Easy-clean Rotary Valve, Doebritz Airlock, ATEX Certified / Minimal Air Leakage

Product Summary

The Doebritz Easy-clean Rotary Valve is a heavy-duty airlock feeder engineered for continuous operation under differential pressure up to 3.5 bar. Designed for powders, granules, and flaky materials, this ATEX-certified valve delivers minimal air leakage (<0.1 m³/h at 1 bar) and supports capacities from 5 to 500 m³/h. The patented split housing with quick-release clamps reduces cleaning time by 60% compared to standard rotary valves, making it the preferred choice for food-grade, chemical, and hygienic processing lines.

Why Source Doebritz Easy-clean Rotary Valves

• OEM-Grade CNC Precision: Every rotor is dynamically balanced on a 5-axis CNC machining center, ensuring rotor-to-housing clearance as tight as 0.08mm – reducing air leakage and power consumption.
• Hygienic & Easy Maintenance: The tool-free end cover removal and pull-out rotor design allow full access for CIP/SIP cleaning without uninstalling the valve body.
• Explosion-Proof Compliance: Full ATEX II 2D/2G certification with grounding shaft and anti-static seals, safe for dust explosion zones 21 and 22.
• Global Supply Chain Advantage: Doebritz stocks finished bores and flanges in both EN 1092-1 (PN10/PN16) and ASME B16.5 (150#) standards, enabling 7-day shipment for standard sizes.
• Non-Standard Customization: We accept non-standard inlet/outlet configurations, stainless steel 316L housing, hard chrome-plated rotor, and high-temperature seals up to 400°C.

Housing & Rotor Engineering

The one-piece cast iron or SS316L housing is stress-relieved and shot-blasted to eliminate porosity, ensuring zero material hang-up. The Easy-clean rotor features a proprietary open-end vane design with swept-back edges, preventing material compaction and bridging. Outboard-mounted heavy-duty bearings with labyrinth seals isolate the gearbox from the product zone, extending service life to over 20,000 running hours under abrasive conditions. Optional hard-facing on rotor tips provides 3x wear resistance for carbon black or alumina handling.

Technical Specifications

All Doebritz Easy-clean Rotary Valves are factory pressure-tested and certified before delivery. The table below lists standard configurations; non-standard dimensions and materials are available upon request.

Specification	Detail
Body Material	Cast Iron GG25 / Stainless Steel 304 / 316L
Rotor Design	8-Vane Open End, swept-edge (Easy-clean)
Clearance	0.08mm – 0.15mm (adjustable)
Pressure Range	-0.5 bar to +3.5 bar
Temperature Range	-20°C to +400°C (seal dependent)
ATEX Certification	II 2D c T130°C (optionally II 2G)
Flange Standards	EN 1092-1 PN10/PN16, ASME B16.5 150#
Sizes (DN/inches)	DN100 to DN600 (4” to 24”)
Drive Options	Direct coupled gearmotor, chain-sprocket, inverter ready

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Installed under silos or hoppers, the Doebritz Easy-clean valve acts as both a feeder and airlock, maintaining system pressure while metering material into dilute or dense phase conveying lines. The minimal air leakage ensures lower compressor energy costs and stable conveying velocity.

Silo Discharging & Dust Filter Collectors

For continuous bottom unloading of cement, lime, or plastic pellets, the valve’s high volumetric efficiency (up to 92%) prevents flow starvation. When mounted on dust collectors or cyclones, it provides reliable dust discharge while maintaining differential pressure across the filter bags.

Frequently Asked Questions

What is the maximum working temperature for the Doebritz Easy-clean rotary valve?

Standard Viton seals handle up to 200°C. For higher temperatures, we offer silicone (250°C) or graphite (400°C) seals. The housing and rotor are designed to accommodate thermal expansion without jamming.

Can you supply non-standard inlet flanges or square inlets?

Yes. Doebritz specializes in custom flanges (square, rectangular, offset, or any drilling pattern). Minimum order quantity for non-standard flanges is 5 pieces, with lead time 3-4 weeks. Please provide your flange drawing for a quotation.

Is the Easy-clean valve ATEX certified for dust zones?

Absolutely. All Doebritz rotary valves are available with ATEX II 2D for dust zones 21 and 22, optionally II 2G for gas zones 1 and 2. Certification includes anti-static seal material and earthing device.

What is the typical lead time for standard sizes?

Our standard DN150 to DN400 (6 to 16 inch) valves with cast iron housing are shipped within 7-10 working days. Stainless steel versions require 15 working days. Express assembly available for a 20% rush fee.

How do you verify rotor-to-housing clearance before shipping?

We perform a dry run leakage test using a calibrated flow meter at 1 bar differential pressure. Each valve comes with a signed test certificate showing measured leakage rate (guaranteed ≤0.1 m³/h for standard clearance models).