ASME MFC-7 pdf download Measurement of Gas Flow by Means of Critical Flow Venturis and Critical Flow Nozzles SCOPE AND FIELD OF APPLICATION This Standard applies only to the steady flow of single-phase gases through critical flow venturis (CFV) of shapesspecified herein also sometimes referred to as critical flow nozzles (CFN), sonic nozzles, or critical flow venturinozzles). This Standard applies...