A flow control valve, comprising: a valve body component; a valve seat component; and a valve core component; wherein, the valve body component is fixedly connected to the valve seat component, the valve core component is arranged in a valve chamber of the flow control valve, the valve seat component comprises a sealed ring, a first annular protrusion and a second annular protrusion, and the valve core component comprises a valve core, and the valve core comprises a lower section portion substantially in a shape of an annulus; in a case that the valve core abuts against the sealed ring, a lower end portion of the lower section portion is located between the first annular protrusion and the second annular protrusion; the first annular protrusion comprises a first inner wall portion located at an outer side of the lower end portion and configured to be matched with the lower end portion, and the second annular protrusion comprises a first outer wall portion located at an inner side of the lower end portion and configured to be matched with the lower end portion; and in the case that the valve core abuts against the sealed ring, a minimum inner diameter of the first inner wall portion is defined as D1, a maximum outer diameter of the first outer wall portion is defined as D2, a minimum inner diameter of the lower end portion is defined as D3, and a maximum outer diameter of the lower end portion is defined as D4, D3 - D2 < 2mm, and D1 - D4 < 2mm, the flow control valve is characterized in that, the valve core further comprises a body portion substantially in a shape of an annulus, the lower section portion is arranged under the body portion, an outer diameter of the lower section portion is greater than an outer diameter of the body portion, an inner diameter of the lower section portion is greater than an inner diameter of the body portion, and the inner diameter of the lower section portion is less than the outer diameter of the body portion. a valve body component; a valve seat component; and a valve core component; wherein, the valve body component is fixedly connected to the valve seat component, the valve core component is arranged in a valve chamber of the flow control valve, the valve seat component comprises a sealed ring, a first annular protrusion and a second annular protrusion, and the valve core component comprises a valve core, and the valve core comprises a lower section portion substantially in a shape of an annulus; in a case that the valve core abuts against the sealed ring, a lower end portion of the lower section portion is located between the first annular protrusion and the second annular protrusion; the first annular protrusion comprises a first inner wall portion located at an outer side of the lower end portion and configured to be matched with the lower end portion, and the second annular protrusion comprises a first outer wall portion located at an inner side of the lower end portion and configured to be matched with the lower end portion; and in the case that the valve core abuts against the sealed ring, a minimum inner diameter of the first inner wall portion is defined as D1, a maximum outer diameter of the first outer wall portion is defined as D2, a minimum inner diameter of the lower end portion is defined as D3, and a maximum outer diameter of the lower end portion is defined as D4, D3 - D2 < 2mm, and D1 - D4 < 2mm, the flow control valve is characterized in that, the valve core further comprises a body portion substantially in a shape of an annulus, the lower section portion is arranged under the body portion, an outer diameter of the lower section portion is greater than an outer diameter of the body portion, an inner diameter of the lower section portion is greater than an inner diameter of the body portion, and the inner diameter of the lower section portion is less than the outer diameter of the body portion.