POSEIDON Besea D100, Руководство пользователя

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MDV
Manual Deflation Valve. A manually operated valve which permits
deflation of the BCD. This includes the APRV:s (see below),
the shoulder valve of the inflator when applicable, and the oral
inflation/deflation button on the inflator. The corresponding term
in EN 1809:1997 is MDD (Manual Deflation Device).
APRV
Automatic Pressure Relief Valve. A valve which automatically
prevents overpressurisation possibly harmful to the BCD. Often
referred to as OPV (Over Pressure Valve) or dump-valve. The
corresponding term in EN 1809:1997 is APRD (Automatic
Pressure Relief Device).