Engine C4.4 C6.6, excavator 311D 312D 314D 320D, fuel rail pressure relief valve 4167101 416-7101

Fuel Rail Pressure Relief Valve 4167101 416-7101 for C4.4, C6.6, and Excavator Models 311D, 312D, 314D, and 320D Engines

The fuel rail pressure relief valve (also known as a pressure limiting valve, abbreviated as PRV or PLV) is a critical safety device in the common rail fuel system. It is primarily used to control the fuel pressure within the high-pressure fuel rail, preventing system damage due to excessive pressure.

Pressure Protection: When the fuel rail pressure exceeds a set threshold, the pressure relief valve automatically opens, releasing excess fuel to the return line, preventing damage to the engine or high-pressure components.

System Stability: By dynamically adjusting the pressure, it ensures the fuel injection system operates within a safe range, guaranteeing normal engine operation.

Fault Response: It is divided into active opening (ECU control) and passive opening (mechanical pressure triggering), commonly seen in scenarios such as rail pressure sensor failure and fuel metering unit malfunction.

Abnormal opening of the pressure relief valve may be caused by return line blockage, rail pressure sensor damage, ECU malfunction, or injector jamming. During repairs, it is necessary to check the specific vehicle model, such as checking the low-pressure oil circuit or replacing the high-pressure pump.