Quick-Clean Demountable Valve: Doebritz Biscuits Airlock Feeder | Sanitary Processing Standard

Product Summary

Doebritz presents the Biscuits Airlock Feeder (Model DBR-1237), a quick-clean demountable rotary valve engineered specifically for sanitary bulk handling. Designed for gravity discharge and pneumatic conveying of fragile, sticky, or high-fat bakery products like biscuits, cookies, and cereals, this valve combines rapid tool-less disassembly with precision airlock sealing. The housing and rotor are CNC-machined from SUS316L stainless steel with an internal mirror finish (Ra≤0.4μm), eliminating dead zones and preventing cross-contamination. With rotor-to-housing clearance of 0.1-0.2mm, the Biscuits Airlock Feeder guarantees minimal air leakage (<0.4bar differential), ensuring stable pneumatic conveying and accurate batch metering. Available with CIP/WIP cleaning compatibility, ATEX Zone 20/21/22 certification, and customizable flanges (DIN/ANSI/HG20592), this valve is the choice for global food, pharmaceutical, and nutraceutical OEMs.

Why Plant Sourcing Chooses Doebritz Biscuits Airlock Feeder (Minimal Leakage)

Industrial buyers select the Doebritz Biscuits Airlock Feeder for its verifiable leak-tight performance and rapid sanitation turnaround. The valve maintains a consistent leakage rate below 0.5 m³/h at 0.4 bar differential, validated through in-house air leakage testing. Key procurement advantages include:

• Minimal Air Leakage: Precision-ground rotors and housings achieve 0.1-0.2mm radial clearance, reducing blowback and energy waste.
• Quick-Clean Demountable Design: No special tools required; full disassembly under 3 minutes, supporting manual cleaning, online CIP, or WIP protocols.
• Sanitary Processing Standard: Electropolished internal surfaces (Ra≤0.4μm), crevice-free construction, compliant with GMP and Class 100K/10K cleanroom requirements.
• Heavy-Duty CNC Precision: All rotors dynamically balanced and machined on Doebritz‘s 5-axis CNC centers, ensuring ≤0.05mm runout.
• Global OEM Supply: Doebritz provides full material traceability (EN 10204 3.1), pressure test reports, and ATEX certificates, supporting turnkey projects worldwide.

Housing & Rotor Engineering

The Biscuits Airlock Feeder features a split housing design with outboard bearings that isolate the product zone from the drive train. The rotor is available in 6, 8, or 10-vane configurations, with closed or open-end designs to handle sticky biscuit doughs and finished cookies without smearing. Shaft sealing employs lip seals with air purge (optional PTFE packing for high-temp applications), preventing dust migration to bearings. For abrasive applications (e.g., sugar coatings, salt biscuits), the housing and rotor can be coated with tungsten carbide or ceramic coatings, extending wear life by 3-5x. All castings are produced in Doebritz’s ISO 9001 foundry, with 100% non-destructive testing (NDT) on pressure-retaining components.

Technical Specifications

Below are the verified parameters for the Doebritz Biscuits Airlock Feeder (DBR-1237 series). Customizations available for flange drilling, inlet/outlet configurations, and motor mount positions.

Specification	Detail
Body Material	SUS304 / SUS316L / Carbon Steel (coated)
Rotor Design	6, 8, or 10-vane (closed or open-end)
Rotor-to-Housing Clearance	0.1 – 0.2 mm (CNC verified)
Shaft Seals	Lip seal with air purge / PTFE packing (optional)
Pressure Rating	Standard: 1 bar / Optional: 1.5 bar
Temperature Range (Product)	0°C to 120°C (higher with cooling/heating jacket)
Connections	DN50, DN100, DN150, DN200, DN300, DN350 (DIN/ANSI/HG20592)
ATEX Certification	Zone 20, 21, 22 (on request)
Surface Finish (Internal)	Mirror polish Ra≤0.4μm (food/pharma grade)
Cleaning Options	Manual quick-clean, CIP, WIP
Drive Options	Direct gearmotor, VFD ready, explosion-proof motor

Heavy-Duty Application Scenarios

Biscuit & Cookie Production Lines

Installed under storage hoppers or sifters, the Doebritz Biscuits Airlock Feeder meters whole biscuits, broken pieces, and dough crumbs into pneumatic conveying systems or mechanical elevators. The gentle rotor action minimizes breakage, while the quick-clean design enables rapid changeovers between product batches (e.g., chocolate-coated vs. plain biscuits).

High-Fat Bakery Ingredients

For handling high-oil powders (e.g., nut flours, cocoa, shortening blends), the optional water-cooled jacket prevents material heating and sticking inside the rotor pockets. The polished stainless surface and purged shaft seals eliminate product buildup and rancidity risks.

Sanitary Pneumatic Conveying

In dilute or dense phase systems, the Biscuits Airlock Feeder maintains system pressure stability with ≤0.2% leakage per bar differential. ATEX-certified versions (Zone 20/21) are available for handling combustible sugar dust or flour fines in explosive atmospheres.

Global OEM Assurance

Doebritz stands behind every Biscuits Airlock Feeder with full manufacturing transparency. Each valve undergoes:

• 100% dimensional inspection (CMM verified)
• Air leakage test at 0.4 bar (certificate provided)
• Material certs for all wetted parts (SUS316L traceable to mill)
• ATEX documentation for explosive zones
• Factory acceptance testing (FAT) prior to shipment

With a global logistics network and regional service centers, Doebritz offers 2-year warranty and 24/7 technical support for OEM accounts. Customizations—including special rotor profiles, carbon steel housings, or explosion-proof motors—are quoted within 48 hours.

Frequently Asked Questions

What is the maximum differential pressure for the Biscuits Airlock Feeder?

Standard design handles up to 1 bar (15 psi) differential. High-pressure version (optional) withstands 1.5 bar with reinforced bearings and advanced shaft seals.

Can the valve handle hot biscuits (120°C)?

Yes. The base design supports product temperatures up to 120°C. For higher temperatures (up to 250°C), specify the high-temp package with expanded graphite packing and water-cooled bearing pedestals.

How do I clean the valve without disassembly?

The Biscuits Airlock Feeder is CIP-ready. Connect the CIP nozzles (optional accessory) to circulate cleaning solutions through the housing while the rotor spins slowly. For full validation, we recommend periodic visual inspection via the access port.

Is the valve suitable for sticky dough?

Yes, but we recommend the PTFE-coated rotor or open-end rotor design with scrapers (optional). The mirror finish (Ra≤0.4μm) also reduces adhesion. For very sticky materials, a heated housing (to prevent condensation) is available.

What is the lead time for a custom flange pattern?

Standard flanges (DN100, DN150, DN200) ship within 2 weeks. Custom DIN/ANSI/Japanese flanges add 5-7 working days. Doebritz maintains a pre-machined housing stock for rapid customization.