IsoFlap Passive Isolation Valve
The IEP Technologies IsoFlap® is a passive explosion isolation flap valve designed to prevent explosion propagation between interconnected process equipment. It operates without external power or triggering systems, using process airflow during normal operation and automatically closing under explosion pressure conditions to isolate upstream equipment.
Description
The valve is intended for use in dust handling systems such as dust collectors, cyclones, and other industrial process vessels handling combustible dust. During normal operation, the flap remains open due to airflow. In the event of an explosion, the pressure front forces the flap to close and lock, forming a mechanical barrier that limits flame and pressure transmission.
The IsoFlap®-M variant includes integrated monitoring for dust accumulation and flap position, supporting compliance with OSHA, NFPA 654, and NFPA 69 requirements.
Technical specification
| Parameter | Value |
|---|---|
| Product Type | Passive explosion isolation flap valve |
| Application | Explosion isolation in dust handling systems |
| Operating Principle | Self-actuating mechanical flap closure |
| Monitoring | (IsoFlap-M) Dust accumulation + flap position monitoring |
| Certifications | EN 16447 / ATEX Directive 2014/34/EU |
| Valve Body Material | Carbon steel or optional stainless steel |
| Housing Design | Cylindrical corrosion-resistant design |
| Installation | Orientation PUSH / PULL configurations |
| Maintenance Access | Hinged inspection cover (DN630 and above) |
| Flow Characteristics | Low pressure drop design |
| Application Compatibility | Metal dust applications (ST1 range) |
| Corrosion Resistance | Salt spray tested |
Functional Features
- Passive self-actuating explosion isolation (no sensors required)
- Flap locks during explosion pressure event
- Leak-tight bearing shaft internal design
- Short installation mounting distances
- Cylindrical housing reduces material build-up
- Suitable for up to two elbows between valve and protected vessel
- Corrosion-resistant construction
IsoFlap-M Interface Module (Optional)
- PCB-based monitoring system
- Intrinsically safe sensor barriers
- Process interlock functions
- Diagnostic and maintenance features
- Operates on 120 / 230 VAC
Typical Applications
- Dust collectors
- Cyclones
- Pneumatic conveying systems
- Industrial dust handling systems
- Explosion vented or flameless vented systems
Features
- Passive explosion isolation without external triggering systems
- Fast self-actuating flap closure under explosion pressure
- Certified according to EN 16447
- Optional monitored version compliant with NFPA 69
- Low pressure drop design for efficient airflow
- Cylindrical housing reduces internal dust accumulation
- Corrosion-resistant construction validated by testing
- Suitable for PUSH and PULL system configurations
- Easy inspection access via hinged cover (large sizes)
- Designed for dust explosion protection in industrial processes
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