Valve system

A valve system comprising:

• a first valve;
• and
• a second valve,
• wherein the first and second valves each comprise:
• a housing with a plurality of housing openings to provide a fluid connection with an external flow channel for a fluid;
• and
• a valve body that is arranged rotatably in the housing and has at least one connection channel for providing a fluid connection between at least two of the housing openings of the housing, wherein between the housing and the valve body, a seal having seal openings corresponding to the housing openings in the housing is arranged for sealing the fluid connections from an open environment,
• wherein the valve body of the first valve and the valve body of the second valve are mechanically coupled with each other by a coupling device of the valve system, and
• wherein the coupling device is designed such that the valve bodies are adapted to be rotated jointly by the coupling device when the valve system is in a first operating state and are each adapted to be rotated independently by the coupling device when the valve system is in a second operating state.