Doebritz Rotary Valve, Drop-Through Airlock Valve, Cast Iron / ATEX Certified for Pneumatic Conveying
Doebritz heavy-duty rotary valves feature ≤2ml/m air leakage, ATEX certified, and CNC precision. OEM drop-through design for powders & granules. Request a quote!
Product Summary
Engineered for extreme dust control and metering precision, the Doebritz Drop-Through Rotary Valve delivers reliable airlock sealing for dry bulk solids. Capacities up to 50 m³/h and pressure differentials up to 1.5 bar (21.7 psi). Designed for abrasive powders, pellets, granules, and irregular flakes. ATEX-certified explosion-proof construction for Zone 21/22 dust environments. Built from heavy-duty cast iron or SS304/316L with replaceable wear liners.
Why Source Doebritz Rotary Valve
- Ultra-low Air Leakage ≤2ml/m: Precision-honed housing and tip-clearance control reduce product degradation and system backpressure, cutting energy costs by up to 12%.
- CNC-Machined Rotor & Housing: Every Doebritz rotor is dynamically balanced and CNC-finished for consistent clearance (0.10-0.20mm), ensuring long-term sealing efficiency in pneumatic dilute-phase or dense-phase systems.
- ATEX Zone 21/22 Certified: Full documentation and certified construction with grounding brushes, anti-static seals, and spark-resistant rotor options – direct compliance for global projects.
- Global OEM Supply & Fast Customization: Same-day DFM drawings for non-standard flanges (ANSI, DIN, JIS), variable outlet ports, and hardfacing coatings. 15-day lead time for standard sizes.
Housing & Rotor Engineering
The Doebritz Rotary Valve housing is cast from high-grade GG25 cast iron or 304L stainless steel, with integrated inspection ports. Robust end covers with outboard taper roller bearings isolate the product zone from lubricants. The 8-vane closed rotor design is machined on 5-axis CNC centers, achieving a surface finish of Ra ≤1.6 μm. Optional hard-wear tips (Stellite® or tungsten carbide) for silica sand or cement applications. Deflector vanes prevent material jamming and shear damage. The purgeable rotor shaft seal system uses PTFE lip + air-purge connections for 200°C (392°F) service.
Technical Specifications
All parameters based on factory acceptance tests (FAT) per ISO 9001:2015. Custom configurations available for high-temperature, food-grade, or ATEX/IECEx environments. Standard clearances tested at 0.8 bar pressure difference.
| Specification | Detail |
|---|---|
| Body Material | Cast Iron GG25 / Stainless Steel 304L / 316L |
| Rotor Design | 8-Vane Closed Rotor, CNC Machined, Open or Fixed Tips |
| Inlet/Outlet Size | DN150 to DN500 (6′ to 20′) |
| Capacity | Up to 50 m³/h (standard), 90 m³/h (high-capacity) |
| Pressure Differential | 1.5 bar max (21.7 psi) |
| Air Leakage Rate | ≤2 ml/m per 10 mbar pressure (tested) |
| Temperature Range | -20°C to +200°C (higher with custom seals) |
| Mounting | Drop-Through (DT) or Blow-Through (BT) |
| Certifications | ATEX Zone 21/22, CE, GOST-R, ISO 9001 |
Heavy-Duty Application Scenarios
Pneumatic Conveying Systems
Doebritz rotary valves act as pressure-tight airlocks for dilute-phase or dense-phase pneumatic transfer of plastic resins, cement, and fly ash. Minimal leakage preserves blower efficiency and prevents line plugging.
Silo Discharging & Feeding
Mount directly under silos or bins for metered discharge of lime, carbon black, or food ingredients. Variable frequency drive (VFD) ready for precise volumetric feeding.
Dust Collection & Filter Receivers
Explosion-proof design for dust collector hopper discharge in woodworking, metal grinding, and chemical plants. High-pressure integrity up to 0.5 bar differential.
Frequently Asked Questions
- What is the standard lead time for a Doebritz Rotary Valve?
- Standard sizes (DN150 to DN400) in cast iron with Buna-N seals ship within 15 working days. Stainless steel or ATEX-certified versions require 20-25 days. Expedited 7-day service available for emergency OEM replacements.
- Can Doebritz provide non-standard flanges or custom inlet/outlet configurations?
- Yes, our engineering team supports ANSI #150/#300, DIN PN10/16, JIS 10K, and custom drilling patterns. Also offer square-to-round adapters and offset outlets without extra lead time for volume orders.
- Is the valve ATEX certified for both gas and dust?
- Doebritz offers Zone 21 (dust) and Zone 2 (gas) ATEX certifications. Full EC-Type Examination Certificate (Module B) and Production Quality Assurance (Module D) can be provided. Add housing grounding and conductive seals for explosive environments.
- What maximum temperature can the Doebritz rotary valve withstand?
- Standard nitrile seals: -20°C to +80°C. High-temp option: Viton® or silicone seals up to 200°C. For 350°C+ applications, specify graphite-laminate packing with extended housing cooling fins (custom engineering required).
- How do you control air leakage and rotor tip wear?
- Every Doebritz valve undergoes individual air-leakage testing (≤2 ml/m per 10mbar pressure). Replaceable stator wear plates or hard-chrome plated rotor tips are offered for highly abrasive materials like alumina or clinker.
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