Side-entry Rotary Valve, Doebritz Heavy-Duty Airlock, Cast Iron / ATEX Certified for Explosive Dusts

Product Summary

Doebritz side-entry rotary valves are heavy-duty airlocks engineered for metering and sealing powders, granules, and flake materials under differential pressure. Capacities from 0.5 to 80 m³/h, pressure rating up to 3.5 bar (g), ATEX certified for dust explosion zones 20/21/22. Designed for minimal air leakage (<0.02% differential pressure) and extended service life in continuous-duty pneumatic conveying and dust collection systems.

Why Source Doebritz Side-entry Rotary Valves

• OEM Supply Chain Expertise: 15+ years supplying global heavy industries with precision-engineered rotary valves. Full CNC machining center and in-house CMM inspection.
• Ultra-low Air Leakage: Proprietary tip clearance control (≤0.10mm) and pre-loaded PTFE or metal seals reduce blow-by, saving energy and preserving conveying pressure.
• Explosion-proof Ready: All Doebritz side-entry models are ATEX certified (II 2D Ex h IIIC T120°C) and available with flameproof construction and grounding kits.
• Customization for Harsh Materials: Abrasion-resistant hardfacing, 316L stainless steel, polished food-grade finish, or coated rotors for sticky products.
• Global Spare Parts & 48h Quotation: Fast-response technical team, 3D CAD models for integration, and same-day pricing for non-std flanges (DIN/ANSI/JIS).

Housing & Rotor Engineering

The Doebritz side-entry valve features a one-piece cast iron or 316L stainless steel housing with integrally cast clean-out covers for easy maintenance. The side-entry shaft configuration isolates bearings from the product zone – outboard bearing housings prevent contamination and allow high-temperature operation (up to 280°C). Rotor types include 6, 8, 10, or 12 vanes, with closed-end, open-end, or adjustable-tip designs. All rotors are dynamically balanced and CNC-machined to ensure concentricity 50,000 hours in abrasive applications.

Technical Specifications

Doebritz side-entry rotary valves meet ISO 9001:2015 and ATEX 2014/34/EU. Below are standard configurations – custom sizes and materials available.

Specification	Detail
Body Material	Cast Iron EN-GJL-250 / Stainless Steel 304 or 316L
Rotor Design	8-vane open rotor, dynamically balanced
Inlet/Outlet Size	DN150 to DN600 (6′ to 24′)
Max Pressure	3.5 bar (g) differential
Max Temp (Std)	-20°C to +150°C (PTFE seals)
Leakage Rate	<0.02% @ 1 bar differential
Drive Option	Direct coupled or chain-sprocket with gearmotor
ATEX Certification	II 2D Ex h IIIC T120°C (dust)
Finish	Epoxy primer + polyurethane topcoat / food-grade polished

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Used as feeder and airlock in dilute or dense phase pneumatic conveyors for cement, fly ash, plastic pellets, and minerals. The side-entry design allows continuous operation at pressure differentials up to 3.5 bar without jamming.

Silo Discharging & Gravity Flow

Mounted under silos, bins, or hoppers to control discharge of dry bulk solids. Optional variable-frequency drive (VFD) metering ensures consistent mass flow to downstream mixers or packaging lines.

Dust Filter Collectors & Cyclones

Installed at the outlet of dust collectors or cyclones to maintain negative pressure while discharging collected dust or powder. ATEX-certified models safely handle flammable dusts like sugar, wood, coal, or chemical powders.

Frequently Asked Questions

1. What is the lead time for a Doebritz side-entry rotary valve?

Standard sizes (DN150 to DN400) in cast iron ship within 4 weeks. Stainless steel or ATEX-certified valves with special rotors require 6-8 weeks. Rush assembly (2-week) available for OEM partners.

2. Do you support non-standard flange drilling?

Yes. We manufacture to DIN, ANSI 150/300#, JIS, and custom bolt hole patterns. Minimum order quantity for non-standard flanges is 5 pieces. Provide your drawing or mating flange dimensions.

3. Is your ATEX certificate valid for gas and dust?

Doebritz side-entry valves are ATEX certified for dust explosions (II 2D). For gas environments (II 2G) we offer special sealing and purge options. Contact us with your zone classification.

4. What is the maximum operating temperature?

Standard PTFE seals: -20°C to +150°C. High-temperature configuration with graphite seals and air-cooled spacer: up to 280°C. For >300°C, specify our water-cooled housing design.

5. Can the rotor be replaced without removing the housing?

Yes. The Doebritz side-entry design includes removable end plates that allow full rotor extraction from the side without disconnecting pipe flanges – reducing maintenance downtime by over 70% compared to drop-through valves.