Patent ID: 8806880

Claim:
An expansion valve for transmitting a displacement of a diaphragm constituting a valve member driver provided in a valve body via a valve member drive rod to a valve member, to thereby move the valve member close to or away from a valve seat in order to control a flow rate of a refrigerant; wherein the valve body is composed of a body upper portion, and a body lower portion having a narrower width than the body upper portion, and bolt fitting grooves opened to an outer side of the valve body are formed at a boundary between the body upper portion and the body lower portion. the bolt fitting grooves are formed simultaneously during extrusion processing of the valve body, the bolt fitting grooves have cylindrical arc-shaped cross-sections, and the openings of the grooves are opened toward an obliquely downward direction at the boundary, and the opening width of the bolt fitting grooves is narrower than a bolt diameter of a mounting bolt inserted into the bolt fitting grooves.