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42
SECOND STAGES
the balancing chamber. Airtech Balanced Adjustable 2
also allows you to adjust the breathing effort. By turning the out-
side knob along the direction of the arrows, you can adjust the
level of resistance to inhalation by changing the poppet spring
load. By screwing the knob in (clockwise), the resistance to
inhalation is increased; by unscrewing it (counterclockwise), the
resistance to inhalation is lowered. Two O-rings are utilized in the
adjustment system for protection of the adjustment mechanism
against water leaks. These properly lubricated O-rings protect
the mechanism thread against oxidation, which could harden and
restrict the adjustment knob rotation. With proper regular mainte-
nance, the adjusting knob will always rotates smoothly, allowing
for accurate and smooth adjustment of the inhalation effort.
The adjustable orifice is located inside the housing. When the
mechanism is open, air enters the injector (19) and flows into the
mouthpiece. Air flows across the diaphragm-balancing hole,
which is aligned with the diaphragm. As a result of this design, the
second stage vacuum is controlled, not allowing the diaphragm
to be forced on the demand lever, resulting in a free flow.
When a significant amount of air flows through the injector into
the mouthpiece, a vacuum is formed inside the regulator case
nd
Stage
due to increased air speed. This high flow of air is called a Venturi
effect. Venturi effect keeps the diaphragm drawn down and sig-
nificantly reduces the inhalation effort.
When breathing stops, the Venturi effect is immediately discon-
nected; the diaphragm resumes its original position, the lever,
pushed by its spring force is raised, and the orifice is closed by
the poppet.
In order to maximize this Venturi effect, Airtech CE is fitted with a
flow control vane (7K) with two operating positions, clearly indi-
cated in the graduated scale on the regulator case as
Pre-dive "-" and Dive "+". When the vane is set to the pre-dive
position, a flow limiter inside the mouthpiece is actuated, which
limits the Venturi effect and prevents free-flowing. When in "+"
position, the Venturi effect is maximized, and the airflow to the
regulator is increased to the highest level.
WARNING: The small flow control lever vane must always
be kept in the pre-dive (-) position when the regulator is not in
use. In case of an accidental impact when the regulator is
being submerged, or in the event of the purge button being
depressed with the regulator out of the divers mouth, the reg-
ulator may start an excessive flow (free flow), depleting a sig-
nificant amount of air from the cylinders. The dive (+) position
must exclusively be used for diving at depth and only when the
mouthpiece is in the mouth.
fig. 16
DIVE
PRE-DIVE
fig. 17
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