ISO 20766-19:2025

Road vehicles — Liquefied petroleum gas (LPG) fuel system components — Part 19: Gas-tube pressure relief valves

This document specifies general requirements and definitions of liquefied petroleum gas fuel (LPG) components, intended for use on the types of motor vehicles as defined in ISO?3833. It also provides general design principles and specifies requirements for instructions and marking.

This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) that use gaseous fuels in accordance with ISO?9162. It is not applicable to:

—???? fuel containers;

—???? stationary gas engines;

—???? container mounting hardware;

—???? electronic fuel management;

—???? refuelling receptacles.

Miscellaneous components not specifically addressed in this document can be examined for conformity with the criteria of any applicable part of the ISO?20766 series, including testing to the appropriate functional tests.

All references to pressure in this document are considered gauge pressures unless otherwise specified.

This document applies to devices that have a service pressure in the range of 110?kPa (butane rich at 20?°C) and 840?kPa (propane at 20?°C). Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).

Edition	2025
Standard Part No	19
Published Date	2025
Published By	International Standardization Organisation
Page Count	7