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Converting Festo’s flow rate spec to Cv
by: Nate Laverdure
Festo gives the flow rate through their solenoid valves in terms of “standard nominal flow rate”. What does this mean?
Festo gives the flow rate through their solenoid valves in terms of “standard nominal flow rate”. What does this mean? How does it compare with other valves on the market?
Here’s a spreadsheet that converts the specified flow rate (which is actually a mass flow rate even though it’s in units of volume/time) into a flow coefficient or Cv. This lets you directly compare the size of the valve to other vendors’ stuff.
The attached example is for the KOP FESTO solenoid valve, the VUVG-LK10-B52-T-M7-1H2L-S (aka part number 8042548). This is the valve that’s available right now on FIRST Choice here. Here’s the spec sheet which doesn’t list a Cv, but instead gives a flow rate of 340 liters/minute of dry air at standard temperature and pressure (“STP”) when the inlet pressure is 6 bar and the outlet pressure is 5 bar. The Cv of this valve is 0.53.