the gas liquid two phase refrigerant flows into the port 2 this enables the expansion valve of the fifth embodiment to reduce the noise produced when the refrigerant passes through the orifice 55 additionally since the refrigerant passage noise becomes continuous non continuous noise such as that in the expansion valve of the prior art is reduced 1 although the expansion valves in the first to fifth embodiments each have single orifices 5 35 and 55 two or more orifices may be provided as long as turbulent portions 6 26 43 is provided upstream of the orifice 5 35 55 such modification will not cancel the effect of the turbulent portions 6 26 and 43 described above 2 in the third embodiment the turbulent portion 6 of the first embodiment is provided both upstream and downstream of the valve seat 11 in the same manner the turbulent portion 26 in the second embodiment may be provided both upstream and downstream of the valve seat 11 3 the gap 15 in the first and second embodiments not only functions to enlarge the cross sectional area of the passage formed between the orifice 5 and the turbulent portions 6 and 26 but also functions to change the cross sectional area of the refrigerant passage the expansion device may be configured such that the gap has only the latter function this would also cause.