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INSTRUCTIONS
Cressi-sub Self-Contained Underwater Breathing Apparatus
(SCUBA) is certified for use down to a depth of 50 m in compli-
ance with UNI EN 250 Standards.
The tank/valve assembly meets the basic safety requirements
set forth in PED 97/23/CE Directive.
MAIN COMPONENTS
Scuba equipment consists of one or more cylinders, valves and
protective cylinder boots.
The regulator is connected to the valve in order to reduce cylin-
der air pressure (high pressure) to ambient which pressure a
diver can breathe.
The regulator must feature a pressure control system consisting
of a pressure gauge or a pressure measuring computer.
The scuba can be fastened to the diver’s body both by a back-
pack complete with straps and by a buoyancy compensator
(jacket) designed to offer the diver a perfect fit with the equipment.
CYLINDERS
Cylinders are made of chrome-molybdenum alloy steel. They
are designed to be used with a working pressure of 200 or max.
232 bars, and are hydraulically tested at a pressure of 318 bars
(the 200-bar cylinders) and 372 bars (the 232-bar cylinders).
The cylinder top opening features an internal M 25 x 2 ISO thread
(in compliance with DIN 477) for connection with the valves.
In order to make the cylinder inner walls corrosion-resistant, they
are sandblasted and phosphatized. The outside surface is sand-
blasted and covered with zinc and ovenbaked epoxy painting.
The cylinder bottom is protected by a plastic foot that allows it to
remain upright during assembly of regulator, jacket and straps. It
is advisable to lay the scuba horizontally soon after the assembly
operation to prevent it from falling. This may always be danger-
ous with vessels under pressure.
The following necessary information about cylinder identification
and certification is stamped on the outer surface, in compliance
with UNI EN 1964-1:1999 standard, and in compliance with
97/23/CE (PED) Directive:
This includes in the relevant order:
• cylinder thread code (M 25 x 2); • reference standard (UNI EN
1964-1); • cylinder manufacturer identification data, serial num-
ber and manufacturing year • identification number of notified
board; • minimum design thickness; • cylinder weight without
accessories • nominal cylinder capacity in litres • working pres-
sure in bars; • hydraulic test pressure in bars; • inspector stamp;
• test year and month.
VALVES
Cressi-sub valves are sturdy and reliable. They connect the
cylinder to the regulator.
Cressi-sub valves stand out for their peculiar design. They are
modular and easy to carry.
As shown in picture 37-A and 37-B the one-outlet valve can be
easily turned into a two-outlet valve by removing the plug (10K)
and assembling the additional outlet (18K). The one-cylinder valve
can be turned into a two-cylinder valve by assembling the central
connection (20) and the side body (21K) as shown in picture 37-B.
The threaded connection between valve and cylinder is of M 25
x 2 type.
A safe connection between the cylinder valve(s) and the regula-
tor is ensured on demand using the connections described in
UNI EN ISO 12209-1-2-3 standards.
In fact, for regulator assembly, the valves feature an internal con-
nection which can be turned into a DIN connection by simply
removing the adapter (4K).
Cressi-sub valves have been designed to provide maximum
safety and ease of operation. Taps are considerably big and their
groovy surface makes it easier to operate them even when
wearing thick gloves. The openings at the base of the taps allow
the diver to easily check if the valve is open or closed.
SELF-CONTAINED UNDERWATER BREATHING APPARATUS «PORTER»
Rubinetteria 27-09-2005 15:09 Pagina 6
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