Patent ID: 8388323

Claim:
A pump for pumping a liquid, the pump comprising: an inlet; an outlet; a pumping chamber for receiving the liquid from the inlet; and an actuator arrangement operable between a first position and a second position and arranged to pump the liquid from the pumping chamber into the outlet, the actuator arrangement comprising a solenoid actuator comprising an armature, a solenoid coil, a pole element partly defining an electromagnetic circuit of said actuator arrangement, and a coil former to carry the solenoid coil, wherein the coil former is disposed around the pole element; wherein the inlet and the pumping chamber are in fluid communication with a supply passage when the actuator arrangement is in the first position, and the supply passage extends into or around the solenoid coil and is defined radially between the coil former and the pole element so as to allow transfer of heat from the actuator arrangement to the liquid.