Non-Return / Pressure Relief Dampers

A non-return, or press relief, damper is a gravity-operated damper which allows air to one flow in one direction only. It is fitted with sliding counter-weights which can be adjusted to suit the ‘relief’ pressure required by the process. This type of damper is commonly used as a ‘vacuum break’ damper, which opens against its counter-weight to relieve excessive negative pressure and protect ductwork from implosion.
Flowrite also manufactures a combined actuated/pressure relief damper, which operates as described above, but which can be over-ridden and powered open if required.

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