Injection device comprising a central rod movable in a cleaning position

An injection device for injecting a fluid at an outlet of said device, said device comprising:

• an inlet for receiving the fluid, an outlet for injecting the fluid and a chamber extending between the inlet and the outlet,
• a hollow control rod extending in the chamber and being movable between a sealing position, wherein the control rod closes the outlet, and an injection position, wherein the control rod is arranged away from the outlet, the hollow control rod defining a duct extending through said control rod,
• a central rod extending in the duct of the control rod and movable between a retracted position, wherein the central rod is at least in part retracted inside the duct, and an active position, wherein the central rod protrudes from the control rod and extends through the outlet, the central rod and the duct being arranged to prevent fluidic communication between the duct and the chamber when the central rod moves between its retracted and active positions,
• the central rod and the control rod are further movable relative to each other into a cleaning position, in the cleaning position the duct is in fluidic communication with the chamber such that the fluid flowing in the chamber via the inlet is able to flow inside the duct and around the central rod.