Valved connector closed loop liquid dispensing system

Closed loop dispensing system comprising a mechanical valve device, configured to be inserted into a receiver integrally coupled to a container in correspondence with an access aperture thereof, and a dispenser cap configured to be coupled to the receiver, wherein the mechanical valve device has a longitudinal axis and comprises

• a cup-shaped base configured to be inserted into the receiver and closed by a bottom having an inlet aperture configured to be inserted into the container, when the mechanical valve device is inserted into the receiver, the cup-shaped base being provided with one or more longitudinal tunnels which house respective one or more at least partial occlusion elements,
• a spring support, that is coupled to the cup-shaped base and that is spaced apart from the bottom of the cup-shaped base, wherein the spring support is provided with a spring support top sleeve, the spring support being configured to put the inlet aperture in fluid communication with an outer surface of the spring support top sleeve,
• a movable sealing dome slidingly coupled to the spring support top sleeve ensuring a seal between the movable sealing dome and the spring support top sleeve, whereby the spring support top sleeve and the movable sealing dome define a variable volume sealed chamber that houses an elastic element supported by the cup-shaped base, wherein the elastic element assumes an elongated configuration when said chamber assumes an enlarged configuration having a first volume and a compressed configuration when said chamber assumes a reduced configuration having a second volume lower than the first volume, and
• a locking cover resting on the cup-shaped base and having a locking cover top sleeve surrounding a hole, wherein an edge of the hole and the movable sealing dome are configured to be in contact with each other by sealed interference fit when the elastic element assumes the elongated configuration, and wherein the dispenser cap, having an outlet aperture and one or more vent apertures, comprises an unlocking member having a bottom cylinder and a bottom central duct that is arranged inside the bottom cylinder and is in fluid communication with the outlet aperture, wherein, when the mechanical valve device is inserted into the receiver and the dispenser cap is decoupled from the receiver, said chamber assumes the enlarged configuration and the inlet aperture is in fluid communication with die cup-shaped base up to a bottom surface of the locking cover with the hole closed by the interference seal betw een the edge of the hole and the movable sealing dome, and wherein, when the mechanical valve device is inserted into the receiver and the dispenser cap is coupled to the receiver, the bottom cylinder is coupled by interference fit to the locking cover top sleeve and the bottom central duct interacts with the movable sealing dome causing said chamber to assume the reduced configuration, whereby the inlet aperture is in fluid communication with the outlet aperture, and said one or more at least partial occlusion elements are configured to cause the container to be in fluid communication with said one or more vent apertures.