Patent ID: 6968742

Claim:
A control box for transformation of a control signal into a mechanical movement and for conveying said mechanical movement to a component to be controlled, said control box comprising a first pressure chamber ( 4 ), a second pressure chamber ( 6 ), a membrane ( 12 ) that separates said two pressure chambers from each other in a gas tight manner, a spring that pre-tensions said membrane in a first direction and a control rod which may be caused by said membrane ( 12 ) to execute control movements, at least one of said two pressure chambers ( 4 , 6 ) being susceptible to be subjected to a change of pressure, thereby causing a control movement of said control rod, wherein said first pressure chamber ( 4 ) and said second pressure chamber ( 6 ) are connectable to one or several negative pressure sources via pressure ducts ( 10 c , 22 c ), and wherein spring ( 3 c ) is located in the second pressure chamber.