1.2 - MC9 - MC9 S.C.
The MC9 - MC9 S.C. balanced diaphragm first stage features a
lightweight structure of compact design, enclosed in an “aes-
thetic-protective” shell made from a special elastomer, specially
conceived to protect the regulator from impact.
It guarantees high breathing performance in every condition,
thanks to its balanced diaphragm mechanism, allowing the
maximum breathing comfort in every diving phase, starting from
the surface up to the maximum depth. The regulator, in fact,
supplies the same intermediate pressure independently from
the tank pressure, and keeps its performance independently
from the depth.
Unlike the most regulators on the market, offering their best
performance when the tank is loaded at its maximum working
pressure, MC9 first stage was designed to give its best perfor-
mance when the tank is about to empty. This ”hyper-balanc-
ing” feature is possible thanks to a system of regulation of the
intermediate pressure, which takes into account both the
air density as the depth increases and the progressive pressure
decrease due to the tank running down.
Thanks to this feature, MC9 first stage assists the diver during
the whole dive, guaranteeing the highest performance, which
improves during the most critical phase of surfacing.
Moreover, the balanced diaphragm mechanism, delivering air
“online”, allows remarkable amounts of air to pass, by a very small
pressure decrease between inhalation and exhalation phases.
These features are the results of several innovating technical
solutions taken by designing MC9 1st stage, making it one of the
best performing small and light regulators on the market.
In this first stage (fig. 3), the elastic diaphragm protects and seals
the system’ s inner mechanism, transmitting the changes of
water pressure to the high pressure valve.
The latter is made of special thermoplastic state-of-the art ela-
stomers, is highly resistant and easily replaceable. It boasts the
exclusive innovation of sliding inside a special self-lubricating
cylinder in a special thermoplastic material. The cylinder’ s inner
surface is completely free of oxidation, reduces any friction dra-
matically and makes the valve slide in an extremely easy and
precise way, guaranteeing the highest breathing comfort.
The HP seat is made of 316 stainless steel and is interchangea-
ble, in order to make the maintenance of the 1st stage easier.
The passage of air through the first stage is protected by a spe-
cial cup-shaped conical sintered filter, retaining any impurity from
tank and valves.
The regulation system of intermediate pressure in MC9 balanced
diaphragm first stage is the same as all other Cressi-sub first
stages, which allows an easy and quick adjustment of interme-
diate pressure without having to disassemble any component of
the regulator.
fig. 3
52
FIRST STAGES
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