Expansion valve

An expansion valve for refrigerating cycle comprising:

• a valve casing containing a high-pressure refrigerant duct and a separate low-pressure refrigerant duct;
• a valve seat bore formed within the high-pressure refrigerant duct;
• a valve body associated with the valve seat bore, wherein the valve body moves between a blocking position seated on the valve seat bore and an opening position lifted away from the valve seat bore;
• a rod aligned at one end with the valve body, wherein the rod is retractably guided in the direction of a center axis of the rod within a penetrating bore of the valve casing, wherein the rod includes a free end facing the power element, wherein the free end of the rod defines a first abutment surface and prolongs a straight rod portion received within the penetrating bore;
• a power element stationarily provided within the valve casing in flow and pressure connection with the low-pressure refrigerant duct, wherein the power element axially displaces the rod by a force corresponding with the temperature and/or the pressure of refrigerant passing through the low-pressure refrigerant duct;
• wherein the power element includes a pressure responsive diaphragm and a diaphragm receiver movable within a housing of the power element in response to pressure-related diaphragm motions, wherein a lower surface of the diaphragm defines a second abutment surface;
• wherein first and second abutment surfaces mutually contact each other at a common contact point;
• and
• wherein one of the first and second abutment surfaces is rounded and the other of the first and second abutment surfaces is obliquely inclined in relation to the center axis of the rod.