FIELD: sealing facilities; making and fitting gaskets in valve unit. SUBSTANCE: improved unit of valve has a seal made in the form of folded joint coupling. Joint of gasket materials is arranged at distance from section of housing of valve unit. Invention provides description of gasket material making method by forming bending line or joint by bending and placing one segment of material onto the other. Bending line is formed by press tool. EFFECT: provision of reliable sealing between valve unit and container edge. 23 cl, 18 dwg
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