Patent ID: 6758055
Filing Date: 2004-07-06
Classification: F25B

Abstract:
An expansion valve comprising:a valve body including a high-pressure-side path, a low-pressure-side path and an orifice communicating said two paths; a valve member disposed so as to oppose to said orifice; and a diaphragm for moving said valve member via an actuating rod; wherein said valve body receives an aluminum anodization treatment, and said orifice is equipped with an orifice member affixed therein, said orifice member being harder than the valve body and having a flat contact surface that comes into planar contact with said valve body, said orifice member is a substantially cylindrical member and includes one open end constituting the flat contact surface that comes into planar contact with the valve body, another open end including a flange portion extending radially from the cylindrical member and defining a frustoconically-shaped valve opening and constituting a surface to which is opposed said valve member, and a screw portion formed to an outer side portion of said orifice member by which said orifice member is fixed to said valve body and an adhesive is applied to said screw portion with said flange portion being disposed apart from the orifice in a non-contacting relationship with said valve body when the orifice member is fixed in the orifice to said valve body.