Historique de l'étape n° 5 de Starbucks Barista Teardown

Modifications apportées à l'étape #5

Modifié par Andrew Bookholt — 31 juil. 2009

	[* red] Remove the two Phillips screws from the pump cylinder and lift it off the end of the pump, minding the two locking tabs near its base.
	[* black] The pump used in the Barista utilizes the electromechanical properties of a solenoid to pump water up from the reservoir.
-	[* red] An iron core placed in the center of a cylindrical coil of wire is reciprocated back and forth through the coil when AC voltage is applied to it. Springs on either end of the core absorb the kinetic energy each time the field changes polarity.
+	[* red] An iron core placed in the center of a cylindrical coil of wire is reciprocated back and forth through the coil when AC voltage is applied to it. Springs on either end of the core absorb the core's kinetic energy each time the field changes polarity.
	[* orange] This core is attached to a plunger (shown in green) that fits tightly into a cylinder which creates the pumping action when the core moves back and forth.
	[* yellow] The differential pressure between the inside of the cylinder and the water tank causes water to be drawn up from the reservoir into the pump whenever the steam valve is opened to assure the boiler is supplied with water.