Historical
ANSI/(NFPA)T3.5.28 R1-1997 (R2004)
Hydraulic fluid power - Valves - Pressure differential-flow characteristics - Method of measuring and recording
This standard includes: the determination of the pressure differential-flow characteristics of any fluid power valve; a uniform method of presenting the test data; standardized information for conducting comparative tests.
National Fluid Power Association [nfpa-fluid]
