Doebritz Food Grade Quick-Release Rotary Airlock, Stainless Steel 316L / <20 ppm Leakage, ATEX Certified

Product Summary

The Doebritz Food Grade Quick-Release Rotary Airlock sets the benchmark for hygienic powder and bulk solids handling. Engineered for capacities up to 45 m³/h and delta-P resistance of 1.5 bar (21.7 psi), this ATEX-certified rotary valve delivers minimal air leakage (<20 ppm @ 0.8 bar differential). The quick-release end covers enable rapid sanitation without removing the drive train — ideal for food, dairy, and nutraceutical applications with sticky or abrasive powders.

Why Source Doebritz Food Grade Rotary Valves

• Ultra-Low Air Leakage: Precision-machined rotor-to-housing clearances down to 0.10 mm guarantee <20 ppm leakage, maximizing pneumatic conveying efficiency.
• True Quick-Release Design: Patented cam-over clamps allow full access to the rotor and seals in under 2 minutes — no special tools required.
• Hygienic Engineering: All product contact surfaces are Stainless Steel 316L with Ra ≤ 0.8 µm mirror polish, eliminating bacterial traps.
• Explosion-Proof Ready: ATEX II 2D/2G EX c/h/t X certified (optional) for explosive dust/gas environments, with static-conductive seals and grounding studs.
• Global OEM Supply Chain: Full CNC machining center with on-site CMM inspection, PPAP Level 3 documentation, and 48-hour sample expedite for qualified partners.

<img src="https://www.doebritzgroup.com/wp-content/uploads/2026/04/image_e8605612-scaled.jpg" alt="Doebritz Food Grade Quick-Release Rotary Airlock, Stainless Steel 316L /

Housing & Rotor Engineering

The Doebritz food grade rotary airlock features a one-piece cast housing with polished internal radiuses to eliminate dead zones. The quick-release end covers are CNC-machined from solid 316L billet, fitted with EPDM or FKM O-rings (FDA compliant). Bearings are mounted outboard and isolated from the product zone via four labyrinth seals and an air-purge port, ensuring zero lubricant contamination. Rotor options include 8, 10, or 12 vanes with closed-end, open-end, or chamfered tip designs — the chamfered version actively shears bridging material, preventing jams with sticky dough or protein powders.

Technical Specifications

All data verified under ISO 9001:2015 and EHEDG guidelines. Custom flange drilling (ANSI, DIN, JIS) available with short lead times.

Specification	Detail
Body / Rotor Material	Stainless Steel 316L (1.4404), cast or billet
Rotor Design	8-vane, 10-vane, or 12-vane; closed, open, or chamfered tip
Inlet/Outlet Size	DN150, DN200, DN250, DN300 (custom tri-clamp optional)
Max Differential Pressure	1.5 bar (21.7 psi)
Leakage (0.8 bar diff)	<20 ppm (N₂ test per DIN EN 12480)
Temperature Range	-20°C to +150°C (standard); up to +220°C (high-temp option)
Surface Finish (Product Contact)	Ra ≤ 0.8 µm mirror polish (electropolish optional)
Certifications	ATEX II 2D/2G, FDA 21 CFR, EHEDG, 3.1 EN10204
Quick-Release Mechanism	Cam-over clamps with safety latch, tool-free cover removal
Net Weight (DN200)	38 kg (84 lbs) – 316L version

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

In dilute or dense-phase pneumatic lines, the Doebritz airlock maintains stable pressure drops while feeding milk powder, flour, or sweeteners. The quick-release feature minimizes downtime during product changeovers.

Silo Discharging with Sanitary Requirements

When mounted below grain, sugar, or starch silos, the rotary valve prevents flooding while providing gentle, metered discharge. The food-grade polish and quick-release covers allow daily CIP cleaning.

Dust Filter Collectors (Food Plants)

As a proven airlock for dust collection hoppers, the Doebritz valve recovers premium food dust (spices, cocoa, instant coffee) without cross-contamination. ATEX version ensures safety in flour mills.

<img src="https://www.doebritzgroup.com/wp-content/uploads/2026/04/image_586b7b66-scaled.jpg" alt="Doebritz Food Grade Quick-Release Rotary Airlock, Stainless Steel 316L /

Frequently Asked Questions

What is the typical lead time for a Doebritz Food Grade Quick-Release Rotary Airlock?

Standard sizes (DN150 to DN300) with cast housing ship in 4-6 weeks. For fully CNC-machined 316L housings or custom inlet/outlet configurations, lead time is 8-10 weeks. OEM stocking agreements can reduce this to 2 weeks for blanket orders.

Can you provide non-standard flanges (e.g., DIN 2633 or sanitary clamp ends)?

Yes. Doebritz offers any flange drilling pattern or tri-clamp connections with no engineering surcharge for minimum order quantities ≥5 units. Submit your flange drawing for a rapid CNC cost estimate.

Is the quick-release mechanism compatible with high-temperature processes?

Absolutely. The standard design handles up to 150°C (302°F) with basic FKM seals. For continuous operation at 220°C (428°F), we offer a high-temp variant with Graphite-impregnated PTFE seals and a ceramic bearing spacer. Note that at >150°C, the quick-release clamps remain cool to touch due to thermal break fins integrated into the end covers.

Do you supply third-party ATEX or FDA documentation for global compliance?

Yes, every Doebritz food grade rotary airlock ships with a complete compliance dossier including: EC Type Examination Certificate (ATEX category 2D/2G), FDA 21 CFR 177.2600 seal certificates, EHEDG type certificate, 3.1 material certificate per EN 10204, and NACE MR0175 upon request.

How do you achieve <20 ppm leakage on a quick-release design?

The secret is a two-stage sealing system: (1) precision line-bored housing and rotor with 0.10-0.12 mm clearance; (2) pressurized air-purge to the shaft labyrinth seals, which creates a 50 mbar counter-current. Our production CMM checks every rotor profile to ensure deviation <0.01 mm. Leakage is validated on a test bench per DIN EN 12480.