Thermostatic expansion valve for circuits with cooling, optionally heat pump with thermally controlled safety function

摘要

The thermostatic expansion valve is provided for regulating the high pressure as a transcritical and also subcritically operable circuit (11) with cooling optionally heat pump, with a valve housing (26), on whose inlet operates in the inlet opening (27) of high pressure and at whose output It acts the discharge opening (31) of low pressure, a valve element (33), which valve seat (32) through hole (29) which is arranged between the supply opening (27) and discharge opening (31) for passage of coolant closes and moves in the direction of opening is assigned to the first actuating member (36), the first actuating element (36) comprises a first effective area (37) limited chamber (38) which comprises a control charge (41). The thermostatic expansion valve comprises a high pressure independent thermally activatable actuating element (46), the actuating movement is a movement coupled with the first active surface (37) of the first actuating element (36) when a temperature-dependent actuating movement of the thermally activatable actuating element (46) against the actuating movement of the first active surface (37) of the first actuating element (36), the temperature value of the thermally activatable actuating element (46) for actuating movement is set to the same value as the MOT (maximum operationtemperature) control charge (41) of the first actuating element ( 36) which has a density of filling, which is located after its critical density.