A linear solenoid valve for generating an electromagnetic force in proportion to an amount of current supplied to a solenoid and displacing a valve element under the generated electromagnetic force,MULTI-FUNCTIONAL WATER PUMP CONTROL VALVE comprising: a valve casing including a valve body having an inlet port and an outlet port for passage of a fluid under pressure therethrough, and a housing joined to said valve body; Forged Steel Valvesa solenoid mounted in said housing and having a coil wound around a cylindrical pipe made of a nonmagnetic metal material with an insulating film interposed therebetween, Butterfly Valvesa fixed core, a movable core for being attracted to said fixed core when said coil is energized, and a tubular yoke surrounding said movable core; and a valve mechanism mounted in said valve body and having a valve element for selectively bringing said inlet port and said outlet port into and out of fluid communication with each other responsive to a displacement of said movable core; said movable core having a nonmagnetic layer formed on an outer surface thereof and having a predetermined thickness; said tubular yoke and said fixed core being press-fitted in and held coaxially with a hole defined in said pipe.

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