WARNING: the second stage can be opened, disassem-
bled and set only and exclusively at authorized Cressi-sub
centres; the setting values CANNOT and MUST NOT be varied
by the user, so as not to affect the device performances. We
decline any responsibility for any operation carried out by
unauthorized personnel.
NOTE: we recommend to have the regulator completely serv-
iced yearly or even oftener in case of intensive use; only original
Cressi-sub spare parts are to be used.
Visit our site www.cressi.com: you will find more information about
our equipment.
2.5 – XS2
Second stage supplies air “on demand”, that is only when the
diver inhales from the mouthpiece, causing a slight vacuum insi-
de the regulator, which must be very slight in order not to make
breathing difficult. Such vacuum acts on the diaphragm, which is
sucked in towards the inside, causing the central plate to touch
the lever. The latter opens the air supply valve.
The valve of XS2 is composed of a renovated modular poppet
in plastic and chromium-plated brass, which is interchangeable
with previous models of XS range: on one side, it is connected to
the lever, on the other side, it houses a newly designed thicker
rubber pad, closing the new adjustable nozzle, through which
the air flows at a pressure by 10 bar (145 psi) higher than the
environmental.
The air contained in the nozzle pushes the pad, which is contra-
sted by the poppet’ s spring.
Therefore, the renovated poppet “floats” between the push of in-
flowing air and the spring which, having a slightly higher
strength, clos es the nozzle perfectly.
The adjustable nozzle is placed inside the valve seat. The outflow
air, when the mechanism is open, is directed through the injec-
tor and directly into the mouthpiece.
70
SECOND STAGES
fig. 21
fig. 22
fig. 23 - Octopus XS
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