Fox critical flow nozzles
Since 1961, Fox critical flow nozzles, also called
sonic chokes, have been used to maintain stable
gas flow rates in systems where maintaining stable,
accurate gas flow rates is essential to overall
system performance. By establishing a shock wave
in the venturi, the sonic choke establishes fixed
flow rates unaffected by ∆P or any fluctuations,
surges, or changes in downstream pressure. With
no moving parts, sonic chokes provide the simplest
and most reliable way to regulate gas flows. This
is particularly true when high pressure, high
temperature, cryogenic, explosive, or high purity
gasses need to be regulated.
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