Explosion Barrier and Isolation

Rotolok offer an extensive range of Rotary Valves certified as suitable for use as an explosion barrier to a maximum of 10bar and for explosion isolation for St1 and St2 dusts. Twelve different sizes between 125 and 600mm with Square flange connections, all in Cast Iron or Stainless Steel. Baseefa certificate 11ATEX0127X accredits the range as Ex II D.

Due to careful design of the internal components the overall dimensions are very similar to our standard range of valves and we can offer a selection of optional features such as purged shaft seals, scalloped rotor pockets and staggered rotor pockets without the throughput being greatly reduced or the barrier efficiency being affected. The minor design modifications also mean we can maintain the high specification and quality required as well as our competitive price structure.

During the barrier test process it was proven that standard valves do not provide adequate protection against potential explosion pressures, so make sure the valves you purchase for barrier applications are properly rated and certified.

The picture shows what 10 bar explosion pressure can do to 10mm thick carbon steel rotor vanes of inadequate design.

DSEAR Hazardous Area Zones

The range of Rotary Valves certified as suitable for use in Hazardous Zones covers thirteen sizes between 85 and 750mm with Round connection flanges and twelve sizes between 125 and 915mm with Square connection flanges, all in Cast Iron or Stainless Steel. Baseefa certificate 09ATEX0266X accredits the range as Ex II 1 GD c T4 135°C.

This rates our standard range of valves as Group II Category 1 Equipment suitable for use in Potentially Explosive Atmospheres covered by European Directive 94/9/EC and can be used in hazardous Dust or Gas environments with internals designated up to Zone 0 or 20 and externals to Zone 1 or 21 in accordance with DSEAR.

In some applications it may be possible to supply equipment certified to cover both requirements, please contact our Sales Office.