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 . <EOS>