(57) Pressure regulator for the regulator first stage of a two-stage aqualung, comprising
a reduction chamber (501; 901) which communicates, via a delivery valve (401), with
an admission channel (101) for admitting the high-pressure mixture of breathable gases,
and with at least one outlet (701) connected, via suitable connection means, to a
regulator second stage, there being a flexing chamber (801) for an elastically deformable
diaphragm (2) connected to a rod-shaped control member (431) of the delivery valve
(401), and there being an annular choke (621; 921) allowing axial sliding of the said
member (431) and obstructing the direct flow of gas between the said reduction chamber
(501; 901) and the said flexing chamber (801), characterized in that the regulator
is provided with a channel (811) which connects the said reduction chamber (501; 901)
with the said flexing chamber (801), flow adjustment means (821) being provided in
the said channel.
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