PRODUCT OVERVIEW: DOEBRITZ TUNGSTEN CARBIDE COATED STAR DISCHARGE VALVE
The Doebritz DBR-1237 gravity-type quick-release rotary valve (Star discharge valve / Airlock feeder) with stainless steel base material and full tungsten carbide coating is engineered for extreme abrasive, corrosive, and high-purity bulk solids handling. Designed for positive/negative pressure pneumatic conveying, gravity discharge, and automated metering lines, this valve combines precision rotor-to-housing clearance (0.1–0.2 mm), ATEX-certified flameproof isolation (16 bar pressure rating), and rapid maintenance via tool-free quick-release.
HOUSING & ROTOR METALLURGY
Base material: SUS304 or SUS316L stainless steel. Contact surfaces: Tungsten carbide (WC) coating applied via HVOF or equivalent process. Coating extends rotor vanes, housing inner bore, and end plates. Alternative coatings: Ceramic (Al2O3/TiO2), PTFE, PE, PA, or polymer liners. Surface finish: Internal mirror or machined ≤ Ra 0.4–1.6 μm; external anti-fingerprint, sandblasted or shot-blasted, machined finish <0.8 μm.
KEY FEATURES
- Quick-release disassembly: No special tools, supports manual cleaning, online CIP, or WIP + manual inspection. Reduces downtime dramatically.
- Precision airlock sealing: Rotor-to-housing clearance 0.1–0.2 mm; reduced air leakage for stable pneumatic conveying and accurate batch/recipe metering.
- Tungsten carbide wear defense: Extends service life in high-abrasion materials (carbon black, lithium battery powders, silicon, petroleum coke, pigments).
- Pressure range compatibility: Positive low-pressure <0.4 bar; positive high-pressure 0.4–1 bar (VFD). Negative low-pressure >-0.4 bar; negative high-pressure -1 to -0.4 bar (VFD). Gravity: adjustable flow, no leakage.
– ATEX & NFPA compliance: Zone 20/21/22, flameproof housing rated 16 bar, explosion-proof motor, precision spark gap control.
– Hygienic design: Suitable for Class W, 10W, 30W, C, D cleanrooms, GMP compliance.
– Automation-ready: VFD speed control, PLC integration, batch/recipe metering, automated batching.
– Optional water cooling jacket for hot materials up to 120°C.
COMPLIANCE & SAFETY STANDARDS
CE certified, TÜV certified, Statement certification. Conforms to ATEX Directive 2014/34/EU for Zone 20, 21, 22 dust explosion atmospheres. NFPA 69 compliant for flame propagation isolation. Pressure equipment directive (PED) 2014/68/EU for 16 bar rating. Flange standard HG20592 (alternative DIN/ANSI available). All Doebritz valves meet ISO 9001 manufacturing quality.
TECHNICAL SPECIFICATIONS
– Materials: Base SUS304 / SUS316L / Carbon steel; coating tungsten carbide, ceramic, PTFE, PE, PA, polymer
– Clearance (rotor to housing): 0.1–0.2 mm
– Shaft seal: Lip seal air-tight (gas purging option)
– Flange size: DN50, DN100, DN150, DN200, DN300, DN350 (HG20592 standard)
– Ambient temp: -15°C to +60°C
– Material temp: 0°C to +120°C (water cooling jacket optional)
– Pressure positive: <0.4 bar low; 0.4–1 bar high (VFD)
- Pressure negative: >-0.4 bar low; -1 to -0.4 bar high (VFD)
– ATEX zones: 20, 21, 22
– Flameproof rating: 16 bar
– Cleanability: Quick-release manual, CIP, WIP
– Drives: VFD, explosion-proof motor, chain or direct drive
– Control: PLC, batch/recipe metering, automated batching
| Parameter | Specification (Doebritz DBR-1237 Tungsten Carbide Coated) |
|---|---|
| Capacity / Volumetric range | Application-specific; typical 2.5–100 Liters/rev (DN50–DN350) |
| Flange Standard | HG20592 (custom DIN/ANSI available) |
| Drive Configuration | VFD direct drive or chain drive with explosion-proof motor option |
| Max Pressure Differential | 1 bar positive, -1 bar negative |
| ATEX Certification | Zone 20, 21, 22; Flameproof 16 bar |
INDUSTRIAL DEPLOYMENT
Typical materials handled (from Doebritz documented applications):
– Food: Coffee, chocolate, flour, milk powder, protein powder, whey powder, spices, salt, bakery premixes.
– Pharmaceutical: Antibiotic powder, vitamin powder, lyophilized vaccine powder, probiotic powder, microcrystalline cellulose, lactose.
– Chemical, New Energy, Materials: Carbon black, PE/PP pellets, PTA, lithium battery ternary cathode and graphite anode materials, silicon powder, petroleum coke, titanium dioxide, pigments, fertilizer, fine chemicals.
Doebritz provides full engineering support: application assessment, custom sizing, material selection, flange adapters, and after-sales service. The DBR-1237 series is a proven, reliable asset for modern food, pharma, chemical, and new-energy production lines.
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