Page 23 - CNG ESP Participant Guide2024
P. 23

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
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