Method pertaining to an SCR system and an SCR system

An SCR system configured to dose reducing agent into an engine exhaust duct upstream of a SCR catalytic converter for reducing the NOx level in an exhaust flow from the engine, wherein the SCR system comprises:

• a dosing valve configured to dose under pressure the reducing agent to the exhaust duct;
• a pressurizing pump configured to feed the reducing agent from a container to the dosing valve;
• and
• a controller comprising a processor configured and operable to start a period of non-dosing of reducing agent by turning off, at a first time, dosing of the reducing agent, and then at a second time subsequent to the first time, during the period of non-dosing, to reduce a pressure of the reducing agent at the dosing valve compared to the pressure during dosing,
• wherein during the reducing of the pressure of the reducing agent, operation of the pump is continued maintained,
• wherein a time interval from the first time to the second time is a first predetermined time interval, and during the first predetermined time interval the pressure of the reducing agent at the dosing valve is maintained without reduction compared to the pressure during the dosing.