A. The valve opens in excessive heat to release the oxygen in the bottle and prevent the bottle from exploding. B. In the event of a malfunction in the equipment, the valve can be operated manually to give the wearer air. C. When pressure in the apparatus exceeds 7 psi above atmospheric pressure, the valve opens to release pressure. D. The valve reduces the high pressure in the bottle to about 3 psi above atmospheric pressure. « Previous Next »
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