(57) What shall be described is a demand-valve (1) for delivering air into a compressed-air
breathing apparatus that comprises a substantially cylindrical chamber (3), a first
entry-gate (14) for admitting air into the chamber, that presents a passage-opening
- controlled by intercepting-means which comprise a blocking-element (20) that is
mechanically connected to a deformable membrane (7), and a second entrygate (15) predisposed
for feeding-in said air. The device is characterized by the fact that, the axis (a1) of said first entry-gate forms a first angle (a) with the bottom-surface (8) of
said chamber, and that the axis (a2) of said second exit-gate forms a second angle (β) with the lateral-surface (4) of
the chamber; said two axes lying substantially on the same diametrical plane of said
chamber.
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