Closing unit associable with a keg type container suitable to contain a beverage, and consisting of two cooperating coaxial containers , wherein one external container has anchoring means, or a threaded portion , said closing unit being suitable to cooperate, also stably, with a beverage dispensing unit, wherein the components of the closing unit are made of recyclable plastic material, possibly also in direct union with the containers , said closing unit having in reciprocal cooperation: - a valve assembly ; - and a closing device , able to be stably anchored to said threaded portion and reciprocally positioning with respect to each other said valve assembly and said two containers, internal and external ; wherein said valve assembly comprises: - a mobile sealing unit comprising a female sealing component cooperating with a male sealing component ; - a valve body (41; 141) provided with a component (38; 39) of the mobile sealing unit ; - a spring device provided with the other component (39; 38) of the mobile sealing unit , wherein said valve body (41; 141) comprises an upper annular portion , an intermediate wall equipped, during use, with a passage aperture , and connected to the upper annular portion by at least one connection element , and a lower extension defining a housing cavity for said spring device , wherein said at least one connection element comprises at least one passage slit or passage channel for a gas, at least one of the following gaskets being present in said valve assembly : a lateral gasket associated with the valve body (41; 141), suitable to act as a seal between the valve body and the internal container and configured to cooperate with a surface of a containing compartment of said internal container , an internal gasket associable, during use, with an internal surface of said internal container and suitable to act as a seal for the mobile sealing unit , an upper gasket , associated with the upper annular portion and associable, during use, with the upper part of said two containers . - a valve assembly ; - and a closing device , able to be stably anchored to said threaded portion and reciprocally positioning with respect to each other said valve assembly and said two containers, internal and external ; wherein said valve assembly comprises: - a mobile sealing unit comprising a female sealing component cooperating with a male sealing component ; - a valve body (41; 141) provided with a component (38; 39) of the mobile sealing unit ; - a spring device provided with the other component (39; 38) of the mobile sealing unit , - a mobile sealing unit comprising a female sealing component cooperating with a male sealing component ; - a valve body (41; 141) provided with a component (38; 39) of the mobile sealing unit ; - a spring device provided with the other component (39; 38) of the mobile sealing unit , wherein said valve body (41; 141) comprises an upper annular portion , an intermediate wall equipped, during use, with a passage aperture , and connected to the upper annular portion by at least one connection element , and a lower extension defining a housing cavity for said spring device , wherein said at least one connection element comprises at least one passage slit or passage channel for a gas, at least one of the following gaskets being present in said valve assembly : a lateral gasket associated with the valve body (41; 141), suitable to act as a seal between the valve body and the internal container and configured to cooperate with a surface of a containing compartment of said internal container , an internal gasket associable, during use, with an internal surface of said internal container and suitable to act as a seal for the mobile sealing unit , an upper gasket , associated with the upper annular portion and associable, during use, with the upper part of said two containers . <EOS>