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>Yes, I was running my regulator flat out into the needle valve. Unless
>there is quite a pressure drop across the valve, the flow will not go sonic
>and the valve will not restrict the flow as desired.
Sonic flow is achieved roughly when the upstream pressure is 2 times the
downstream pressure. And for a fixed opening ( a needle valve kept at a
constant setting ), increasing upstream pressure increases flow
regardless if you are sonic or not.