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QID - 27324 What is the function of the bypass valve on the self-contained breathing apparatus? The valve reduces the high pressure in the bottle to about 3 psi above atmospheric pressure.
The valve opens in excessive heat to release the oxygen in the bottle and prevent the bottle from exploding.
In the event of a malfunction in the equipment, the valve can be operated manually to give the wearer air.
When pressure in the apparatus exceeds 7 psi above atmospheric pressure, the valve opens to release pressure.
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