Valve device

摘要

PROBLEM TO BE SOLVED: To provide a valve device in which a decrease in magnetic efficiency of a magnetic circuit in an electromagnetic drive unit is prevented. SOLUTION: A cylindrical plunger in which an electromagnetic drive unit 4 is inserted into a cylindrical small diameter portion 1 (plunger tube), an electromagnetic coil 46 through which a plunger 41 is inserted to drive a plunger 41, and an electromagnetic coil 46 are inserted. It is composed of an outer box 45 fitted to the above. The valve body 3 connected to the plunger 41 opens and closes the valve port 13. The external coil guide 44 is arranged on the outer circumference of the small diameter portion 1b. An internal coil guide 43 made of a magnetic material is arranged inside the cylinder of the plunger 41 in the L direction of the axis. The outer box 45 and the plunger 41 are magnetically connected by the outer coil guide 44 and the inner coil guide 43. [Selection diagram] Fig. 1