A thermostatic valve to connect a heat source, in particular a gear drive, with a heat exchanger, particularly a motor vehicle. The thermostatic valve having a thermostatic valve housing with a first inlet connection for a first inlet port and a second inlet connection for a second inlet port, as well as a first outlet connection for a first outlet port and a second outlet connection for a second outlet port. The thermostatic valve further including a moveable working element in an intake opening of the thermostatic valve housing to open and close the inlet and outlet ports and a separate restriction element provided in the thermostatic valve housing between the first inlet connection and the first outlet connection.