Patent ID: 6983923
Filing Date: 2006-01-10
Classification: A61B,F16K

Abstract:
1. A flow control valve, comprising: a housing having a gas inflow port and a gas outflow port which communicates with the gas inflow port through an internal space; a moving member which is arranged inside the housing and is movable toward and away from said gas inflow port; an open/close member arranged on a portion of the moving member opposite to the gas inflow port such that the movement of the moving member opens/closes said gas inflow port; and at least one magnetic coil and a plurality of permanent magnets arranged within the housing to move the moving member, the moving member being made to move with an electromagnetic force generated by said at least one magnet coil and said permanent magnets such that the gas inflow port is opened/closed by the open close member to control an air flow rate; wherein a yoke made of a magnetic substance is placed between at least one pair of the permanent magnets; and said yoke has end surfaces protruding outward from opposing surfaces of said permanent magnets.