Movable valve core and electromagnetic valve comprising the same

A movable valve core, comprising a cylindrical core body (1) defining a central axis, a leading head (2) fixed to the core body (1) removably, and a water-proof valve membrane (3) sandwiched between the core body (1) and the leading head (2), wherein a mounting hole (4) is axially formed in the core body (1), and a connector (5) for projecting into the mounting hole (4) extends axially from the bottom of the leading head (2), and the connector (5) is fixed into the mounting hole (4);

• wherein the connector (5) is provided with a flexible notch (12) open axially and radially, thereby dividing the connector (5) into a plurality of flexible petals (11), and
• wherein the connector (5) comprises a first shaft section (7) formed axially and integrally with the leading head (2) and connected with the bottom of the leading head (2), a second shaft section (8) formed axially and integrally with the first shaft section (7) and a third shaft section (9) formed axially and integrally with the second shaft section (8), and wherein the flexible notch (12) is formed in the third shaft section (9), and the diameters of the third shaft section (9), the second shaft section (8) and the first shaft section (7) are reduced in sequence.