| 摘要 |
An EBA system is provided which includes a primary source of pressurized air, a secondary source of pressurized air, hoses leading the primary and secondary sources of pressurized air to an EBA valve, and two hoses for directing pressurized air to the interior of a protective suit for over-pressurization and to a mouthpiece of a user. The valve is constructed and arranged to operate under two modes of operation, in one of which air from the primary air source is directed to an over-pressurization hose and an inhalation hose while air from the secondary air source hose is blocked, and a second mode in which air from the secondary or auxiliary supply is directed to the inhalation hose but not to the pressurization hose.
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