Heat engine

A heat engine having a working medium cycle, said heat engine comprising:

• an evaporator configured for evaporating a working medium formed as a liquid;
• an expander configured for expanding an evaporated said working medium;
• a condenser configured for liquefying an expanded said working medium from said expander;
• a working medium pump configured for supplying a liquid said working medium to said evaporator;
• and
• a valve configured for controlling an amount of working medium conveyed from said working medium pump to said evaporator, said valve including a valve seat, a valve body, a sensor connected via one of a gas pressure line and another pressure-conducting connection, and a control member one of on said valve body and additionally to said valve body, said valve body configured for regulating a flow rate of said working medium through said valve according to a position of said valve body relative to said valve seat, said control member configured for influencing said position of said valve body according to a control pressure conveyed via said sensor and dependent on a state variable of one of said working medium and another medium.