Sanitary Quick-Cleaning Rotary Valve, Doebritz Airlock, 316L Stainless / CIP / ATEX

Product Summary

Doebritz Sanitary Quick-Cleaning Rotary Valve is engineered for hygienic powder, granule, and flake material handling in food, pharmaceutical, and fine chemical industries. Discharge capacity up to 45 m³/h (depending on rotor speed & differential pressure), ATEX certified for dust explosion safety (Zone 20/21). CIP-ready with quick-opening access covers and tool-free rotor removal dramatically reduces cleaning downtime. Leakage rate below 20 ppm pressure differential ensures superior airlock sealing for pneumatic conveying or gravimetric feeding.

Why Source Doebritz Sanitary Rotary Valves

• Ultra-long bearing life: Outboard-mounted heavy-duty bearings with triple lip seals and purge ports – live steam or compressed air purging prevents material ingress, achieving >50,000 hours MTBF.
• Minimal air leakage: Precision-machined housing bores and rotor tips achieve radial clearance down to 0.10–0.15 mm; optional PTFE or metal rotor tips for even tighter sealing (down to 0.05 mm).
• ATEX certified explosion-proof: Full ATEX II 2D Ex h IIIC T100°C Db for dust environments; also available with FD/EM stop flange and grounding continuity.
• Quick clean & inspection: Clamp-type front cover (or swing-away design) allows full access to rotor and housing without removing pipeline connections – FDA-compliant surface finish <Ra 0.8 μm.
• Global OEM supply capability: Doebritz delivers 120+ units/month with full material certs 3.1, NDT reports, and FAT/SAT protocols. We support custom flanges (DIN/ANSI/JIS) and polished to <Ra 0.4 μm for sticky products.

Housing & Rotor Engineering

The Doebritz sanitary rotary valve is built from investment-cast 316L stainless steel (or 304 upon request), with fully radiused internal corners eliminating product trap zones. Housing ends are precision-machined to guarantee concentricity for consistent tip clearance. Rotor design options:

• Open rotor (8 or 10 vanes): Ideal for free-flowing powders and granules, provides maximum volumetric efficiency.
• Semi-closed rotor: Reduces air leakage for pressure differential up to 0.5 bar, suited for dense phase conveying.
• Chamfered leading edges & polished pockets: Prevents material wedging and crushing of friable or sticky product (e.g., whey powder, spices, activated carbon).

All Doebritz sanitary valves feature outboard bearing pedestals completely isolated from product zone by two independent lip seals and a labyrinth seal. An optional purge port between seals allows dry air or steam barrier to sterilize bearing cavity. Drive connection via slotted hollow shaft eliminates direct product-to-shaft contact, meeting EHEDG guidelines.

Technical Specifications

Below are standard ratings for Doebritz Sanitary Quick-Cleaning Rotary Valve – custom configurations available upon request (temperature up to 250°C, higher pressure differential).

Specification	Detail
Valve Type	Sanitary quick-cleaning rotary airlock / feeder
Body Material	Investment-cast 316L stainless steel (Ra<0.8 μm)	Rotor Design	8-vane open rotor (standard); semi-closed / 10-vane optional
Inlet / Outlet Size	DN150, DN200, DN250, DN300 (customizable ends)
Pressure Differential	Max. 0.5 bar (standard) with <20 ppm leakage; 1.0 bar with mechanical seals
Temperature Range	-20°C to +150°C (silicone); up to 260°C with FFKM + purge
ATEX Classification	II 2D Ex h IIIC T100°C Db (dust)
Bearing Type	Outboard heavy-duty double row angular contact, grease lubricated, purge ports
Quick Cleaning	Clamp-type front cover, tool-free rotor removal, CIP nozzles optional
Drive Connection	Hollow shaft with motor mounting flange, IEC / NEMA adaptable

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Doebritz sanitary valve serves as airlock feeder in dilute and dense phase pneumatic conveying lines for sugar, flour, milk powder, plastic pellets. Low leakage ensures system pressure stability and reduces energy consumption of blower/compressor.

Silo Discharging & Metering

When mounted under bulk silos or hoppers, the variable-frequency-drive-ready rotor provides accurate volumetric dosing (±2% deviation). Quick-clean design allows fast product changeover without entering the silo.

Dust Filter & Cyclone Discharge

As a dust collector rotary airlock, the valve maintains seal under vacuum up to -0.8 bar. ATEX version available for explosive dusts like starch, wood dust, pharmaceutical actives.

Frequently Asked Questions

What is the typical lead time for Doebritz sanitary rotary valves?

Standard sizes (DN150–DN300) in 316L with FDA seals are stocked and ship within 10 working days. For custom rotor types, special coatings (PTFE, tungsten carbide), or non-standard flanges, lead time is 25–30 working days after drawing approval.

Can you produce non-standard flanges or special inlet/outlet configurations?

Yes, Doebritz supports customer-specific flanges: DIN EN 1092-1, ANSI B16.5 150#/300#, JIS 10K/20K. We also offer rectangular inlet for hopper direct mount, or square-to-round transition. Minimum order quantity for custom flanges is 5 units.

Do you provide ATEX certificate and explosion-proof documentation?

Absolutely. Every Doebritz sanitary valve intended for explosive atmosphere is supplied with EC-type examination certificate (notified body number included), installation drawing with earthing instructions, and declaration of conformity to ATEX Directive 2014/34/EU. We also support IECEx certification on request.

What high-temperature options are available for hot product or CIP with steam?

Standard seals are FDA silicone (‑20°C to +150°C). For higher temperature: Viton® (160°C), FFKM (250°C), or graphite-impregnated PTFE (260°C). Housing can be equipped with electric heat tracing or steam jacket to prevent product condensation. Bearing purge with compressed air keeps bearings cool up to 200°C product temp.

How do you ensure minimal air leakage in pressure differential applications?

Doebritz achieves tight sealing through multiple strategies: (1) CNC-machined housing bore with roundness 0.5 bar. Leakage rates are verified by factory test (differential pressure 0.2 up to 1.0 bar) and reported in inspection record.