Seac Sub SYNCHRO Anweisungen Seite 22

Fig. 6b
Fig. 8
Fig. 9
The membrane is made in transparent, elastic
silicon while the central disk is made from ac-
etate resin to eliminate any friction in order
to further facilitate inhalation.
The casing is produced from synthetic resin,
particularly resistant to impact, abrasion, ul-
traviolet rays, and external chemical agents.
The O-rings are in nitrile rubber subdivided
into different degrees of hardness (shore) ac-
cording to their applications. The internal
components are made from chrome-plated
brass and stainless steel.
The operation is of the "Downstream" type.
This system allows for low air consumption by
Fig. 7
An inner locknut blocks the membrane (Fig.
9) and fixes it solidly to the casing, increasing
safety and functionality. This component
eliminates the risk of losing the membrane in
the case the external cap should unexpected-
ly become loose.
The external cap (Fig. 10) is made of rubber
that is highly resistant to sunlight and saline
corrosion. Its special shape makes it easy to
find the centre, therefore facilitating the
manual regulation of the pressure.
Fig. 10
reducing air waste, as it perfectly meets the
breathing demand.
This means that the air flow delivery is per-
fectly controlled by the diver's breathing ac-
tion: a normal breathing action produces a
light air flow, while heavy breathing due to
fatigue or deep diving produces a free air
flow, also increased by the Venturi effect.
In addition, this system also provides safety
margins in case of first stage overpressure:
should the intermediate pressure supplied by
the first stage suddenly increase, the second
stage would continue to work, thus releasing
excess pressure and enabling the diver to
breathe.
The control of the DIVE and PRE-DIVE mecha-
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