Emergency-operation valve block for a mobile crane

A mobile crane comprising:

• an emergency drive;
• at least two crane drive mechanisms assigned to a crane superstructure;
• and
• an emergency-operation valve block comprising:
• a drive port for hydraulically connecting the valve block to the emergency drive;
• at least two drive mechanism ports for hydraulically connecting the valve block to respective crane drive mechanisms of the at least two crane drive mechanisms;
• at least two closing valves, which are respectively assigned to one of the drive mechanism ports of the at least two drive mechanism ports and designed to selectively open or close a hydraulic connection between the drive port and the respectively assigned drive mechanism port;
• an actuation valve which is designed to selectively reverse the hydraulic connection between a pressure side and return side of the drive port and corresponding sides of the drive mechanism ports;
• and
• wherein the closing valves are designed to be actuated by a hand lever wherein actuating the closing valves is designed such that simultaneously opening multiple closing valves is prevented.