Operation - CNG
The regulator (2) reduces the pressure to the fuel rail in two stages. The first stage (7) will reduce the high pressure supply from the cylinder tanks down to 230 PSI The second stage (1) will reduce the 230 PSI down to 163 PSI.
When the fuel pressure is reduced. The CNG internal of the regular can rapidly cool down, even freeze. To regulate the CNG temperature. There are passages through-out the regulator that allow engine coolant to pass through. Introduction engine coolant to the regulator will help insure that the regulator doesn't malfunction due to freezing.
The regulator contains a electronically controlled shut off valve (2) The device is used only as a safety and does not effect fuel system operation. The valve controls the flow of CNG through the regulator. The valve will stay closed stopping the flow into the regular. When energized from the CNG control relay, the valve opens allowing the fuel to flow.
The CNG control relay gets its power from the Automatic Shut Down (ASD) relay circuit. The control allows the power to the cylinder valves to energize (open) and the pressure regulator valve to energize (open).
The Pressure Regulator Assembly consist of:
- Low Side Pressure Regulator
- Electronically Controlled Shut Off Valve
- High Pressure Sensor
- Internal Filter
- Venting Valves
- Pressure Relief Valve
- High Side Pressure Regulator
- Engine Coolant Passages
- Solenoid Valve Electrical Connector