Valve Flow Calculator (Imperial Units) Air Pressure COPYRIGHT � 1997-2004 Pneumatics Online Pneumatics Online is THE Reference Source of the Pneumatics Industry… PSIBore SizeInchesRoom Temperature�FStroke LengthInchesStroke TimesecondsNumber of CylindersPressure DropPSI VolumeCubic InchesCv FactorInstantaneous FlowSCFMTotal System FlowSCFM