Expansion valve with valve port being replaceable

The invention discloses an expansion valve with a valve port being replaceable. The expansion valve with the valve port being replaceable comprises a valve seat, a valve needle and a connection pipe.The valve port is formed in the end face of the connection pipe, and a sealing ring groove is formed in the cylindrical face of the outer side of the valve port. A sealing ring is placed in the sealing ring groove to seal and fasten a gap between the valve port and the valve seat through a thread, and a nut brass solder is assembled on the connection pipe to be formed into a whole with the valve seat. The interior of the connection pipe, the interior of the valve seat and a valve port hole form a channel, and the connection pipe, the valve seat and the nut brass solder are connected together.The sealing ring adopts an O-shaped sealing ring, and the upper plane of the valve port is directly attached to the matching face of the valve seat. According to the technical scheme of the expansionvalve, the valve port can b