In article , Gary Coffman says...

The regulator is a feedback controlled valve. It is not a dissipative
device. It controls the mass flow of air from the tank such that a
particular set pressure develops against the flow resistance existing
downstream of the valve. It does not bleed excess air to atmosphere
in order to do this, it does not get perceptibly hot.

Indeed because expansion is occuring inside the regulator,
under certain conditions, they may start to chill preceptably.

SCFM *is* a measure of mass flow. At equilibrium flows, the mass
flow into the valve *is* the same as the mass flow out of the valve.

Right! Otherwise, the darn thing's gonna get so heavy
it will tip over the tank.

Jim

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