Heavy-Duty Rotary Airlock Valve, Doebritz Industrial Feeder, 40 m³/h / ATEX Certified

Product Summary

Doebritz presents the next-generation Heavy-Duty Rotary Airlock Valve – engineered for continuous metering and pressure-tight sealing in demanding bulk solids transfer. Capacity up to 40 m³/h (model-dependent), withstanding differential pressure up to 1.5 bar. Certified for ATEX Zone 21/22 and suitable for fine powders, granules, pellets, and even fibrous flakes. The robust cast housing and precision-ground rotor guarantee minimal air leakage and maximum wear resistance in cement, chemical, and steel plants.

Why Source Doebritz Heavy-Duty Rotary Airlock Valves

Global OEM suppliers and plant engineers choose Doebritz for uncompromised reliability and lifecycle cost reduction. Our competitive edge comes from German-inspired engineering and rigorous quality control:

• Ultra-Low Air Leakage: Precision-machined rotor-to-housing clearance as tight as 0.1 mm, achieving <2 cc/rev leakage rate for superior pressure drop control.
• Extended Bearing Life: True outboard bearing arrangement with heavy-duty spherical roller bearings – isolated from material flow, rated for >100,000 hours L10 life.
• ATEX Certified Explosion-Proof: Full compliance with 2014/34/EU, including grounded rotor and anti-static seals for hazardous dust environments.
• Global Supply Chain & Short Lead Times: Inventory hubs in Houston, Rotterdam, and Shanghai; standard models ship within 2 weeks, custom flanges and rotors in 4-6 weeks.
• 100% CNC Machined Housing: Every casting is digitized and finish-machined on 5-axis CNC centers, ensuring perfect concentricity and repeatable seal performance.

Housing & Rotor Engineering

The Doebritz Heavy-Duty Rotary Airlock Valve starts with a one-piece cast housing in GGG 40 ductile iron or SS 316L for corrosive applications. Internal surfaces are spark-tested and finished to Ra ≤ 0.8 µm. The rotor features an adjustable open-ended vane design with hard-chrome plated edges to prevent jamming from sticky materials. For abrasive powders, we offer a closed rotor (shrouded vane) configuration with replaceable wear tips. All models include external bearings supported by a heavy-duty yoke, eliminating any contact between bearing seals and conveyed material. A four-point adjustable gland packing or mechanical seal (optional) provides dynamic shaft sealing with zero fugitive emission.

Technical Specifications

Below are the baseline parameters for our standard heavy-duty series. Custom bores, flange drilling patterns (ANSI, DIN, JIS), and special rotor coatings (Tungsten Carbide, PTFE) are available upon request.

Specification	Detail
Body Material	Ductile Cast Iron GGG 40 (Std) / SS 316L (Opt)
Rotor Design	8-Vane Open Rotor (Std) / Closed Shrouded Rotor (Opt)
Inlet/Outlet Size	150 mm to 600 mm (6” to 24”)
Max Differential Pressure	1.5 bar (21.7 psi)
Max Feed Rate	40 m³/h (for 300 mm model)
Operating Temperature	-20°C to +250°C (Std) / up to +450°C (Opt)
ATEX Certification	II 2D c T120°C (Zone 21/22)
Bearing Type	Outboard spherical roller, L10 >100,000 hrs

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems (Dilute & Dense Phase)

Integrates seamlessly as a rotary feeder or airlock under positive or negative pressure. Maintains system vacuum while delivering consistent material flow to conveying lines.

Silo Discharging & Bin Vent Filter Collectors

Mounted below silos, cyclones, or dust collectors to prevent air short-circuiting while ensuring continuous dust or product discharge. Ideal for cement, lime, and fly ash.

Metering into Mills, Mixers, and Reactors

Precise volumetric feeding of additives, pigments, or plastic pellets into batch or continuous processes. Can be paired with a variable frequency drive for flow control.

Frequently Asked Questions

Q1: What is the maximum operating temperature for the Doebritz heavy-duty rotary valve?

Standard models operate from -20°C to +250°C (with high-temp graphite seals). For +250°C to +450°C, we offer an air-cooled housing extension and stainless steel rotor. Please specify your process temperature when requesting a quote.

Q2: Can you customize flange drilling patterns or inlet/outlet sizes?

Yes – Doebritz provides full non-standard customization. We support ANSI 150#, DIN PN10/PN16, and JIS 10K. We also offer square-to-round adapters and oversized cleanout ports for food/pharma grades.

Q3: Do you provide ATEX certification documents for the entire assembly?

Absolutely. Each Doebritz valve supplied with ATEX conformity includes a Declaration of Conformity, EC-Type Examination Certificate (for Zone 21/22), and a supplementary instruction manual for safe installation in explosive atmospheres.

Q4: What is the typical lead time for an order of 10 units?

For standard cast iron models (6- or 8-vane), lead time is 15-20 working days. For stainless steel or with special coatings, 25-30 days. We offer expedited production for emergency breakdowns – contact our OEM desk.

Q5: How do I select between open rotor and closed rotor design?

Open rotor is best for free-flowing powders and granules with low abrasion. Closed rotor (shrouded) is mandatory for abrasive materials (e.g., alumina, silica) or when high differential pressure >0.8 bar exists, as it reduces wear and pressure loss across the rotor.