Sanitary ATEX Quick-Clean Valve: Doebritz SUS316L Airlock Feeder | Hygienic CIP/SIP Ready

High-Performance Sanitary Airlock Feeder for Critical Processing Lines

Engineered specifically for pharmaceutical, food, and high-purity chemical applications, the Doebritz SUS316L Airlock Feeder delivers exceptional product containment with rapid sanitation capability. This quick-release demountable valve maintains 0.1-0.2mm rotor-to-housing clearance, achieving minimal air leakage (≤0.005 m³/h at 0.6 bar differential) while meeting strict GMP and ATEX Zone 20/21 requirements. Doebritz precision CNC machining ensures consistent clearances across all DN50-DN350 flanged connections.

Why Plant Engineers Choose Doebritz SUS316L Quick-Release Airlock

Traditional rotary valves require extended downtime for cleaning and maintenance. The Doebritz SUS316L Airlock Feeder features tool-free demountable housing access, reducing strip-down time from hours to under 15 minutes. Key operational advantages:

• Sanitary Compliance: Ra≤0.4μm mirror-finished internal surfaces eliminate bacterial harborage points, fully CIP/SIP compatible.
• ATEX Zone 20/21 Certified: Flameproof construction with 16bar pressure containment, explosion-proof motor integration, and precision gap engineered for dust explosion isolation.
• Superior Airtight Performance: Lip seal with air purge configuration maintains <0.2% leakage rate even under high differential pressure (up to 1 bar positive or -1 bar vacuum).
• Direct Drive Efficiency: VFD-ready gearmotor coupling enables precise volumetric feeding from 0.5 to 50 m³/h without product degradation.

Precision Metallurgy & Hygienic Surface Engineering

The Doebritz SUS316L Airlock Feeder utilizes full-audit traceable 316L stainless steel (1.4404) for all product-contact components, with optional electropolished or tungsten carbide-coated surfaces for abrasive pharmaceutical excipients. Critical engineering specifications:

• Housing: Investment-cast 316L, hydrostatically tested to 1.5x working pressure.
• Rotor Configuration: 6, 8, or 12-vane open or closed rotor options, dynamically balanced to ISO 1940 G6.3.
• Shaft Sealing: Triple-lip PTFE seals with inert gas purge port (0.2-0.5 bar N2 or compressed air).
• Quick-Release Clamps: Stainless steel over-center toggle clamps or swing bolts on DN150+ sizes.

Technical Specifications – Doebritz SUS316L Airlock Feeder

Specification	Detail
Body / Rotor Material	SUS316L (1.4404) stainless steel, electropolished Ra≤0.4μm (product-contact)
Rotor Design	8-vane closed rotor (standard), 6 or 12-vane optional
Rotor-to-Housing Radial Gap	0.1mm – 0.2mm (CNC precision matched)
Shaft Seal Type	Triple-lip PTFE with inert gas purge (0.2-0.5 bar)
Max Differential Pressure	1 bar positive / -1 bar vacuum (16bar housing burst rating)
ATEX Classification	II 1/2 D c T120°C (Zone 20/21) – Flameproof construction
Connection Standards	HG20592 (standard), DIN/ANSI flanges optional, DN50 to DN350
Temperature Range	-15°C to +60°C ambient / 0°C to +120°C product (water jacket optional)
Cleanability	Quick-release manual cleaning / Online CIP & WIP + manual inspection
Certifications	CE, ATEX, TÜV NORD, FDA 21 CFR compliant elastomers, EHEDG design

Critical Processing Applications

Pharmaceutical API & Excipient Handling

Approved for direct-contact handling of antibiotic powders, vitamin blends, lyophilized vaccine powders, and probiotic formulations. The smooth internal geometry prevents material hang-up while the quick-release design supports rapid product changeover.

Food Grade Powder & Granule Transfer

Ideal for奶粉 (milk powder), protein isolates, cocoa, spices, and bakery premixes. USDA-dairy accepted models available with 3A sanitary compliant finishes.

Hazardous Dust Applications

ATEX Zone 20 certified housing combined with earth-bonded rotor and explosion venting options ensures safe handling of aluminum powder, lithium battery materials, and fine chemical dusts.

Global OEM Supply & Certification Assurance

Every Doebritz SUS316L Airlock Feeder ships with full EN 10204 3.1 material certificates, surface roughness reports, and pressure test documentation. Compliance portfolio: CE Mark, ATEX 2014/34/EU (II 1/2 D c T120°C), TÜV NORD certified, FDA 21 CFR compliant elastomers, EHEDG design recommendations.

What is the standard delivery lead time for custom flange configurations?

Standard DIN/ANSI flanged DN50-DN200 units ship within 10-15 working days. Custom DN300+, special materials, or ATEX Zone 20 certified valves require 25-30 working days from order confirmation.

Can the Doebritz SUS316L Airlock Feeder handle sticky or moist materials?

Yes. Order with polished rotor tips (<0.2μm Ra), optional PTFE coating, and heated housing jacket (electric or steam) to prevent adhesion of hygroscopic powders or high-fat food ingredients.

What spare parts should I stock for preventive maintenance?

Recommended stock per valve: one set of lip seals (upper/lower), bearing cartridge assembly, V-belt (if chain/belt drive), and quick-release clamp gasket. Doebritz offers 48-hour emergency spares dispatch to most industrial regions.

Is the valve suitable for dense phase pneumatic conveying?

Absolutely. The 0.1mm precision clearance and air-purge shaft seals maintain blowback resistance up to 1.5 bar differential. Specify the high-torque gearmotor option for dense phase pellet conveying.

How is the ATEX certification verified on delivered valves?

Each ATEX-certified Doebritz valve includes a physical stainless steel tag with CE and Ex markings, plus a 30-page technical file containing gap measurements, motor certification, and installation drawings required for plant safety audits.

Request Project-Specific Quotation

Doebritz engineers provide free sizing calculations, 3D CAD models (STEP/IGES), and pressure drop simulations for your pneumatic conveying line. Contact our heavy industries desk with your material properties, target throughput, and differential pressure requirements.