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zxcvbob - Then prove it.
The assertion: That a needle valve is not a valve unless the gas passing
through it reaches the speed of sound.
That is the assertion that I ridiculed. Prove me wrong.
Don't conjure up some high-pressure, high volume jet engine example. Let's
say around 20 - 40 psi in, around 2 - 5 bubbles per second out, using a
typical off the shelf needle valve. You assert that the valve will not act
*as* a valve unless the gas passing through it reaches the speed of sound.