FIELD: security facilities.
SUBSTANCE: underwater breathing device such as a set of a mask with a snorkel which can be fitted with an exhalation valve is proposed. The exhalation valve comprises a plate with at least one chamber exhalation hole placed opposite the exhalation hole. The exhalation valve comprises also a flexible membrane that can be pulled over the plate surface and is dimensioned and placed so that it can serve as a seal for the exhalation valve. The flexible membrane has a sealed position in which it seals the exhalation hole so that the exhaled air does not escape from the underwater set of a mask and a snorkel. The flexible membrane has an unsealed position in which the exhaled air escapes from the underwater set of a mask and a snorkel.
EFFECT: positive pressure of the exhalation end in the air duct of the user of the underwater breathing device in order to decrease the total work of the underwater breathing.
14 cl, 38 dwg
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