Page 65 - AFVi CNG & LNG Participant Guide

Module 8: LNG Vehicle Systems and Safety Practices

Internal Check  Located inside plumbing manifold on tank
Valve  Provides 2 psi back pressure
 Assists Pressure Control Regulator in rapidly
reducing tank pressure

Engine Coolant Heat
Exchanger

 Uses heat from engine coolant for warming
 Warms LNG, changes state from liquid to gas

LNG Over-Pressure  Regulates maximum pressure to engine fuel
Regulator inlet
 Typically set at 125 psi
 May be externally adjustable

Automatic Fuel  Shuts off fuel to engine when ignition is off
Shutoff Valve o Activated by sensor
 On integrated tanks
o Valve is either located directly after the fuel vaporizer/heat exchanger or after
the overpressure regulator

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