Forming method of hollow sodium-filled valve for extrusion blank forming

The invention discloses a forming method of a hollow sodium-filled valve for extrusion blank forming. The method comprises the steps that according to the dimension of a valve product, a wall thickness pipe is selected as an initial blank; the wall thickness pipe is heated and extruded, so that one end of the wall thickness pipe is made to form a hollow valve rod part; then through a rotary forging forming technique, the other end of the wall thickness pipe is made to form a disc part of the valve; the disc part of the valve is machined and sealed; the interior of the valve is machined, cleaned, dried and filled with sodium; then the valve rod part is machined and sealed; and finally the hollow sodium-filled valve is obtained. The forming technique is easy and convenient to operate, by the adoption of the technique, the utilization rate of materials can be effectively increased, the production cost is reduced, the production efficiency is improved, the volume of an inner cavity of the produced valve is larger