The invention provides an electro valve of which the valve core comprises: a
basal body which is fixed with a taper valve part, a major
diameter shaft part, a minor
diameter shaft part and a
flange part located on a
valve seat in turns from the lower; and a collar hanger component whcih is lagged on the minor
diameter shaft part of the
basal body in a relative move and rotation state in an axial direction, and stopped by a tubby stop part fixed on a valve support to support the lower end of a
helical compression spring. When the valve support is located in a lowest position, the undersurface of the collar hanger component is press bonded on a step surface at upper of the major diameter shaft part of the
basal body, while a defined gap is formed beteen the undersuface of the collar hanger component and the upper surface of the stop part. When the rotor and the valve support rotates a defined amount from the lowest position, the upper surface of the tubby stop part abuts on the undersurface of the collar hanger component, and the collar hanger component aparts from the upper step surface of the major diameter shaft part; and when the rotor and the valve support further rotates, the collar hanger component pushes the
flange part up. The invention can redece the
frictional resistance of the structural member, reduce the drive torque needed for opening the valve, obtain a simple structure with a fewer components, and reduce the cost of the device.