Deflating Via The Dual Exhaust Valve - Aqua Lung MDB Technical Manual

14
Deflation via Dual Exhaust Valve
Inside the inflator's corrugated hose is a nylon line that attaches the inflator to the dual valve at
the top of the airway assembly. You can vent air from the MDB by firmly pulling straight down on
the inflator. Once resistance is felt, only a pull of 7mm (.25 in) is required. The Rapid Exhaust
Valve (REV) provides an effective and convenient way to vent air from the BC while in either an
upright or face down swimming position (Fig. 8). It also functions as an Over Pressure Relief Valve
(OPRV) that will open automatically to relieve excessive air pressure. This feature is very critical
for preventing stress or damage to the BC's bladder (Fig. 9).
cAutIoN: the proper function of the overpressure relief valve is vital to prevent
damage to the Bc bladder. unauthorized service or tampering may render these
valves inoperable, and could cause the bladder to leak or burst. this type of damage
is not repairable and is not covered under warranty.
WARNING: most training agencies recommend that you descend in an upright, feet-
first position, in order to maintain a slower and more controlled descent. This is es-
pecially true if you experience difficulty equalizing your ears or if you are descending
in low visibility conditions.
Fig. 8
mDB technical manual
Fig. 9