Patent ID: 7249749

Claim:
A solenoid valve for controlling the flow of a control fluid, comprising: a coil wound around a coil bobbin; a fixed core located in the coil and protruding downward from the coil; a valve seat; a plunger supported under the fixed core by a plate spring; a valve sheet held in the plunger and normally retained in contact with the valve seat; the valve sheet being capable of separating from the valve seat against the spring force of the plate spring when the coil is energized, wherein the fixed core comprises two parts vertically coupled, an upper one of which is a first fixed core located in the coil bobbin and in non-contact with the control fluid, the first fixed core being made of a material having high magnetic permeability, and a lower one of which is a second fixed core fit, protruding downward, in the coil bobbin to cover a lower end of the coil bobbin, the second fixed core being made of a material having corrosion resistance to a high-corrosive control fluid, the material of the first fixed core being different than the material of the second fixed core.