Fluid Product Dispensing Valve

A fluid dispenser valve for assembling on a fluid reservoir, the valve comprising a valve body (10) containing a metering chamber (20), and a valve member (30) that is slidable in leaktight manner in said valve body (10) between a rest position and an actuated position, said valve containing an inlet passage (40) enabling said metering chamber (20) to be filled with fluid, said valve being characterized in that it includes a closure element (50) that co-operates with said inlet passage (40), said closure element (50) being movable between an open position in which said inlet passage (40) is open, and a closed position in which said inlet passage (40) is closed at least in part, said inlet passage (40) being closed in non-leaktight manner in the closed position of said closure element (50), such that the fluid contained inside the metering chamber (20) can, by gravity, slowly flow out of said metering chamber via said inlet passage (40) that is closed by said closure element (50).