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Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
Function & Design
Introduction
Introduction
Function & Design
The Atlas/Yukon second stage features a high performance, low volume
design with a mechanically balanced valve. Here's how it works:
▼
Intermediate pressure air (140 psi) enters through the inlet
coupling and orifice (1), where it meets the poppet and LP
seat. The poppet spring (2) holds the poppet against the
orifice with a pre-set tension that counteracts the intermediate
pressure. The poppet is balanced between the two forces.
▼
Airflow is actuated upon inhalation or purging, when the
diaphragm is drawn down over the lever (3). This pulls the
poppet away from the orifice.
▼
Air and water are channeled to flow out through the exhaust
valve (4), which is designed to minimize exhalation resistance
while keeping the case internally dry in all positions.
▼
(Atlas only - not shown) A dive/pre-dive switch can be set to
minimize or boost peak venturi airflow, according to the
diver's preference.
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