Home » W.A. Kates Flow Controllers » Kates FC Valve Automatic Flow Rate Controller
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Downstream pressure fluctuations are counterbalanced by the internal regulating valve to maintain the SCFM to within 1-1/2% of the flow setting. Variations in upstream pressure and temperature should be minimized due to the compressibility of gases and the corresponding changes in density. The ratings of Kates FC Valves are catalogued in gal/min for purposes of standardization.
Flow rate through an orifice is proportional to the size of the restriction and the differential pressure across it. By combining an adjustable orifice with an internal regulating valve, the Kates controller will maintain a constant pressure drop across the metering orifice.
P1=P2 + Spring Force
For example; if supply pressure (P1) increases, the resulting momentary pressure imbalance
immediately moves the impeller downward. This action restricts the valve ports thus increasing orifice backpressure
(P2), restoring differential pressure and the flow rate to the original settings. The unit will respond equally as well
to an upset in outlet pressure (P3).
