Patent ID: 8915480

Claim:
Valve actuator system, comprising: a valve that has a valve housing at least one inlet, at least one outlet, a valve regulating element for controlling flow through the valve and that is mechanical connected to a valve actuator having at least one piston that is movable in a housing by a pressurized liquid medium in at least one direction and that is connected to the valve regulation element, the housing of the valve actuator comprising a first cavity chamber and a second cavity chamber which are separated by said at least one movable piston, which first and second chambers are connected through connecting lines and a valve arrangement to a pressure line and to a return line, the pressure line being connected to a pump, the return line being connected to a tank, and the pressurized liquid medium being a primarily incompressible medium comprised primarily of water, wherein the valve arrangement has a magnetic coil and a slider that is movable by the magnetic coil, wherein the at least one piston is lockable in the housing by blocking connection of the connecting lines to the pressure line and the return line by movement of the slider of the valve arrangement by said magnetic coil, whereby the piston and the valve regulating element are locked in a given position that prevents pressure fluctuations in a drug or food in said flow from moving the valve regulation element and the piston in any direction as a result of the pressurized liquid in the blocked connecting lines being essentially incompressible, and wherein the valve is a hygienic sanitary valve connected in a flow of fluid food or drug for regulating of said flow, at least surfaces of the valve in contact with the food or drug being formed of a hygienic material, which material prevents growth of bacteria or fungus.