Upper Canister
&
Breathing Loop
Upper Canister
The Upper Canister primarily protects the
Counterlungs and unites the Top Head,
Counterlungs and CCR Head into one piece.
It is made of Delrin tubing and is densely
perforated to allow easy water flow into and out
of the canister when the Counterlung is
working.
The Upper Canister has an integrated door
secured by two locks for easy access to
Counterlungs for removal, rinsing and
drying.
The Canister door can be optionally with
a hole for fixing the 2L/200 bar oxygen
cylinder or smooth without the cylinder
hole.
The Upper Canister is equipped with a
fastening eye with easy relocation. More
hanging eyes can be added to the
Upper Canister as needed by the diver.
FLEX2 Counterlungs
The FLEX2 CCR is equipped with 3D shaped Counterlungs designed as gas-tight bags of
a half cylinder shape, made of soft Cordura with PU coating.
The Counterlungs are equipped with the unique and secure Click-Lock Bayonet Couplers
and the inner snorkel preventing water to flow directly to the scrubber.
The exhalation counterlung is equipped with an adjustable
Over pressure / dump valve allowing to drain eventual water
easily. The over pressure / dump valve can be operated manually
by pulling the string.
The Counterlungs are integrated in the Upper canister and are
connected to the CCR Head and Top Head via the Click-Lock
Bayonet Couplers with different keying on each bayonet
connector, which makes it impossible to connect the
counterlungs incorrectly.
The Counterlungs can be easily removed for cleaning,
disinfection, drying or storing.
Top Head
is the connection point for breathing hoses, Counterlungs, and all LP hoses.
The Top Head carries 2 locks securing the Upper Canister door, stainless steel handle and
ADV – Automatic Diluent Valve with adjusting knob.
It is equipped with hose connectors
on the upper side and the
Counterlungs connectors on the
underside. The connectors have
the unique bayonet Click-Locks
with different keying on each
connector preventing incorrect
connection of the breathing
loop.
The Top Head is firmly connected to the Upper Canister.
ADV
The ADV – automatic diluent valve is integrated into
the Top head on the underside.
The ADV is designed in a similar way like a 2nd
stage regulator. It is activated by a negative
pressure in the breathing loop and automatically
adds diluent to the breathing loop when
needed.
The ADV is fed by an LP hose leading from the Diluent MAV. The LP hose is connected via
the Shut-off Valve that can shuts off diluent gas when needed. The Shut-off valve is
operated by sliding the black switching ring up or down. It is useful if the diver wants to
have the adding of diluent under full control or in case of malfunction of the ADV.
MAVs – manual adding valves
For adding gases to the breathing loop, the FLEX2 CCR is equipped with
standalone manual adding valves (MAVs) located along the Upper
Canister.
The Oxygen MAV
is intended for manual addition of oxygen to the breathing loop.
The Oxygen MAV is attached to the LP hoses and placed loosely
along the Upper Canister or is optionally bolted directly to the
Upper Canister in a defined position.
The Oxygen MAV has one outlet controlled by the manual push-
button for adding oxygen to the breathing loop and is connected
via an LP hose to the Oxygen injection port on the Top Head.
The Oxygen MAV is connected to the on-board cylinder or eventually
via a quick connect coupler located below to an off-board cylinder.
The Diluent MAV
has 3 outlets, where the outlet controlled by the manual push-
button is connected via an LP hose to the Diluent injection
port on the Top Head, while another two outlets are
connected directly to the gas supply and are used for
supplying the ADV and SM BOV Neo (if used).
The Diluent MAV is connected to the on-board cylinder or via
a quick connect coupler located below to an off-board
cylinder.
The Oxygen MAV is attached to the LP hoses and placed
loosely along the Upper Canister
Side-mount BOV Neo (the Bail-Out Valve)
SM BOV Neo is a Bail-out Valve with a 2nd stage regulator incorporated into the mouthpiece with
the ability of supplying the diver with open circuit breathing gas when needed.
The CC/OC valve allows easily and fast to switch between the close
circuit (the CC mode) and the open circuit (OC mode) by one
hand. It is operated by rotating the knob on the front of
the SM BOV.
When the SM BOV is switched to the CC mode – the
breathing loop is open via the mouthpiece and allows
the diver to breathe on the rebreather closed circuit.
When the SM BOV is switched to the OC mode – the
breathing loop is closed and allows the diver to
breathe on open circuit via the 2nd stage regulator. In
this position no water can enter the breathing loop even
when the BOV is out of the diver’s mouth and
submerged.
One-way directional valves (mushroom valves) provide
and ensure the correct breathing gas circulation in the
breathing loop in the correct direction from left to right, from
the inhalation counterlung to the exhalation counterlung.
The SM BOV 2nd stage regulator is supplied with diluent via the
LP hose running parallel to the breathing hoses and connected
to the Diluent MAV via the Shut-Off Valve.
Breathing hoses are connected to the SM BOV via the
unique and secure Click-Lock Bayonet Connectors. It is
impossible to connect the breathing hoses incorrectly
due to different keying on each bayonet connector
on the loop.
Side-mount DSV (the Diver Surface Valve)
The SM DSV is a Diver Supply Valve allowing
to open and close the mouthpiece and
breathing loop. It is operated by rotating the
knob on the front of the SM DSV by one
hand.
When the SM DSV is switched to the OPEN
mode – the breathing loop is open via the
mouthpiece and allows the diver to
breathe on the rebreather closed circuit.
When the SM DSV is switched to the CLOSE
mode – the breathing loop is closed and in
this position no water can enter the
breathing loop even when the BOV is
out of the diver’s mouth and
submerged.
One-way directional valves
(mushroom valves) provide and
ensure the correct breathing gas
circulation in the breathing loop
in the correct direction from left to
right, from the inhalation
counterlung to the exhalation
counterlung.
Breathing hoses are connected to the SM DSV
via the unique and secure Click-Lock Bayonet
Connectors with one L-90° Coupler.
It is impossible to connect the breathing hoses incorrectly
due to different keying on each bayonet connector on the loop.
Learn more about FLEX2 CCR: