharmaceutical powder blending applications requiring strict recipe control and full traceability.
ATEX-Classified Dust Collection & Storage
Installed beneath cyclones, filters, or silos in protein processing plants, the flameproof housing design (rated 16 bar) and secondary seal system ensure safe operation in Zone 20/21 areas, effectively isolating potential ignition sources from the conveyed dust cloud.
Frequently Asked Questions
- What is the typical air leakage rate for the Doebritz protein powder airlock feeder?
- With standard rotor-to-housing clearance of 0.1–0.2 mm, the leakage rate is typically below 0.5 m³/h per bar of differential pressure. This can be further reduced with optional precision-grounded rotors or purge air systems for highly sensitive dense-phase applications.
- Can the Doebritz airlock feeder handle sticky or hygroscopic protein powders?
- Yes. We offer polished stainless steel internals (Ra≤0.4 μm), optional PTFE or polymer coatings, and heated/water-cooled jackets to prevent material build-up or caking. The quick-release design also allows for fast, thorough manual or CIP cleaning between batches.
- Is the DBR-1237 series compliant with FDA and GMP regulations?
- Absolutely. All food-contact materials are FDA-compliant, and the design follows EHEDG guidelines. The valve can be supplied with full material certificates (EN 10204 3.1), surface roughness reports, and sanitary design documentation to support regulatory audits.
- What drive options are available for the protein powder airlock feeder?
- We offer IEC-standard motor mounts (direct or side drive), washdown-duty motors, inverter-ready motors, and ATEX-certified explosion-proof motors. Gearbox configurations include helical-bevel, worm-gear, or planetary drives, all selected to match your specific torque and speed requirements.
- How do I select the correct valve size for my conveying capacity?
- Our engineering team provides free sizing assistance based on your material density, conveying rate (kg/h), pressure conditions, and rotational speed. Standard inlet flange sizes range from DN100 to DN350, with custom patterns available to match your existing piping.
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