(57) The present invention relates to a pressure balancing valve for isothermal rooms,
comprising a hollow member designed to place the interior of an isothermal room directly
into communication with the outside, this member being provided transversely with
a set of flap valve elements which are freely hinged to said hollow member and divide
the interior thereof into a group of successive or "cascade" compartments; there being
also provided for said hollow member a containing cup which is designed to be mounted
orthogonally, either in an encased manner or projecting towards the outside, relative
to a vertical wall of the corresponding isothermal room which receives it.
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