US Patent 7370614 Electromagnetically driven valve

An electromagnetically driven valve includes a driven valve having a stem and carrying out reciprocating motion along a direction in which the stem extends, a disc support base having an abutment surface, a disc extending from one end coupled to the stem toward the other end supported by the disc support base so as to allow free oscillation of the disc, and an electromagnet applying electromagnetic force to the disc. The disc has a root portion formed at the other end, and an arm portion formed from the root portion to one end. The electromagnet has a surface facing the arm portion. When the disc is attracted to the electromagnet the abutment surface abuts on the root portion and a gap is created between the surface and the arm portion. With such a structure, excellent quietness and durability can be achieved and energy loss can be reduced.