Air cuts off valve

The utility model discloses an air cuts off valve adopts the whole oval -shaped valve clack main part that is, its minor axis with the internal diameter of valve body cooperatees, and its major axis is greater than the internal diameter of valve body uses this valve clack main part right when the valve body sealed, the valve clack main part can realize that the stiff dough of valve body is sealed when rotating in the inside rotation of valve body when laminate with the valve body inner wall in the summit that is located major axis direction both ends, and at this moment the valve body terminal surface for the axis slope of valve clack main part sets up to can not deflect closed position to the valve clack main part and the air cuts off valve that results in closes the not tight circumstances and appears when having guaranteed also that the valve is closed when having solved the not enough problem of air cuts off valve gas tightness. 本实用新型公开种空气切断阀门，采用整体呈椭圆形的阀瓣主体，其短轴与所述阀体的内径相配合，其长轴大于所述阀体的内径，使用该阀瓣主体对所述阀体进行密封时，阀瓣