ISO 12614-8:2021 Road vehicles — Liquefied natural gas (LNG) fuel system components —Part 8: Excess flow valve

标准简介

Road vehicles — Liquefied natural gas (LNG) fuel system components —Part 8: Excess flow valve是于2021‑06‑04发布的ISO标准，适用于国际范围。

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INTERNATIONAL STANDARD ISO 12614-8:2021

Road vehicles — Liquefied natural gas (LNG) fuel system components —

Part 8: Excess flow valve

1 Scope

This document specifies tests and requirements for the excess flow valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is applicable to vehicles using natural gas in accordance with ISO 154031‑ (mono‑fuel, bi‑fuel, or dual‑

fuel applications). It is not applicable to the following:

a) fuel containers;

b) stationary gas engines;

c) container mounting hardware;

d) electronic fuel management;

e) refuelling receptacles.

It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests.

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

1)

This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa (16 bar ). Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 126141‑ , Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General requirements and definitions

ISO 12614‑2 , Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 2: Performance and general test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 126141‑ and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

2

1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm .

ISO 12614-8:2021

— IEC Electropedia: available at https://www.electropedia.org/

3.1

internal excess flow valve

excess flow valve installed inside the cylinder or cylinder valve

3.2

external excess flow valve

excess flow valve installed outside the cylinder or cylinder valve

3.3

shut-off type excess flow valve

excess flow valve that stops flow when in the closed position

3.4

flow-limiter type excess flow valve

excess flow valve that limits flow when activated

Note 1 to entry: The device resets automatically when the excess flow condition is no longer present.

3.5

activation

differential pressure flow or other condition specified by the manufacturer at which the excess flow valve is activated

4 Marking

Marking of the component shall provide sufficient information to allow the following to be traced:

a) the manufacturer’s or agent’s name, trademark, or symbol;

b) the model designation (part number);

c) the operating specifications (working pressure, temperature range, excess flow valve type, activation flow, or ΔP, maximum flow when activated);

d) the direction of flow (when necessary for correct installation).

The following additional markings are recommended:

i) the type of fuel;

ii) electrical ratings (if applicable);

iii) the symbol of the certification agency;

iv) the type approval number;

v) the serial number or date code;

vi) a reference to this document (i.e. ISO 12614‑8).

NOTE This information can be provided by a suitable identification code on at least one part of the component when it consists of more than one part.

5 Construction and assembly

The excess flow valve shall comply with the applicable provisions of ISO 126141‑ and ISO 12614‑2 , and with the tests specified in Clause 6.

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