Cressi MC9 Manual De Istrucciones página 70

between lever and diaphragm, concentrating it onto a single spot
of the plate. The friction between lever and plate, as happens in
other regulators, is therefore
consequent reduction of the regulator' s performance. The
lever' s task is assisted by its special patented profile and by a
new patented system of swinging motion of the piston.
When touched, the lever opens the air supply valve, which has
been completely redesigned. The air flowing out of the valve
adjustable nozzle when the mechanism is open is led into the
injector leading it directly to the mouthpiece. Here, the air is
accelerated by the Venturi effect, causing a vacuum inside the
case. In order not to make it too sudden, that might "suck in" the
diaphragm and cause a free continuous intense air flow, the end
of the injector is shaped as to direct a small opposite air flow
towards the diaphragm.
A "valve-guiding" bush made of a special thermoplastic rubber,
placed inside the valve, performs the following two functions:
guides the spindle motion, reducing friction between the
mechanic elements each time the valve opens, and protects
the regulator in case the valve starts freezing at its most crucial
point. In this way, all the air required by the diver is only fed insi-
de the injector, thus avoiding any air loss in the connection of
spindle and valve-housing. Such loss would interfere with the
diaphragm bending, therefore causing the breathing effort to
increase.
When the air flow inside the injector towards the mouthpiece
increases, it is accelerated, as seen before, by the Venturi effect.
The consequent vacuum inside the regulator' s case flattens the
diaphragm, virtually reducing the diver' s breathing effort to zero.
The Venturi effect immediately stops as soon as the diver stops
breathing. The diaphragm returns to its normal position, the lever
comes up again pushed by its spring, and the nozzle is closed by
the piston.
avoided, along with the
To optimize the Venturi effect, Ellipse is supplied with a new
ergonomic flow deflector with two operating modes, clearly
shown by the scale on the regulator housing:
pre-dive "-" and dive "+" (picture 11). In first mode, a flow limiting
device pla-ced in the mouthpiece inlet starts operating and in-
hibits the Venturi effect, preventing free flow. In "+" mode, the
Venturi effect works at its best, increasing the air flow supplied to
the regulator to the maximum level.
WARNING: Always remember to set the flow deflector' s
lever in pre-dive (-) mode when not using the regulator;
otherwise, an accidental collision, the regulator falling into
water, pressing the manual regulation button without having
the mouthpiece in one' s mouth, or suddenly taking the regu-
lator out of the mouth might operate a strong free flow, cau-
sing high air consumption.
The dive (+) mode can only be used while diving and only
when the regulator is inside the mouth.
51
fig. 11