A valve device (1) for a medical system comprises a valve housing (10), an inlet port (102) arranged on the valve housing (10), an outlet port (103) arranged on the valve housing (10), a flow duct (12) extending through the valve housing (10) connecting the inlet port (102) and the outlet port (103) to allow for a fluid flow (P) through the valve housing between the inlet port (102) and the outlet port (103), and a closure element (11) arranged on the valve housing (10) for selectively opening and closing the flow duct (12). Herein, the closure element (11) is displaceable along a displacement direction (A) relative to the valve housing (10) between a closed position in which the flow duct (12) is closed for preventing a fluid flow (P) from the inlet port (102) to the outlet port (103) and an opened position in which the flow duct (12) is opened for allowing a fluid flow (P) from the inlet port (102) to the outlet port (103), wherein the closure element (11) is elastically pretensioned towards the closed position. In this way a valve device is provided which allows for an optimized integration into a medical device such as an infusion line or an infusion pump.L'invention concerne un dispositif de valve (1) pour un système médical, qui comprend un logement de valve (10), un orifice d'entrée (102) disposé sur le logement de valve (10), un orifice de sortie (103) disposé sur le logement de valve (10), un conduit d'écoulement (12) s'étendant à travers le logement de valve (10) reliant l'orifice d'entrée (102) et l'orifice de sortie (103) pour permettre un écoulement de fluide (P) à travers le logement de valve entre l'orifice d'entrée (102) et l'orifice de sortie (103), et un élément de fermeture (11) disposé sur le logement de valve (10) pour ouvrir et fermer sélectivement le conduit d'écoulement (12). Ici, l'élément de fermeture (11) est déplaçable selon une direction de déplacement (A) par rapport au logement de valve (10) entre une position fermée, dans laquelle le
