Abstract: An actuator with an electrically heatable operating element, the housing of the operating element being held stationary in a mount of a base body, and a transfer element, which comprises two plastic molded parts, is provided between the piston and the element to be adjusted.

Abstract: A thermostatic valve includes a valve housing and a preassembled construction unit insertable into the valve housing to form a complete assembly. The valve housing is stepped with a widest section closest to an insertion opening. The preassembled construction unit includes a thermostatic working element with restoring spring and movable valve elements.

Abstract: For a thermostatic valve in the coolant circulation system of an internal-combustion engine having an expansion material element penetrating the main valve for the cold-side stationary support and the hot-side driving connection with the valve disk of the main valve, it is provided for increasing the response characteristic of the thermostatic valve to act upon the expansion material element in the cold-side end section in addition by a hot coolant and/or to provide a metal film resistor as an electric heating device placed in the expansion material.

Abstract: A cooling system for an internal-combustion engine which is cooled by means of a liquid coolant and is arranged in a circulating system having a coolant radiator, to which circulating system at least one heat exchanger of an accessory device is connected by means of a switching valve. As a switching element for switching the valve element, a thermostatic working element is used which is loaded by means of a restoring spring, is acted upon by the coolant and is provided with an electric heater. The thermostatic working element contains an expansion material which is designed to a switching temperature which is higher than a maximal operating temperature of the coolant flowing to the thermostatic working element.