Abstract: A valve device includes a valve seat component; the material of the valve seat component contains a metal; the valve seat component is machined and formed by means of a drawing process; the valve seat component comprises a connecting part and a valve seat part; the connecting part and the valve seat part are of an integrated structure. By means of such configuration, compared with the manner in which the connecting part and the valve seat part are respectively cut, machined and formed by machining by using metal material blocks, machining consumables and machining energy consumption of the valve seat component can be reduced.

Abstract: An electric valve, comprising a nut assembly and a sleeve. The nut assembly comprises a plastic member and a connection portion; the sleeve comprises an opening portion; the connection portion comprises an upper end face portion; the opening portion is fixedly welded to the upper end face portion; and at least part of the upper end face portion is arranged at the outer side of the opening portion in a radial direction of the electric valve.

Abstract: An electric valve includes a nut assembly, a valve seat assembly, and a sleeve. The nut assembly includes a plastic part and a connecting portion fixed to each other; the connecting portion is made of metallic material; the sleeve is fixed to the connecting portion; the connecting portion includes a lower end face portion; the valve seat assembly includes a first end portion; the first end portion is made of metallic material; the first end portion is fixed to the lower end face portion by welding. The valve seat assembly cooperates with the connecting portion without machining an additional cooperating structure, thereby reducing the machining costs of the electric valve.