Cressi MC9 Manual De Istrucciones página 66

2.1 – Adjustable Ellipse Balanced 2nd stage
Not adjustable Ellipse Balanced 2nd stage
Ellipse balanced second stages are revolutionary air balanced
regulators: they feature an elliptical shape, small weight (only 170
g - the lightest in its class!) and state-of-the-art design, besides
several innovating patented peculiarities. They come in two mod-
els: adjustable Ellipse Balanced and not adjustable Ellipse Black
Balanced.
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 has to be very slight in order not to make
breathing difficult. Such vacuum acts on the special variable-
section elliptical diaphragm, which has been designed to get a
larger working surface and to keep the breathing effort as low as
possible, guaranteeing even higher performance than larger
sized regulators'.
The diaphragm, sucked in towards the inside, causes the central
plate, manufactured in state-of-the-art thermoplastic anti-shock-
material, to touch the lever, which features a new revolutionary
shape, designed to optimize and reduce dramatically all frictions.
When touched, the lever opens the air supply valve.
fig. 5
Ellipse Balanced second stages are supplied with an air balanced
piston, showing a small diameter perforation all through its length.
Through it, the air flowing from the first stage reaches a small-
chamber (called balancing chamber) at the end of the piston.
The air inside this chamber pushes the piston towards the valve
nozzle, with a force depending on the depth. In such way, the
forces operating over the valve opening and closing are balan-
ced, allowing the use of a less loaded spring, so that the valve
opens more delicately.
The force of the air flowing through the nozzle and opening the
pad, which is perforated and placed at the end of the spindle, is
contrasted by the combined forces of the spring and the air in
the balancing chamber.
All this means a reduced, almost inexistent breathing effort, with
high performance even at high depth.
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
47
fig. 6