Flow modulator for a fluid

A flow modulator for a fluid, comprising:

• a modulator body having a channel providing a flow passage for the fluid;
• a valve body having an opening providing another flow passage for the fluid,
• wherein the valve body has a guide pin being positioned in an axis of rotation of the valve body;
• an actuator by which the valve body is rotatably displaceable relative to the modulator body to modulate the fluid flow by changing an overlap between the opening or a flow channel of the valve body and the channel or the flow passage of the modulator body;
• a gear transmission,
• wherein an input side of the gear transmission is in operative connection with the actuator having a fixed axis of rotation, and
• wherein an output side of the gear transmission is in operative connection with the valve body having a translationally displaceable axis of rotation,
• wherein the modulator body has a guide groove for the guide pin of the valve body, the guide groove is configured to:
• allow a rotational displacement of the valve body relative to the modulator body,
• allow a translational displacement of the valve body relative to the modulator body in a distance direction (X) of the axis of rotation of the actuator and the axis of rotation of the valve body, and
• prevent the translational displacement of the valve body relative to the modulator body diagonal and/or orthogonal to said distance direction of the axis of rotation of the actuator and the axis of rotation of the valve body.