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Function
• Delivering reducing agent from the tank to the dosing systems
• Prefiltering RA by means of an integrated filter
• Safeguarding the supply of RA
• Maintaining minimum system pressure in the loop supplying the dosing systems and avoiding empty lines
by means of an integrated pressure-maintaining valve
• Maintaining reducing agent in a liquid state by means of an integrated heating functionality
The pump must always run whenever the SUs are in operation in order to cool the DUs. It must keep running
until the exhaust temperature upstream of the SCR system has fallen below 110 °C even after the engine
has been shut down (cooling mode).
The PFM is designed for a suction head of up to 3 m. The pressure-maintaining valve also sets the pressure
in the loop (approx. 1.5 to 2.5 bar abs.) to assist intake at the SUs. It also prevents any violation of the maxi-
mum admissible pressure for the return downstream of the DUs (approx. 2.5 bar abs.).
MS15065/01E 2019-01 | RA Dosing System | 83
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