smaco S400 Plus, User Manual

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When the diver bites the mouthpiece and inhales, the pressure in the cavity
decreases to prompt the release valve to open downward so that the air
pressure is reduced in the primary pressure reducing valve and flows through
the medium pressure tube into the secondary breathing valve cavity and then
into the oral cavity through the mouthpiece;
OPERATION PRINCIPLE
3.1
When the diver bites the mouthpiece and exhales, the exhaled gas flows into
the cavity to increase the pressure in the cavity, so as to prompt the opening
of the one-way silicone gasket at the bottom of the secondary breathing valve,
and the gas is discharged to the outside through the two exhaust holes.
3.2
03
04
1
2
3