2.1. - Master / Master Cromo / Galaxy /
Octopus MG Balanced
Cressi sub's line of balanced second stages is represented by
revolutionary pneumatic balanced regulators. They are elliptical in
shape and are more lightweight (in fact, the adjustable Master
version weighs just 207 gr - the lightest in its category!). Their fu-
turistic designs boast many innovative patented features and are
available in three different versions: Galaxy Adjustable (Fig. 7),
Master (Fig. 8) (adjustable) and Galaxy (Fig. 9) (non-adjustable).
Both versions provide air on-demand, i.e. only when the diver in-
hales through the mouthpiece, generating slight negative pressure
inside the regulator - it needs to be as light as possible so as not to
cause undue respiratory exertion. The special adjustable elliptical
diaphragm reacts to the negative pressure; it is designed to in-
crease its usable surface accordingly, in order to keep the breath-
ing effort to the absolute minimum. This regulator’s level of
performance is guaranteed to be similar - if not superior - to any
other regulator of a bigger in size.
The diaphragm gets sucked back inside the casing and brings the
central disc - made of state-of-the-art friction-proof thermoplastic
- into contact with the new lever designed with revolutionary geo-
metrics in order to enhance performance and drastically reduce
friction.
The lever is subsequently lowered and in doing so, opens the valve.
Cressi-Sub’s range of second-stage balanced regulators are
equipped with a pneumatically balanced piston with a hole of min-
imal diameter going through it lengthwise.
The air from the first-stage comes through this hole and enters a
small chamber (called the “balance chamber”) positioned at the
edge of the piston.
The air contained in this chamber exercises a level of pressure
which varies according to the depth of the water and pushes the
closing piston towards the valve nozzle. This way, a certain balance
62
SECOND STAGES
fig. 11
fig. 8
fig. 7
fig. 9
fig. 10
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