Historical
NFPA/T3.5.15M-1986 (R2018)
Hydraulic fluid power - Valves - Method for determining the internal leakage characteristics
This Standard specifies procedures for the determination of leakage characteristics of any fluid power valve, and is intended to provide a uniform laboratory procedure for obtaining and reporting the fluid flow across a valve element which is considered blocked.
National Fluid Power Association [nfpa-fluid]