ATEX Zone 20/21 Compliant Valve: Doebritz DBR-1237 | Certified Explosion Safety
Doebritz DBR-1237 ATEX Zone 20/21 rotary valve, certified explosion-proof. Featuring quick dismantling, CIP cleaning, SUS316L & tungsten carbide coatings for abrasive bulk solids.
ATEX-Certified Explosion Safety for Bulk Material Handling
The Doebritz DBR-1237 Quick-Release Rotary Valve is engineered for hazardous dust environments, meeting stringent ATEX Zone 20, 21, and 22 requirements. This certified airlock feeder combines explosion-proof construction with high-efficiency pneumatic conveying, delivering reliable service in high-risk powder processing applications across chemical, pharmaceutical, and food industries.
Designed with a pressure-resistant housing rated up to 16 bar and precision-maintained rotor-to-housing clearance of 0.1–0.2mm, the DBR-1237 effectively contains potential ignition sources while ensuring minimal air leakage. The flameproof design, coupled with ATEX-certified motors and optional tungsten carbide or ceramic coatings, provides comprehensive protection against dust explosions in demanding production environments.
Built for Hazardous Zone 20/21/22 Operations
The Doebritz DBR-1237 is certified for the full spectrum of ATEX dust zones, making it suitable for installations in silo discharge, pneumatic conveying, and dust collection systems handling combustible powders. Key safety features include:
- Explosion-Proof Housing: Robust cast construction tested to 16 bar explosion pressure resistance, containing potential deflagrations.
- Precision Clearance Control: 0.1–0.2 mm rotor-to-housing gap minimizes frictional heating and spark generation.
- ATEX-Certified Drive: Ex d or Ex e motors with thermal protection for safe operation in classified areas.
- Static Dissipation: Grounding provisions and anti-static rotor designs prevent electrostatic charge accumulation.
The DBR-1237’s flameless venting capability and integrated flame arrestor design ensure safe isolation of upstream and downstream equipment, preventing flame propagation in the event of an ignition.
Precision Engineering & Metallurgical Integrity
Manufactured under Doebritz’s rigorous quality management system, the DBR-1237 features precision-machined housing and rotor components crafted from premium materials. The valve body is available in SUS304, SUS316L, or carbon steel with durable coatings to withstand corrosive and abrasive materials. CNC-machined mating surfaces ensure leak-tight flanged connections in accordance with HG20592, DIN, or ANSI standards.
The rotor design incorporates outboard bearings for enhanced stability and extended bearing life under continuous heavy-duty operation. Shaft sealing is accomplished through a lip seal air-tight system that maintains process integrity while preventing product contamination. For applications requiring frequent cleaning, the quick-release design enables rapid disassembly without special tools, supporting CIP (Clean-in-Place) and WIP (Wash-in-Place) procedures.
Technical Specifications
The Doebritz DBR-1237 offers comprehensive specifications that support diverse industrial applications, from fine pharmaceutical powders to abrasive minerals and petrochemical pellets.
| Specification | Detail |
|---|---|
| Model | Doebritz DBR-1237 |
| Type | Quick-Release Rotary Valve / Airlock Feeder |
| Body Materials | SUS304, SUS316L, Carbon Steel Painted, Carbon Steel Nickel-Plated |
| Rotor Coatings | Tungsten Carbide, Ceramic, PE, PTFE, PA, Polymer Coating |
| Rotor-to-Housing Clearance | 0.1 – 0.2 mm |
| Shaft Seal | Lip Seal Air-Tight Seal |
| Flange Standard | HG20592 (DIN/ANSI options available) |
| Pressure Rating (ATEX) | 16 bar (Explosion-Proof Housing) |
| ATEX Certification | Zone 20, Zone 21, Zone 22 |
| Cleanroom Compliance | Class W, 10W, 30W, C, D |
| Temperature Range (Ambient) | -15°C to 60°C |
| Temperature Range (Material) | 0°C to 120°C |
| Optional Cooling | Water Cooling Jacket |
| Connections | DN50, DN100, DN150, DN200, DN300, DN350 |
| Cleaning Methods | Quick-Release Manual Cleaning, CIP, WIP |
| Control Options | VFD, PLC, Batch Metering, Recipe Metering |
| Certifications | CE, TÜV, Statement Certification |
For detailed dimensional drawings, performance curves, and pressure drop data, please consult the Doebritz engineering datasheet or contact our technical support team for custom application assistance.
Heavy-Duty Application Scenarios
Explosive Powder Pneumatic Conveying
When handling combustible materials such as carbon black, aluminum powder, or pharmaceutical intermediates, the DBR-1237 provides secure isolation between pressure differentials. The ATEX-certified housing and precision sealing ensure leak-free operation in both positive and negative pressure pneumatic conveying systems up to 1 bar.
Chemical & Petrochemical Processing
The valve is widely deployed in polyethylene, polypropylene, and PTA production lines where flameproof equipment is mandatory. Tungsten carbide-coated rotors withstand the abrasive nature of these polymers while maintaining accurate metering and feed rate control via VFD and PLC integration.
Pharmaceutical & Food Hygienic Lines
For processes requiring the highest sanitary standards, the DBR-1237 can be supplied with electropolished surfaces (Ra ≤ 0.4μm), FDA-compliant materials, and CIP-ready design. This configuration meets Class C/D cleanroom requirements and supports batch metering and recipe automation for antibiotic powders, vitamins, and probiotics.
Frequently Asked Questions
- What ATEX certifications does the Doebritz DBR-1237 carry?
- The DBR-1237 is certified for ATEX Zone 20 (dust) and Zone 21/22 applications, with housing pressure tested to 16 bar. Certification documents and test reports are available upon request.
- Can the valve be customized for specific flange standards?
- Yes, the DBR-1237 is available with HG20592, DIN, ANSI, and JIS flanged connections. Custom mating configurations can be accommodated based on project requirements.
- What materials are available for abrasive applications?
- For abrasive materials, the rotor and housing can be coated with tungsten carbide, ceramic, or polymer linings to extend wear life. SUS316L with electropolished finish is recommended for corrosive environments.
- How is the valve cleaned for product changeovers?
- The quick-release design enables rapid disassembly without tools for manual cleaning. CIP and WIP configurations are also available for automated cleaning cycles, reducing downtime.
- Is the Doebritz DBR-1237 suitable for variable speed metering?
- Yes, the valve is compatible with VFD and PLC control systems, providing precise flow rate adjustment for batch and continuous metering applications.
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