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8.4 Deflating the BC with the Deflate Button
Assume a head-up position in the water. Raise the TEK BPI unit above and in front of
your face (this ensures the unit will be postioned above the aircell of the BC). Depress
the Deflate button and visually confirm that gas is escaping from the unit. For best
control, let gas out in a series of short, measured amounts, while observing the effects
on your buoyancy.
8.5 Deflating the BC with the Dump Valve
On S-TEK 30, 40 and 60 Wings, a
manual Dump/Over Pressure Valve
is located on the inside lower left
position of the bladder (fig. 17).
The Over Pressure Valve prevents
over-inflation of the BC. If the
internal pressure exceeds the spring
pressure in the Over Pressure Valve,
the valve automatically opens and
releases gas to prevent damage to
the BC. The valve will automatically
close when the internal pressure is
lower than the spring pressure in the
Over Pressure Valve.
Over Pressure Valves located at
the lower rear of the bladder are
equipped with lanyard and pull
knob. This lower dump valve can
be manually activated when the
diver is in a horizontal or head-down
orientation in the water, positioning
the valve at the highest point of the
air bubble for easy deflation.
fig. 17
