In an emergency where the oxygen flush is pressed at a remote location, which component is NOT bypassed during 100% oxygen delivery?

In an emergency where the oxygen flush is pressed at a remote location, which component is NOT bypassed during 100% oxygen delivery?

• A. O2 flowmeter
• B. First stage regulator
• C. Vaporizer check valve
• D. Vaporizers

Answer: (B)

The key idea is that an O2 flush delivers 100% oxygen by bypassing the vaporizing and metering components so the circuit receives a rapid, high-concentration O2 flow. The flush valve taps the intermediate-pressure system after the first stage regulator, delivering directly to the common gas outlet. Because the gas comes from the regulated, reduced-pressure source, the first stage regulator remains in the path and is not bypassed. In contrast, the flowmeter and vaporizers (and their check valves) are bypassed so the gas doesn’t pass through these components. Keeping the first stage regulator in the path ensures safe pressure is maintained while providing the rapid 100% O2 flush.

The key idea is that an O2 flush delivers 100% oxygen by bypassing the vaporizing and metering components so the circuit receives a rapid, high-concentration O2 flow. The flush valve taps the intermediate-pressure system after the first stage regulator, delivering directly to the common gas outlet. Because the gas comes from the regulated, reduced-pressure source, the first stage regulator remains in the path and is not bypassed. In contrast, the flowmeter and vaporizers (and their check valves) are bypassed so the gas doesn’t pass through these components. Keeping the first stage regulator in the path ensures safe pressure is maintained while providing the rapid 100% O2 flush.