TURNKEY INDUSTRIAL INTEGRATION & SEALING SPECIFICATION: INTERCHANGEABLE SCREEN
EXECUTIVE SUMMARY
The Doebritz Interchangeable Screen represents a paradigm shift in inline screening technology for pneumatic conveying and gravity-fed bulk handling systems. Engineered for rapid changeover without disassembly of upstream or downstream ducting, this modular screen housing accepts a family of precision laser-cut screen inserts tailored to cut-points from 0.5 mm to 12 mm. Designed to mount directly between standardized flanges (DIN/ANSI), the Doebritz Interchangeable Screen minimizes production downtime, eliminates contamination risks, and provides verifiable protection against foreign material ingress into rotary valves, mills, and mixers.
HOUSING & SCREEN INTERFACE METALLURGY
The main housing is investment-cast 316L stainless steel (or optional abrasion-resistant AR400 steel) with a mirror-finished product contact surface. The interchangeable screen frame is laser-welded to a rigid support grid, preventing sagging under high differential pressure (up to 1.5 bar). A proprietary elastomer or PTFE perimeter gasket seals against the housing without metal-to-metal contact, preserving dimensional integrity across hundreds of changeovers. All fasteners are 304 SS, external, and tool-accessible.
KEY FEATURES
– Tool-less Screen Extraction: Single-lever cam clamps allow screen removal/replacement in under 60 seconds. No spool piece removal required.
– Positive Particle Arrestance: Achieves 99.5%+ retention efficiency at rated cut-point. Optional magnetic trap insert available for ferrous fines.
– Blowback Mitigation Geometry: Angled inlet deflector directs product flow across screen face, reducing direct impingement wear and extending screen life 3x vs. flat plate designs.
– Visual Verification Port: Tempered glass inspection window with integral LED stalklight (ATEX / non-ATEX variants) enables real-time blockage monitoring.
– Reversible Frame Design: Double-sided screen frame doubles service life; user flips insert when first side shows wear.
COMPLIANCE & SAFETY STANDARDS
– EU Regulation (EC) 1935/2004 – Food contact compliance for 316L variant.
– ATEX Directive 2014/34/EU – II 2D c T100°C (dust) and II 2G Ex h IIC T4 (gas) optional.
– NFPA 652 / 69 – Passive deflagration venting ready (vent panel optional).
– USDA / 3-A Sanitary Standard – Accepts CIP (clean-in-place) spray ball configuration.
– Pressure Equipment Directive (PED) 2014/68/EU – Category I, Module A.
TECHNICAL SPECIFICATIONS
Housing material: 316L stainless steel (std) / AR400 abrasion-resistant (opt).
Screen mesh: Woven wire (0.5–6 mm) or perforated plate (6–12 mm).
Max operating temperature: -20°C to +180°C (PTFE gasket) / -20°C to +120°C (elastomer).
Max differential pressure: 1.5 bar (continuous), 2.0 bar (peak).
Flange drilling: DIN EN 1092-1 (PN10/PN16) or ANSI B16.5 (150#). Sizes DN80 to DN400 (3″ to 16″).
Inlet / outlet offset: Zero (inline concentric) or optional eccentric 25 mm for sticky products.
Weight (DN150, 316L): 22 kg (housing only).
Surface finish: Ra ≤ 0.8 µm product contact, Ra ≤ 3.2 µm non-contact.
| Parameter | Specification |
|---|---|
| Nominal Sizes (DN) | 80, 100, 125, 150, 200, 250, 300, 400 (3″ to 16″) |
| Screen Cut-Point Range | 0.5 mm to 12 mm (mesh or perforated) |
| Max Flow Rate (air, 1 bar ΔP) | 1200 m³/h (DN150, clean screen) |
| Service Temperature Range | -20°C to +180°C (PTFE), -20°C to +120°C (elastomer) |
| Housing Metallurgy | 316L stainless steel (std) / AR400 (optional) |
| Gasket Material | White FDA silicone (std) / PTFE / FKM / EPDM |
| Inspection Port | Tempered glass, 50 mm diameter, LED stalklight ready |
| Changeover Time (typical) | < 60 seconds (tool-less) |
INDUSTRIAL DEPLOYMENT & CHANGEOVER LOGIC
Typical installation locations: Immediately upstream of rotary airlock, bin discharger, or mill infeed. Standard protocol for screen change without line break:
1. Isolate upstream flow (slide gate or rotary feeder stop).
2. Depressurize housing via ½” NPT ball valve (supplied).
3. Release cam clamps (3 positions on DN150, 4 on DN250+).
4. Extract screen frame laterally using integrated handles.
5. Replace or flip screen; re-insert frame; secure clamps.
6. Pressure test with inert gas (optional). Resume flow.
Optional automated pneumatic clamp system (modbus-enabled) available for fully remote changeover.
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