- Mouthpiece
- Exhaling valve to air
- Exhaling non return valve
- Inhaling non return valve
- Two way valve
- Co 2 absorbent canister
- Inhaling breathing bag
- Exhaling breathing bag
- pressure release valve
- Hose to oxygen cylinder
- Over the head retaining strap
For the first eight
minutes the two way valve (5) is operated in the horizontal position so
inhaling from the bag (7) through the non-return valve (4) in the mouth
piece. Exhalation is through the mouthpiece non-return valve (3)
straight to the atmosphere. The bag is toped up by using the by-pass
valve on the reducing valve in the chamber.
After eight minutes the valve (5) is operated in the vertical position
and still inhaling as before the exhaled air enters the exhaling bag (8)
after passing through the potash canister (6) and back into the inhaling
bag. Oxygen supply is maintained by the automatic flow from the reducing
valve.
At the end of each decompression stage or at intervals when the
breathing bag becomes fully distended the exhale bag is emptied by
pressing on it and squeezing the gas out through the release valve (9) .
The top-up is then repeated by working the by-pass valve again. . The
eliminates the nitrogen being given off by the body and refreshes the
oxygen in the system.