| abstract |
An actuating attachment for a valve has a carrier (1), a thermal expansion element (3), such as a wax cartridge, an electrical heating element (H) and a control circuit (20) for controlling the heating. The movement of the actuator (5) of the expansion element (3) serves to actuate a valve pin. A position measuring device (11) emits a position signal depending on the position of the actuator (5) or a component that can be adjusted by it. The control circuit (20) controls the heating as a function of the control voltage and position signal. In this way, larger tolerance differences in the expansion elements (3) are compensated. <IMAGE> |