Closing device, valve unit and container

1. Closing device for a container for fluids, comprising:

a valve unit comprising:

a support element provided with a passage aperture for the fluid entering into and exiting from said container and

a body, provided with shutter means disposed to engage with said passage aperture, and mobile with respect to said passage aperture to alternatively define at least a closed configuration and an open configuration of said valve unit, wherein said shutter means and said passage aperture have an at least partly complementary shape, said body also comprising elastic means that are integrated in a single body with said shutter means to elastically deform said body between an extended position, in which said shutter means close said passage aperture in an at least partly complementary manner and form a seal, and a compressed position, in which said shutter means are distanced from said passage aperture; and

a lid disposed to close an opening of said container, and comprising holding means disposed to engage with attachment means of said support element, so as to allow the connection between said valve unit and said lid,

wherein said body comprises connection means configured to attach said body to said support element so that said support element moves away from the lid when said elastic means are in the compressed position.

2. Closing device as in claim 1 , wherein said lid defines a cavity facing from an opposite part with respect to said opening that is configured to receive a portion of a fluid delivery device; said lid comprising a cap that closes said cavity to protect it from dirt and impurities.

3. Closing device as in claim 1 , wherein said lid comprises a threaded portion that engages with a respective threaded portion made on the outside of said container so that said lid can be screwed on said container.

4. Closing device as in claim 1 , wherein said holding means are configured as an annular hollow and said attachment means are configured as an annular protrusion that can be inserted under pressure inside said annular hollow.

5. Container for fluids comprising an external keg and an internal bag disposed internally to the external keg and suitable to contain a fluid; said container comprising said closing device as in claim 1 .

6. Container as in claim 5 , wherein said container and said closing device are made of plastic material as polyethylene terephthalate (PET).

7. Valve unit associable with a closing device of a container for fluids, comprising:

a support element that is disposed to be attached to a closing device of a container for fluids and that comprises at least a passage aperture through which the fluid can enter into or exit from said container, and

a body comprising shutter means disposed to engage with said passage aperture to selectively close said passage aperture, wherein said shutter means and said passage aperture have an at least partly complementary shape, said body being mobile with respect to said passage aperture so as to define at least a closed configuration of said valve unit, wherein said shutter means engage with said passage aperture in an at least partly complementary manner and form a seal to prevent the passage of the fluid through it, and an open configuration of said valve unit in which said shutter means are distanced from said passage aperture to allow the passage of the fluid through it, wherein said body comprises elastic means that are integrated in a single body with said shutter means to elastically deform said body between an extended position, in which said valve unit is in said closed configuration, and a compressed position, in which said valve unit is in said open position,

wherein said body comprises connection means configured to attach said body to said support element so that said support element moves away from the lid when said elastic means are in the compressed position.

8. Valve unit as in claim 7 , wherein said connection means are integrated in a single body together with said shutter means and said elastic means.

9. Valve unit as in claim 7 , wherein said support element comprises a sealing portion that is disposed to engage in a sealed manner with an upper edge of said container.

10. Valve unit as in claim 7 , wherein said support element comprises attachment means that allow to attach said support element to said closing device.

11. Valve unit as in claim 7 , wherein said support element and said body are made of a plastic material as polyethylene terephthalate (PET).