SCR DOSING SYSTEM

摘要

A pressurising means for a reagent dosing system (102) such as a urea dosing SCR system, wherein either the main reagent tank (112) is pressurised by a source of air pressure (114), or wherein a secondary vessel (130), containing a smaller volume of reagent, is pressurised by a source of air pressure (140), such as the vehicle expansion tank, wherein the secondary vessel (130) may include a flexible separating diaphragm (136) to separate a volume of air (138) from the secondary volume of urea (134).