A valve for controlling a flow of a fluid, having - a valve housing with ∘ an outer wall defining at least a first port and a second port for a fluid, and ∘ a fluid channel connecting the first port to the second port and having a passage section being located between the first port and the second port , - a valve member inside the valve housing , the valve member being arranged in the fluid channel and having at least a blocking position and an unblocking position wherein the valve member , ∘ in the blocking position, closes the passage section preventing the fluid from flowing through the passage section and, ∘ in the unblocking position, opens the passage section at least partially enabling the fluid to flow through the passage section , - actuation means being mechanically coupled to the valve member for controlling a movement of the valve member , wherein the valve has at least one radiating element having a radiating surface and being arranged and configured to irradiate a surface portion of the passage section and/or a surface portion of the valve member with an electromagnetic radiation for inhibiting a spreading of germs thereon, and wherein at least one electromagnetic wave guide is connected to the at least one radiating element for guiding the electromagnetic radiation thereto, the at least one electromagnetic wave guide comprising an optical fiber or a liquid light guide, characterized in that the at least one radiating element is attached to or integral with a surface portion of the valve member wherein the at least one electromagnetic wave guide extends through a valve rod for mechanically coupling the actuation means with the valve member , the valve rod being a hollow rod. - a valve housing with ∘ an outer wall defining at least a first port and a second port for a fluid, and ∘ a fluid channel connecting the first port to the second port and having a passage section being located between the first port and the second port , ∘ an outer wall defining at least a first port and a second port for a fluid, and ∘ a fluid channel connecting the first port to the second port and having a passage section being located between the first port and the second port , - a valve member inside the valve housing , the valve member being arranged in the fluid channel and having at least a blocking position and an unblocking position wherein the valve member , ∘ in the blocking position, closes the passage section preventing the fluid from flowing through the passage section and, ∘ in the unblocking position, opens the passage section at least partially enabling the fluid to flow through the passage section , ∘ in the blocking position, closes the passage section preventing the fluid from flowing through the passage section and, ∘ in the unblocking position, opens the passage section at least partially enabling the fluid to flow through the passage section , - actuation means being mechanically coupled to the valve member for controlling a movement of the valve member , wherein the valve has at least one radiating element having a radiating surface and being arranged and configured to irradiate a surface portion of the passage section and/or a surface portion of the valve member with an electromagnetic radiation for inhibiting a spreading of germs thereon, and wherein at least one electromagnetic wave guide is connected to the at least one radiating element for guiding the electromagnetic radiation thereto, the at least one electromagnetic wave guide comprising an optical fiber or a liquid light guide, characterized in that the at least one radiating element is attached to or integral with a surface portion of the valve member wherein the at least one electromagnetic wave guide extends through a valve rod for mechanically coupling the actuation means with the valve member , the valve rod being a hollow rod. <EOS>