NBN ISO 15500-4:2021

This document specifies tests and requirements for the manual 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 ISO 15403-1.
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.