Fail-safe actuation system

A fluid-based actuation system having a safety position comprising:

• an actuator having a first chamber and a second chamber;
• a working circuit having a motor/pump device and configured and arranged to, in an operative state, actuate the actuator;
• a safety circuit configured and arranged to, in a failure state, move the actuator into the safety position;
• the safety circuit having a tank that holds pressurized fluid and, in the failure state, is configured and arranged to automatically connect to the first chamber via a switching valve;
• the safety circuit having a drain valve that has a through-flow position and, in the failure state, is configured and arranged to drain fluid out of the second chamber;
• the safety circuit configured and arranged such that, in the operative state, the working circuit with its motor/pump device provides an inflow into the actuator, in a manner that is decoupled from the tank;
• the safety circuit configured and arranged to provide, in the failure state, an inflow from the tank into the first chamber, in a manner that is completely decoupled from the working circuit with its motor/pump device;
• a short-circuit fluid connection between the first and second chambers;
• the short-circuit fluid connection configured and arranged to provide, in the failure state, a through-connection between the first and second chambers;
• and
• wherein a short-circuit flow is provided between the first and second chambers in the failure state.