Page 23 - CNG/ LNG ESP Participant Guide 2024

Module 2: High-Pressure CNG Fuel System Components

Defuel Receptacle ▪ Connection to the defueling hose that
and Valve allows gas to be removed from the
high-pressure fuel system

Three-way
Valve

Receptacle

High-Pressure Fuel
Flexible Fuel Line
Lines, Tubing and
Fittings

Rigid Fuel Line
(Stainless-Steel)

▪ Carry gas from the receptacle to the cylinder, and to the high-pressure side of the
regulator
▪ Can be made of rigid or flexible material
▪ May have both materials on the same vehicle

Fittings: O-Ring Face
Double Ferrule Fitting O-Ring Face Seal Fitting
Seal and Double
Ferrule
Nut
O-Ring
Back Ferrule

Front Ferrule

Fitting

Body

▪ Connect sections of high-pressure tubing to each other and/or components
▪ Double Ferrule – most commonly used

NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 2-5