This document specifies tests and requirements for the excess flow valve, a compressed natural gas 
(CNG) fuel system component intended for use on the types of motor vehicles defined in ISO 3833.
This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in 
accordance with the ISO 15403 series.
It is not applicable to the following:
a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the 
vaporizer;
b) fuel containers;
c) stationary gas engines;
d) container-mounting hardware;
e) electronic fuel management;
f) refuelling receptacles.rd edition 2020-09 Road vehicles — Compressed natural gas (CNG) fuel system components — Part 14: Excess flow valve Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 14: Valve de limitation de débit Reference number ISO 15500-14:2020(E) ？ ISO 2020 ISO 15500-14:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2020