A thermostat valve for two fluids of different temperatures, preferably cold and hot water, having - a valve core assembly unit for insertion as a whole in an opening of a sanitary fitting housing provided for this purpose, which assembly unit comprises -- one intake opening for each of the fluids -- an outlet opening for the mixed fluid, -- an adjustment device for adjusting the temperature of the mixed fluid and -- a control element , said element having --- a thermostatic temperature sensor and --- a valve body , ---- which valve body is axially displaceable in the valve core for adjusting the inlet openings for the fluids, ---- acts against the force of a return spring and ---- is arranged between valve seats which are provided on the valve core , wherein the valve core assembly unit is provided in two parts such that a first valve seat is formed on a first valve core part, the head piece , and a second valve seat is formed on a second valve core part, the bottom part , wherein the two valve core parts are linearly displaceable relative to each other in such a way that the distance between the valve seats is freely adjustable via a thread by which the first and the second valve core parts are interconnected, and wherein a defined releasable connection is provided between the first and the second valve core parts . - a valve core assembly unit for insertion as a whole in an opening of a sanitary fitting housing provided for this purpose, which assembly unit comprises -- one intake opening for each of the fluids -- an outlet opening for the mixed fluid, -- an adjustment device for adjusting the temperature of the mixed fluid and -- a control element , said element having --- a thermostatic temperature sensor and --- a valve body , ---- which valve body is axially displaceable in the valve core for adjusting the inlet openings for the fluids, ---- acts against the force of a return spring and ---- is arranged between valve seats which are provided on the valve core , wherein the valve core assembly unit is provided in two parts such that a first valve seat is formed on a first valve core part, the head piece , and a second valve seat is formed on a second valve core part, the bottom part , wherein the two valve core parts are linearly displaceable relative to each other in such a way that the distance between the valve seats is freely adjustable via a thread by which the first and the second valve core parts are interconnected, and wherein a defined releasable connection is provided between the first and the second valve core parts . -- one intake opening for each of the fluids -- an outlet opening for the mixed fluid, -- an adjustment device for adjusting the temperature of the mixed fluid and -- a control element , said element having --- a thermostatic temperature sensor and --- a valve body , ---- which valve body is axially displaceable in the valve core for adjusting the inlet openings for the fluids, ---- acts against the force of a return spring and ---- is arranged between valve seats which are provided on the valve core , --- a thermostatic temperature sensor and --- a valve body , ---- which valve body is axially displaceable in the valve core for adjusting the inlet openings for the fluids, ---- acts against the force of a return spring and ---- is arranged between valve seats which are provided on the valve core , ---- which valve body is axially displaceable in the valve core for adjusting the inlet openings for the fluids, ---- acts against the force of a return spring and ---- is arranged between valve seats which are provided on the valve core , <EOS>