Which stage reduces working tank pressure to intermediate pressure?

Which stage reduces working tank pressure to intermediate pressure?

• A. The second stage
• B. The first stage
• C. The third stage
• D. The fourth stage

Answer: (B)

In scuba regulators, pressure is reduced in stages. The first stage attaches directly to the tank and drops the high tank pressure down to a manageable intermediate pressure so the rest of the regulator can operate safely. That intermediate pressure then feeds the second stage, where the gas is further reduced to ambient pressure as you inhale. So the stage that lowers tank pressure to intermediate pressure is the first stage. The second stage handles delivering gas at ambient pressure, while the third and fourth stages aren’t used for this initial reduction in a standard open-water setup.

In scuba regulators, pressure is reduced in stages. The first stage attaches directly to the tank and drops the high tank pressure down to a manageable intermediate pressure so the rest of the regulator can operate safely. That intermediate pressure then feeds the second stage, where the gas is further reduced to ambient pressure as you inhale. So the stage that lowers tank pressure to intermediate pressure is the first stage. The second stage handles delivering gas at ambient pressure, while the third and fourth stages aren’t used for this initial reduction in a standard open-water setup.