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Analysis of High Voltage Common Rail Tube Technology

2024-02-21

The high-pressure common force pipe is a forged steel pipe with an inner diameter of 10mm for the fuel rail. The fuel injectors of each cylinder are connected to the fuel rail through their respective oil pipes.
The role of a common rail tube can be understood as two points:
1. Accumulate and distribute high-pressure fuel;
2.Reduce pressure fluctuations: fluctuations caused by intermittent fuel supply of the plunger; The fluctuation caused by the brief injection of the fuel injector;


The function of the pressure relief valve of the high-pressure common rail pipe is to limit the pressure in the oil rail by opening the overflow port when the pressure limit value is exceeded. It is kept closed by the conical head of the plunger and the sealing seat of the valve body. Under normal pressure, the spring tightly presses the plunger on the sealing seat, keeping the common rail pipe closed; When the pressure exceeds the maximum system pressure, the spring is compressed, the plunger is lifted, fuel overflows from the fuel rail, and the fuel rail pressure decreases.
A restrictor is required between the common rail and each cylinder to ensure the safety of the engine, limiting the flow from the common rail to the nozzle and protecting the engine from overload. This is a device that mechanically ensures that it is not damaged when the solenoid valve of a certain cylinder fails.