Flow control valve

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 annular;
• 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<2 mm, and D1−D4<2 mm.