Fuel pressure regulator working principle:The size of oil by the spring and the gas chamber vacuum two coordinated, when the oil pressure is higher than the standard value, high pressure fuel will push the diaphragm moves up, open the valve, the excess fuel return pipe through reflux tank; when the pressure is lower than the standard value, the spring under the diaphragm valve will shut down, stop oil return. The role of pressure regulator is to keep the pressure in the oil path to keep constant, oil pressure is too low fuel injector injection is too weak or no fuel injection, oil pressure is too high to damage the oil circuit or injector damage.
The pressure regulator has an internal diaphragm, pressure control valve to open and close the role of oil pressure is lower than a certain value, the pressure valve is closed, the pressure oil from the oil pump internal pressure increase, when added to exceed the prescribed pressure, the diaphragm opens, the overpressure of the fuel through the oil return pipe flow back into the tank, play the role of decompression.