ATEX Zone 20/21 Compliant Valve: Doebritz High-Precision Metering Valve | Certified Explosion Safety

Precision Metering Valve Overview

Doebritz high-precision metering valve represents the pinnacle of German-engineered powder handling technology. Designed specifically for industries requiring exact dosing, reliable airlock sealing, and uncompromised safety, this metering valve delivers exceptional performance across food, pharmaceutical, chemical, and new energy sectors. With its heavy-duty construction and advanced sealing mechanisms, the Doebritz metering valve ensures stable feeding under both positive and negative pressure pneumatic conveying systems . The high-precision metering valve incorporates precision-machined rotor pockets that guarantee accurate, quantitative material discharge while preventing bridging and maintaining uniform feed rates under varying system loads .

Why Source Doebritz High-Precision Metering Valve

• Industry-Leading Low Air Leakage: The high-precision metering valve features an ultra-tight rotor-to-housing clearance of just 0.15mm – 0.2mm, setting the highest standard in the powder handling industry. This precision eliminates powder and air leakage at silo outlets, guaranteeing zero static leakage and preventing blowback air from reaching dumping stations during positive pressure conveying .
• ATEX Zone 20/21 Explosion-Proof Certification: TÜV-certified with official Statement of Explosion Protection, the Doebritz high-precision metering valve complies with EN 1127-1:2019, EN ISO 80079-36:2016, and EN ISO 80079-37:2016 standards. The reinforced valve housing withstands internal explosion pressures of >10 bar, ensuring maximum safety in hazardous dust and gas environments .
• 10-Minute Quick Disassembly & Cleaning: Engineered for operational efficiency, the metering valve can be dismantled, cleaned, and reassembled by a single operator using just one standard adjustable wrench. This quick-release design minimizes downtime and supports both CIP (Clean-in-Place) and WIP (Wash-in-Place) systems with zero water leakage during operation .
• CNC Precision Machining & German Engineering: Backed by Doebritz’s German technical expertise and state-of-the-art CNC machining, every high-precision metering valve component meets strict dimensional tolerances. This ensures optimal dynamic air tightness, even under extreme inlet/outlet pressure differentials .

Housing & Rotor Engineering

The Doebritz high-precision metering valve features a robust housing manufactured from premium SUS304 or SUS316L stainless steel, with optional carbon steel and wear-resistant coating materials available . Internal surfaces are electrolytically polished to Ra≤0.8μm, complying with FDA/GMP standards for sanitary processing . The metering valve’s rotor design incorporates either adjustable blades or fixed vanes, with options including steel, hardened steel, stainless steel, or polyurethane construction to suit specific material handling requirements . The innovative double sealing system prevents pressure loss and gas leakage, ensuring a highly stable environment for pneumatic conveying . Standard sizes range from DN50 to DN350, with HG20592, DIN, and ANSI flange options available to accommodate diverse installation requirements.

Technical Specifications

Specification	Detail
Body Material	SUS304 / SUS316L Stainless Steel, Carbon Steel
Rotor Design	Adjustable Blades / Fixed Vanes (Steel, Hardened Steel, Stainless Steel, Polyurethane)
Working Pressure	-0.5 to 2 bar
Working Temperature	-10 to 150°C (Higher options available)
Processing Capacity	110–634 L/min (up to 10 m³/h)
Rotor-to-Housing Clearance	0.15–0.2mm
Surface Finish (Internal)	Ra≤0.8μm (mirror polish available)
ATEX Certification	Zone 20/21/22, TÜV Certified
Explosion Pressure Resistance	>10 bar
Flange Standards	HG20592, DIN, ANSI (customizable)
Sealing System	Double sealing / Lip seal air-tight seal
Cleanability	Quick-release disassembly, CIP/WIP ready
Power Supply	Customized based on load requirements

Heavy-Duty Application Scenarios

Explosion-Proof Powder Handling

For industries operating in ATEX Zone 20, 21, or 22 hazardous environments, the Doebritz high-precision metering valve with TÜV certification provides essential safety and operational reliability. The flameproof construction and internal explosion pressure resistance of >10 bar make it ideal for handling combustible dusts such as carbon black, lithium battery materials, and fine chemical powders .

Sanitary Processing & CIP Operations

The high-precision metering valve’s quick-release design and polished stainless steel surfaces (Ra≤0.8μm) make it the preferred choice for food and pharmaceutical applications requiring stringent hygiene standards. The ability to dismantle and clean in just 10 minutes reduces batch changeover time by up to 70%, significantly improving production efficiency .

Pneumatic Conveying Systems

Doebritz high-precision metering valve excels in both positive and negative pressure pneumatic conveying applications. With working pressure capabilities from -0.5 bar to 2 bar and processing capacities up to 634 L/min, it maintains stable material flow while preventing blowback and ensuring accurate metering . Gravity feeding and discharging configurations are also available, utilizing gravity to ensure smooth material flow while reducing energy consumption .

Global OEM Assurance

As a joint venture combining Doebritz German engineering with extensive powder handling industry experience, Doebritz (Shanghai) Co., Ltd. delivers premium OEM-quality high-precision metering valves to customers worldwide. Each metering valve undergoes 100% pre-shipment clearance verification to ensure absolute reliability. With a dedicated team of 40–45 professionals and established export channels to Eastern Europe, Southeast Asia, South America, and the Middle East, Doebritz provides comprehensive technical support, application engineering, and after-sales service .

Frequently Asked Questions

What is the working pressure range of the Doebritz high-precision metering valve?

The Doebritz high-precision metering valve safely operates within a pressure range of -0.5 bar to 2 bar, making it suitable for both vacuum and positive pressure pneumatic conveying systems .

Is the Doebritz high-precision metering valve ATEX certified for hazardous areas?

Yes, the Doebritz high-precision metering valve carries TÜV-certified ATEX certification for Zone 20, 21, and 22 hazardous dust and gas environments, with compliance to EN 1127-1:2019, EN ISO 80079-36:2016, and EN ISO 80079-37:2016 standards .

How long does it take to clean the Doebritz high-precision metering valve?

The quick-release design allows a single operator to dismantle, clean, and reassemble the valve in just 10 minutes using a single standard wrench, significantly minimizing production downtime .

What materials are available for the Doebritz high-precision metering valve?

The valve is available in SUS304, SUS316L stainless steel, carbon steel, and various wear-resistant coatings including tungsten carbide and ceramic. Rotor options include steel, hardened steel, stainless steel, and polyurethane .

Does the Doebritz high-precision metering valve support CIP cleaning?

Yes, the valve is fully compatible with CIP and WIP systems, featuring zero water leakage during operation and internal geometry designed for thorough automated cleaning with minimal manual intervention .