New back pressure valve (BPV) for DAF CF/XF

The OE valve code 2426257 is a BPV (Back Pressure Valve) used on PACCAR MX-11 engines fitted to the latest generation DAF trucks (XF and CF Euro 6 family).
It is a component inserted into the exhaust system immediately downstream of the turbocharger, consisting of a butterfly-valve body and an integrated actuator, and its role is to manage the back pressure of the exhaust gases for engine brake functions, emissions control and turbocharger protection.

Technical characteristics

• Component type: Butterfly valve inserted in the exhaust pipe after the turbo.
• Vehicle location: Installed in the exhaust line, shortly after the turbocharger outlet; flanged interface to the pipe (normally inner Ø ~100 mm, variable depending on version)
• Mechanical configuration: cast iron or high-strength steel body, suitable for high exhaust temperatures; internal butterfly on a shaft with lubricated or self-lubricating bearings/bushings; external plate with linkages and spring returns for butterfly actuation
• Actuation and sensors: Integrated electric actuator (motor + gearbox) connected via 12/24 V wiring; electronic control via PACCAR engine ECU (command signal and position feedback).

DIPA can intervene to overhaul these components thanks to its experience and expertise.

Functions

• Exhaust back pressure control. Modulates the butterfly opening to increase or reduce back pressure in the exhaust manifold. Back pressure is used to optimize combustion, EGR management and gas temperature.
• Support for the engine brake. During deceleration, partial closing of the valve increases exhaust resistance, contributing to the engine's braking power. It works in combination with other systems (e.g., PACCAR integrated engine brake, valve timing management, VTG where present).
• Support for DPF regeneration. During particulate filter regeneration, the BPV is commanded to raise exhaust gas temperatures, increasing back pressure and promoting the thermal conditions for particulate combustion in the DPF.
• Protection of the turbocharger and the forced-induction system. Helps maintain exhaust and boost pressures within safe limits, avoiding thermal and mechanical overloads on the turbocharger. In fault conditions it can be partially closed/opened to protect sensitive components.
• Optimization of emissions and fuel consumption. Proper BPV operation contributes to keeping NOx, particulate and fuel consumption parameters stable: back pressure, EGR, SCR temperature and exhaust gas management.

Model applications

• DAF XF
• DAF CF

Typical faults

• Loss of power, sluggish acceleration response
• Jerking or irregularities during acceleration and deceleration
• Increased fuel consumption
• Black smoke from the exhaust, particularly during acceleration

Final conclusions

The OE valve 2426257 is one of the key components in PACCAR MX-11 engines fitted to DAF XF and CF Euro 6 trucks: it controls exhaust back pressure, supports the engine brake, contributes to DPF regeneration and protects the turbocharger.

DIPA offers a wide range of spare parts dedicated to the Truck sector, construction vehicles and industrial equipment. Not only that: it supplies overhauled components with like-new performance that can provide savings on replacement while contributing to environmental protection through the circular economy. If the part you need is not available, don't worry: DIPA can overhaul your unit "on demand", restoring full functionality and safety in a short time.