Patent ID: 7748684

Claim:
A flow control valve comprising: a valve body provided with an inlet passage, an outlet passage, a valve chamber which provides communication between the inlet passage and the outlet passage, and a valve seat formed in a communication area between the valve chamber and the outlet passage; a coil including wire wound on a hollow coil bobbin; a first fixed core fixed in an upper part of the coil bobbin; a second fixed core fixed in a lower part of the coil bobbin; a nonmagnetic flared pipe including a cylindrical part fixed to the first fixed core and a disc part formed around the periphery of a lower end of the cylindrical part, part of the disc part being held between the second fixed core and the valve body; a movable core placed slidably in the cylindrical part of the flared pipe and provided at its lower end with a valve element; and a spring that always urges the movable core in a direction to move away from the first fixed core to bring the valve element into contact with the valve seat; the movable core being formed at its lower end with a flange part having a diameter larger than an inner diameter of the coil bobbin, the flange being placed in the valve chamber, and a distance between the first fixed core and the movable core is set to be larger than a distance between the flange and the disc part of the flared pipe while the valve element is in the valve seat.