Gyratroy Sifter GSF Series, Doebritz Industrial Screener, High-Capacity / ATEX Certified

Product Summary

Doebritz presents the Gyratroy Sifter GSF Series – a high-performance, gyratory screening solution engineered for continuous, dust-free separation of bulk powders, granules, and flakes. Achieving screening capacities up to 50 tons/hour (depending on mesh size and material density), the GSF Series features ATEX certified explosion-proof design for hazardous environments (Zone 22). With minimal dynamic loads and a fully enclosed housing, this sifter ensures precise particle classification while eliminating airborne dust leakage. Ideal for feeding pneumatic conveying systems or direct silo discharge.

Why Source Doebritz Gyratroy Sifter

• Global OEM Engineering Heritage: 15+ years supplying heavy industry leaders with precision CNC-machined screening components, ensuring <0.5% misalignment tolerance.
• Minimal Air Leakage & Dust Control: Patented dual-sealing system reduces air ingress to <0.2 m³/h, critical for vacuum or pressure-differential processes.
• ATEX Certified Explosion-Proof: Full compliance with 2014/34/EU, including conductive gaskets and grounding rotors. Certificates available upon request.
• Ultra-Long Service Life: Heavy-duty housing (cast iron or SS316L) with replaceable wear liners reduces downtime by 40% compared to standard vibratory screens.
• Fast Lead Times & Non-Standard Customization: Standard sizes (24”, 36”, 48”, 60”) in stock. OEM custom flanges, inspection doors, and mesh sizes delivered in 15-25 working days.

Housing & Rotor Engineering

The Doebritz Gyratroy Sifter features a robust, one-piece cast housing (EN-GJL-250 cast iron or AISI 316L stainless steel) with stress-relieved geometry to withstand continuous gyratory motion. Unlike circular vibratory separators, our unique gyratory drive mechanism creates a multi-plane, low-impact motion that accelerates material across the screen surface while minimizing particle attrition. The internal ball tray and bouncing ball cleaning system prevents screen blinding, ensuring consistent open area. Rotor assemblies (where applicable for forced discharge) are precision-balanced via CNC machining to ISO 1940 G6.3 standard, extending bearing life beyond 50,000 hours. Every unit includes outboard bearings with labyrinth seals for contamination resistance.

Technical Specifications

All Doebritz Gyratroy Sifters are tested per ISO 9001:2015 and CE marked. Below parameters apply to standard GSF Series. Non-standard configurations (e.g., FDA-compliant finish, quick-release clamps) available for OEM buyers.

Specification	GSF-24	GSF-36	GSF-48	GSF-60
Screen Diameter	24 in (610 mm)	36 in (914 mm)	48 in (1219 mm)	60 in (1524 mm)
Body Material	Cast Iron / SS316L	Cast Iron / SS316L	Cast Iron / SS316L	Cast Iron / SS316L
Motor Power	1.1 kW / 1.5 HP	2.2 kW / 3 HP	3.7 kW / 5 HP	5.5 kW / 7.5 HP
Max Capacity (powder)	Up to 10 t/h	Up to 20 t/h	Up to 35 t/h	Up to 50 t/h
Max Temp (std/HT)	80°C / 200°C	80°C / 200°C	80°C / 200°C	80°C / 200°C
ATEX Rating	II 2D Ex h IIIC	II 2D Ex h IIIC	II 2D Ex h IIIC	II 2D Ex h IIIC

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems (Dilute & Dense Phase)

Integrated directly into positive or negative pressure conveying lines, the GSF Series removes oversized contaminants and agglomerates upstream of storage silos or packaging machines. The low air leakage design maintains system pressure drop below 8 kPa.

Silo Discharging & Scalping

Mounted beneath storage silos or hoppers, the Gyratroy Sifter provides reliable scalping of foreign materials (bags strings, wood chips, metal fragments) from free-flowing powders like cement, lime, flour, or plastic pellets. Optional quick-release clamps allow screen change in under 2 minutes.

Dust Filter Collectors & Product Recovery

When installed downstream of dust collection systems, the Doebritz sifter recovers valuable fines from air returns, reducing waste and improving yield. Explosion-proof configuration complies with NFPA 654 standards for combustible dust.

Frequently Asked Questions

What is the maximum temperature rating for the Doebritz Gyratroy Sifter?

Standard version operates from -20°C to +80°C. With high-temperature seals and grease, the GSF-HT option handles up to +200°C. For cryogenic applications (down to -40°C), please consult our engineering team.

Can you provide non-standard inlet/outlet flanges?

Yes. Doebritz offers custom drilling patterns, dimensional flanges (DIN, ANSI 150#, JIS, or sanitary tri-clamp), and offset discharge spouts. Minimum order quantity for custom flanges is 4 units or a surcharge applies for single prototypes.

Is ATEX certification included, and how can I obtain the certificate?

All GSF Series sifters are ATEX II 2D Ex h IIIC T120°C X certified as standard. We provide the full EC Type Examination Certificate (pdf) with each shipment. Additional IECEx certification available upon request with a 7-day lead time.

What is your typical lead time for a 48” Gyratroy Sifter?

Standard models (cast iron housing, standard mesh, no customization) ship in 10-14 working days from our EU or US warehouse. Non-standard materials (SS316L) or custom meshes require 20-25 working days. Rush assembly (+15%) can reduce to 7 days.

How does the gyratory motion differ from conventional vibratory screens?

Conventional vibratory separators use high-frequency, low-amplitude vibration causing particle attrition and blinding. The Doebritz gyratory motion generates a horizontal, low-speed (200-300 RPM), multi-plane action that stratifies material gently, allowing highly accurate cut points (down to 45 microns) without damaging friable products. This also reduces structural stress on supporting steelwork.