21419969 Volvo NH12 D12C Overflow Valve

What does an overflow valve do?

This injector pump overflow valve is a critical pressure control component that maintains the internal pressure balance of the fuel injection pump by redirecting excess fuel back to the return line. By regulating the recirculated fuel volume at a specific pressure threshold, it ensures consistent fuel delivery and prevents pressure spikes within the system.

Vehicle and engine compatibility

This specific part is compatible with Volvo NH12 trucks equipped with D12C engines. It serves as a reliable solution for workshop technicians and fleet managers looking to restore engine stability and optimal fuel consumption in heavy commercial vehicle applications.

Installation and maintenance

When performing installation, ensure the M10x1 thread size is correctly seated to prevent leaks or pressure drops. It is recommended to inspect the surrounding fuel lines and seals during replacement to ensure the system remains airtight and free from air ingress.

Troubleshooting and selection

If engine idle stability decreases or fuel consumption increases, the overflow valve should be inspected for proper operation. Selecting a high-strength component ensures long-term durability under demanding operating conditions. Consult your authorized distributor.

OE cross-reference

0103 064 (Injector Pump Overflow Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21419969.