Valve solenoid with improved performance

A system, comprising;

• an exhaust reductant storage tank;
• a pumping assembly, including:
• a valve;
• and
• a valve solenoid coupled to the valve, the valve solenoid including:
• a coil pot defining an internal volume,
• a coil positioned concentrically within the internal volume and spaced apart from the coil pot,
• an outer tube positioned concentrically within the coil,
• a pole core including a pole core first portion, a pole core second portion and a pole core third portion, the pole core first portion positioned concentrically within the outer tube and the pole core second portion positioned outside the outer tube,
• an armature including an armature first portion and an armature second portion, the armature first portion positioned distal from the pole core and outside the coil pot, the armature second portion extending from the armature first portion towards the pole core, at least a portion of the armature second portion positioned concentrically within the outer tube, the armature defining a channel therewithin,
• an inner tube, at least a portion of the inner tube positioned concentrically within the channel defined by the armature such that the at least a portion of the armature second portion is positioned concentrically between the outer tube and the inner tube,
• an armature pin fixedly coupled to the armature proximal to the armature first portion, at least a portion of the armature pin positioned within the channel, an end of the armature pin distal from the armature coupled to the valve, and
• a biasing member positioned within the channel, a first end of the biasing member coupled to the armature pin and a second end of the biasing member coupled to the pole core, the biasing member configured to exert a biasing force on the armature pin in an axial direction away from the pole core;
• and
• a selective catalytic reduction system in fluidic communication with the pumping assembly via the valve, the selective catalytic reduction system including at least one catalyst formulated to treat an exhaust gas flowing through the SCR system in the presence of the exhaust reductant.