73
ENGLISH
Ellipse balanced second stage is an adjustable regulator, that is it
is possible to regulate the breathing effort. Operating an external
knob, it is possible to adjust the breathing effort varying the load of
the piston spring. Practically, turning the knob clockwise increases
the breathing effort, while turning it anticlockwise reduces it.
Two O-rings protect the mechanism from water seepage.
These, properly lubricated during manufacturing and mainte-
nance, protect the mechanism thread from possible oxidation
which might affect the knob turning, making it difficult or even
blocking it. On the contrary, the knob is easily turned and the ad-
justment of breathing effort can always be carried out in an easy
and precise way.
The adjustable nozzle is located inside the valve and, when the
mechanism opens, the air comes out and is led directly into the
mouthpiece, thanks to the special care dedicated by designing
shape and inner walls finish of the regulator’ s case.
In order not to make the vacuum inside the case too sudden (it
might “suck in” the diaphragm and cause free flow), the di-
aphragm inside the valve shows a balancing perforation.
When the air flowing inside the injector towards the mouthpiece
increases, it causes a vacuum inside the regulator’ s case due to
the air acceleration. This is called “Venturi effect” and flattens the
diaphragm, remarkably reducing the diver’ s breathing effort.
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.
In order to optimize the Venturi effect, Ellipse Balanced is supplied
with a flow deflector with two operating modes, clearly shown by
the scale on the regulator housing:
pre-dive “-“ and dive “+”. In first mode, a flow limiting device
placed in the mouthpiece inlet starts operating and inhibits 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 (+) position can only be used while diving and only
when the regulator is inside the mouth.
When the diver exhales, the pressure inside the regulator’ s case
increases, opening the angled conical large diameter exhaust
valve, allowing air to exit. The exhaust tee leads this air towards
the head’ s sides, protecting the valve from water turbulences
which might lift it, when the inside is depressurized, and flood it.
By the way, on Ellipse balanced second stage a further tee, can be
easily assembled, featuring prolonged exhaust pipes, specially
designed to remove bubbles from the field of vision.
fig. 7
PRE-DIVE
DIVE
SECOND STAGES
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