This specially developed throttle valve controls the oxygen supply to the respiratory mask of an anesthetic device. In case the control electronics of the device fails, the anesthetist can intervene manually to guarantee the patient’s respiration air supply. The flow is between 0 and 12 l/min depending on the rotation angle of 0° to 270°. A micro switch indicates that the unit is active. Not only has this customer-specific development been realized in a particularly small design. The position monitoring of the regulator via micro switch is an especially innovative solution in this application too.