Rank: New forum user 
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I am after some professional advice regarding the use of CARZ valve on an extraction system. TThere is a CARZ valve inline on the dirty air extraction route but should there be a valve fitted on the return air side? This would be after the filter box, and I understand that the air would be clean at this point, but what about if the filters become damaged or where to leak into the clean side? Edited by user 23 January 2025 08:35:42(UTC)
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Rank: Super forum user 
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A CARZ valve is designed to prevent an explosion pressure wave (and any fire) returning along the inlet ducting to the extraction points within the process. An LEV system for explosive dusts would have an explosion hatch or plate on the dirty side of the filter. In the event of explosion the pressue wave would vent to atmosphere. Filter damage indicates poor maintenance practices, incorrect filter media selection (buying to price rather than purpose) or change in use (materials being processed).
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Rank: Super forum user
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A CARZ valve is designed to prevent an explosion pressure wave (and any fire) returning along the inlet ducting to the extraction points within the process. An LEV system for explosive dusts would have an explosion hatch or plate on the dirty side of the filter. In the event of explosion the pressue wave would vent to atmosphere. Filter damage indicates poor maintenance practices, incorrect filter media selection (buying to price rather than purpose) or change in use (materials being processed).
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Rank: New forum user
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Originally Posted by: Roundtuit  A CARZ valve is designed to prevent an explosion pressure wave (and any fire) returning along the inlet ducting to the extraction points within the process. An LEV system for explosive dusts would have an explosion hatch or plate on the dirty side of the filter. In the event of explosion the pressue wave would vent to atmosphere. Filter damage indicates poor maintenance practices, incorrect filter media selection (buying to price rather than purpose) or change in use (materials being processed).
So no requirement on the return side with clean air? Worst case scenario is with issues on filters and allowing particles back in.
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