Historical
ANSI/(NFPA)T3.21.3-1990 (R1997)
Pneumatic Fluid Power - Flow Rating Test Procedure and Reporting Method - for Fixed Orifice Components
Provides test methods to measure the Cv rating and the sonic flow conductance parameters b and c. It will be expanded to include ISO sonic flow parameters. It will provide a common reference for test methods to be used on products.
National Fluid Power Association [nfpa-fluid]