4. Regulator The Pressure Regulator reduces the CNG pressure from 200 bars (working pressure) to 4 bar. A 15 microns filter is inbuilt inside the Pressure regulator for filtering CNG coming from the tank. An electrical solenoid is also mounted on the Pressure regulator that allows and stops gas flow to Regulator. There is an over pressure relief valve which automatically opens if pressure inside regulator increases up to 10 ± 2 bar. A high pressure sensor is also connected on the inlet of the pressure regulator is used for displaying the quantity of CNG in the tank on the instrument cluster. Working Principle: The regulator supplies gas at the working pressure to the injectors. This is done by decreasing the pressure of the gas coming from the CNG tank (normally at 200bar) by expansion process. The output pressure is calibrated to maintain constant output pressure of 4 bar. Mounting Location: Pressure regulator is mounted in the Engine compartment on the firewall. A solenoid valve is integrated on the inlet of the pressure regulator. Technical Specifications of Solenoid coil: Nominal Voltage: 12V DC Operating voltage: 6V to 16V Current Consumption: 0.6 to 1.85 (at 20 degree Celsius) Resistance: 8.65 to 9.95 Ω (at 20 degree Celsius) The CNG Pressure Regulator is not a serviceable part. The CNG pressure regulator cannot be dismantled for service /but to be replaced with new one in case of any failure. However high pressure sensor, inlet connector and filter with gasket can be replaced on regulator removed from vehicle. CNG LP filteris mounted on bracket near to fusebox. SN PART DESCRIPTION TIGHTENING TORQUE 1 High Pressure Sensor Sensata 3.1 to 3.8 kg fm 2 SS Inlet Connector 2.8 to 3.4 kg fm 3 Filter with Gasket - NOTE Wrap 2 to 3 turns of Swaglok make Teflon tape on male threads 1/4 OD connector in clockwise direction. The first one or two threads of OD connector should be uncovered to avoid some part of Teflon tape going into adaptor. Do not reuse the same tape if external leakage is detected. 1.2L REVOTRON CNG PHASE-2 ENGINE 99
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