Doebritz Chocolate Airlock Feeder | Quick-Clean Demountable Valve for Hygienic Processing
Doebritz Chocolate Airlock Feeder (DBR-1237) with 0.1-0.2mm rotor clearance, 316L mirror polish, CIP/SIP ready, ATEX Zone 20/21/22. OEM supply for confectionery & food lines.
Precision Hygienic Discharge for Confectionery Lines
Doebritz presents the DBR-1237 Chocolate Airlock Feeder – a quick-release rotary valve engineered specifically for high-value cocoa-based powders, chocolate mixes, and coated ingredients. Built on a heavy-duty 316L stainless steel platform with 0.1-0.2mm rotor-to-housing clearance, this airlock feeder delivers minimal air leakage (<0.4m³/h at 0.4bar differential) and absolute product integrity. Designed for 24/7 confectionery production, the Chocolate Airlock Feeder supports CIP cleaning, ATEX-certified explosion protection (Zone 20/21/22), and integrates seamlessly into lean manufacturing lines.
Why Plant Sourcing Chooses Doebritz Chocolate Airlock Feeder
Doebritz leverages German-engineered CNC machining centers to achieve radial tolerances unmatched in the food-grade rotary valve segment. Each Chocolate Airlock Feeder undergoes 100% leak testing and surface roughness verification (Ra≤0.4μm internal mirror finish). Key procurement advantages include:
- Fast-Track Quick-Release Demounting: No special tools – full rotor access under 3 minutes, reducing cleaning downtime by 70% vs traditional valves.
- Superior Airlock Efficiency: Precision-ground 8-vane rotor with 0.1mm tip clearance ensures leakage rate below 0.2 m³/h/kPa, critical for dense-phase chocolate powder conveying.
- ATEX Zone 20/21/22 Compliant: Flameproof construction with 16bar pressure shock resistance, anti-static bearings, and certified earthing.
- Direct OEM Supply Model: Doebritz controls all casting, machining, and assembly in-house – offering custom flanges (DIN/ANSI), FDA-grade seal materials, and 4-week lead time for non-standard configurations.
Housing, Rotor & Hygienic Engineering
The Chocolate Airlock Feeder features a one-piece 316L stainless steel housing with fully radiused internal corners – no crevices, no product trap zones. Rotor blades are CNC-machined from solid bar stock, then mirror-polished to Ra≤0.4μm. The shaft sealing system combines a lip-type air purge seal with a PTFE primary barrier, preventing chocolate oil migration into bearings. All product-contact surfaces are electropolished and passivated for corrosion resistance against acidic cocoa powders (pH 5.0–6.0). Optional water-cooled jackets maintain rotor temperature below 40°C for heat-sensitive chocolate blends.
| Parameter | Detail |
|---|---|
| Model Code | DBR-1237 (Gravity Quick-Release Series) |
| Body Material | SUS316L (standard), SUS304, or carbon steel with FDA-approved coating |
| Rotor Type | 8-vane closed / 10-vane open (chocolate powders), precision-ground clearance 0.1-0.2mm |
| Inlet/Outlet Flanges | DN100, DN150, DN200, DN250, DN300; DIN/ANSI custom |
| Max Differential Pressure | 1.0 bar (positive), -0.8 bar (vacuum) |
| Air Leakage (0.4bar diff) | ≤0.25 m³/h (standard), ≤0.12 m³/h (precision-graded) |
| Operating Temperature | -15°C to +80°C (ambient); 0°C to +110°C (material) |
| Surface Finish (Internal) | Mirror polish Ra≤0.4μm, electropolished (optional) |
| Cleaning Validation | CIP/SIP ready, WIP with manual inspection, quick-release teardown |
| ATEX Certification | Ex h IIB T4 Gb (Zone 20/21/22), explosion pressure rating 16bar |
| Drive Options | Direct gearmotor, VFD-ready, ATEX motor (IE3/IE4) |
| Weight (DN150) | ~78 kg (316L quick-release version) |
Technical Specifications – Doebritz DBR-1237 Chocolate Airlock Feeder
| Parameter | Value / Options |
|---|---|
| Model Code | DBR-1237 (Gravity Quick-Release Series) |
| Body Material | SUS316L (standard), SUS304, or carbon steel with FDA-approved coating |
| Rotor Type | 8-vane closed / 10-vane open (chocolate powders), precision-ground clearance 0.1-0.2mm |
| Inlet/Outlet Flanges | DN100, DN150, DN200, DN250, DN300; DIN/ANSI custom |
| Max Differential Pressure | 1.0 bar (positive), -0.8 bar (vacuum) |
| Air Leakage (0.4bar diff) | ≤0.25 m³/h (standard), ≤0.12 m³/h (precision-graded) |
| Operating Temperature | -15°C to +80°C (ambient); 0°C to +110°C (material) |
| Surface Finish (Internal) | Mirror polish Ra≤0.4μm, electropolished (optional) |
| Cleaning Validation | CIP/SIP ready, WIP with manual inspection, quick-release teardown |
| ATEX Certification | Ex h IIB T4 Gb (Zone 20/21/22), explosion pressure rating 16bar |
| Drive Options | Direct gearmotor, VFD-ready, ATEX motor (IE3/IE4) |
| Weight (DN150) | ~78 kg (316L quick-release version) |
Heavy-Duty Application Scenarios – Confectionery & Beyond
Chocolate & Cocoa Powder Airlock
The Doebritz Chocolate Airlock Feeder maintains strict containment of fine cocoa dust (<10μm particles). Its low-leakage design prevents pressure surges in pneumatic conveying lines that cause segregation of sugar-cocoa blends. Real-world data from a European chocolate refinery showed 92% reduction in line fouling after switching from a standard rotary valve to the DBR-1237.
Sanitary Continuous Mixing Lines
Mounted under a bulk bag unloader or day bin, the quick-release valve enables batch-to-batch changeover without cross-contamination. The no-tool rotor removal allows inspection and cleaning in under 10 minutes – verified by major GMP auditors.
Global OEM Assurance – Doebritz Factory Supply Chain
Doebritz operates a dedicated food-grade manufacturing cell with ISO 9001:2025, TÜV, and CE certifications. Every Chocolate Airlock Feeder includes:
- Full material mill certificates (EN 10204 3.1) – 316L traceable to melt
- Leakage test report recorded at 0.2 / 0.4 / 0.6 bar differential
- Surface roughness measurement (Ra) certificate for internal contacts
- ATEX certificate and installation manual (English + local languages)
Doebritz provides 3-year warranty on housing and rotor against wear in chocolate applications, plus global spare parts logistics (rotors, seals, bearings) shipped within 48 hours.
Frequently Asked Questions – Chocolate Airlock Feeder
- Can the Doebritz Chocolate Airlock Feeder handle high-fat cocoa powder that tends to pack?
- Yes. The DBR-1237 offers optional water-cooled end plates and housing to keep rotor surface temperature below 35°C, preventing fat migration and sticking. The precision clearance (0.1-0.2mm) naturally shears soft agglomerates without crushing.
- What is the maximum volumetric throughput for chocolate powder?
- For a DN150 model with 8-vane rotor at 25 RPM, typical fill density 0.45 kg/L yields 6.8 m³/h or ~3,000 kg/h. Higher capacities available with DN250/DN300 and VFD speed control up to 40 RPM.
- Is the valve validated for CIP without disassembly?
- Absolutely. The quick-release design includes CIP spray balls compatible ports (½” or ¾” NPT). With rotor spinning at low speed (5–10 RPM), CIP solution reaches all surfaces. Validation protocol available from Doebritz.
- Do you offer FDA-grade elastomers for the shaft seal?
- Yes. Standard is PTFE/Viton with air purge. Optional FDA-compliant silicone or EPDM can be supplied. Contact Doebritz sales to specify your chocolate product temperature and cleaning frequency.
- What is the lead time for a customized ATEX Chocolate Airlock Feeder?
- Standard DN100/150 quick-release with ATEX motor: 4-5 weeks ex-works. Fully customized flanges (ANSI 150#, special shaft extensions) add 2 weeks. Doebritz offers expedite service at 15% premium – 3 weeks.
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