Chemical Powder Sifter, Doebritz Rotary Airlock Valve, ATX / High-Pressure Up to 3.5 Bar / Wear-Resistant Design

Product Summary

Engineered for precision powder metering and pressure-tight sealing, the Doebritz Chemical Powder Sifter (Rotary Airlock Valve) handles bulk densities from 0.3 to 2.5 kg/dm³ and achieves throughput capacities up to 350 m³/h. This ATEX-certified (Zone 22) rotary valve maintains differential pressures up to 3.5 bar while minimizing air leakage to just 0.01 m³/h. The Doebritz design excels with sticky chemicals, abrasive pigments, and cohesive fine powders — from calcium carbonate to lithium battery precursors.

Why Source Doebritz Chemical Powder Sifter

• Ultra-Low Air Leakage & High Airtightness: Precision-honed housing bores plus CNC-machined rotor tips achieve leakage rates < 0.003 m³/(h·cm²) at 1 bar differential — reducing energy waste and product loss in pneumatic conveying systems.
• Superior Wear Life: Hard-chrome plated or stellited rotor tips and replaceable tungsten-carbide-coated liners deliver 3–5x longer service life when handling abrasive powders (e.g., titanium dioxide, fumed silica).
• Genuine OEM Engineering Support: Every Doebritz Chemical Powder Sifter comes with 3D CAD models, customized flange drilling (ANSI/DIN/JIS), and optional purge-air ports for hygroscopic materials.
• ATEX & Hazardous Area Compliance: Certified for Zone 22 dust explosions (II 3D c T120°C) with grounding shunting rings and non-sparking rotor clearances as standard.
• Global Supply Chain Agility: Factory lead times 4–6 weeks for standard cast iron bodies, with expedite options available for stainless steel 316L pharmaceutical-grade sifters.

Housing & Rotor Engineering

The Doebritz Chemical Powder Sifter begins with a one-piece cast SG iron (GGG40) housing or investment-cast 316L stainless steel body. Internal surfaces are CNC-polished to Ra ≤ 0.8 µm, preventing material buildup. The rotor features an 8-vane open-end design with polyurethane-tipped blades for gentle product handling. Outboard bearing supports isolate the gearbox from product contact, while the labyrinth + double-lip seal arrangement guarantees zero shaft dusting. Optional nitrogen purge holes (16 x 2mm nozzles) actively prevent smearing of sticky chemical pastes.

Technical Specifications

All Doebritz Chemical Powder Sifters are hydrostatically tested at 1.5x max working pressure. Standard clearances are field-adjustable from 0.10–0.25 mm. Below data applies to Model DPS-200 (DN200 inlet). Contact engineering for larger DPS-300 to DPS-600 sizes.

Specification	Detail
Body Material	Cast Iron GGG40 / Stainless Steel 316L (optional)
Rotor Design	8-vane open rotor, hard-chrome plated (std) or Stellite 6-coated tips
Max Pressure Differential	3.5 bar (50 psi) – 7 bar optional with reinforced housing
Operating Temperature	-20°C to +220°C (standard), up to +450°C with high-temp option
Inlet/Outlet Size	DN100 to DN600 (4” to 24”) in ANSI / DIN / JIS
Air Leakage Rate	< 0.01 m³/h at 1 bar delta (measured on DN200)
ATEX Certification	II 3D c T120°C (Zone 22) – standard; gas EX available upon request
Connection Flanges	ANSI 150#, DIN PN10, JIS 10K or custom drilling pattern
Motor Power	0.75 kW to 11 kW, IE3 / IE4, inverter-ready
Surface Finish	Ra ≤ 0.8 µm (stainless steel), machined cast (iron)

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems (Dilute & Dense Phase)

Installed below storage silos or baghouse filters, the Doebritz Chemical Powder Sifter maintains system pressure while metering uniformly. Dense-phase conveying at 30 m/s seen with PVC powder, carbon black, and cement additives without bridging.

Reactor & Mixer Discharge

Chemical reactors (e.g., for catalysts, dyes, or battery powders) demand zero cross-contamination. The DPS series provides smooth gravity discharge with adjustable rotor speed (via inverter-ready motor) to match downstream extrusion or packing lines.

Dust Filter & Centrifugal Collector Airlock

Dust-laden air from grinding mills or spray dryers passes through cyclone separators; the Doebritz sifter seals the dust discharge hopper. The flap-free rotor design prevents jamming from fibrous or flake materials (e.g., mica, plastic regrind).

Frequently Asked Questions

Does Doebritz offer custom flange drilling and non-standard inlet/outlet sizes?

Yes — 100% non-standard supported. Doebritz engineering accepts drawings in DXF or PDF for ANSI 150#, DIN PN10, JIS 10K, or even special square/rectangular flanges. Minimum order quantity for custom flanges is 4 pieces.

What ATEX certifications are available for the Chemical Powder Sifter?

Standard Doebritz DPS series is ATEX II 3D c T120°C (Zone 22 for dust). For gas explosive atmospheres (Zone 2), we provide EX II 3G c T4. Full documentation including EU Declaration of Conformity and ignition hazard assessment is included.

Can the sifter handle high temperatures (above 200°C)?

Yes. With a high-temp carbon steel housing and Inconel rotor with advanced labyrinth seals, the Doebritz Chemical Powder Sifter works continuously up to 450°C. For temperatures up to 300°C, choose stainless steel 310 with graphite-impregnated packing seals.

What are the standard lead times, and do you offer after-sales spare parts globally?

Standard cast iron DPS valves: 4–5 weeks EXW Hamburg. Stainless steel 316L: 6–7 weeks. Emergency spare rotor, seals, and bearing kits are stocked in regional warehouses (Houston, Rotterdam, Shanghai) for next-day air shipment.

Is the Doebritz Chemical Powder Sifter compatible with FDA and cGMP requirements for food/pharma powders?

Absolutely — our DPS-PH variant features 316L mirror-polished contact parts, electropolished welds, quick-release clamps without pits or crevices, and full 3.1 material traceability. FDA-compliant silicone seals and validation documentation pack available.