Filter arrangement for a selective catalytic reduction system

A reductant supply system for a selective catalytic reduction system, the reductant supply system comprising:

• a tank for holding reductant liquid;
• a suction tube mounted at least partially in the tank for receiving reductant liquid from the tank;
• and
• a filter arrangement mounted to the suction tube, the filter arrangement comprising:
• a restraining body comprising a distal body side;
• a filter extending at least partially across the distal body side of the restraining body and at least partially forming a filter chamber;
• a filter outlet from the filter chamber formed through the restraining body and/or filter;
• and
• a filter mount mounted to the restraining body and/or filter such that (a) the filter chamber is in fluid communication with the suction tube via the filter outlet and (b) the filter is on the distal body side of the restraining body to the suction tube,
• wherein the restraining body extends radially outwardly from the filter mount and suction tube and is configured to restrain the filter such that, under the effect of buoyancy in the tank in use, gas in the filter chamber is directed towards the filter outlet.

An engine system comprising an exhaust aftertreatment module for receiving exhaust gas from an internal combustion engine, the exhaust aftertreatment module comprising a selective catalytic reduction system, the selective catalytic reduction system comprising a reductant supply system, the reductant supply system comprising:

• a tank for holding reductant liquid;
• a suction tube mounted at least partially in the tank for receiving reductant liquid from the tank;
• and
• a filter arrangement mounted to the suction tube, the filter arrangement comprising:
• a restraining body comprising a distal body side;
• a filter extending at least partially across the distal body side of the restraining body and at least partially forming a filter chamber;
• a filter outlet from the filter chamber formed through the restraining body and/or filter;
• and
• a filter mount mounted to the restraining body and/or filter such that (a) the filter chamber is in fluid communication with the suction tube via the filter outlet and (b) the filter is on the distal body side of the restraining body to the suction tube,
• wherein the restraining body extends radially outwardly from the filter mount and suction tube and is configured to restrain the filter such that, under the effect of buoyancy in the tank in use, gas in the filter chamber is directed towards the filter outlet.