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Priority to ES1971168029UpriorityCriticalpatent/ES168029Y/en
Publication of ES168029UpublicationCriticalpatent/ES168029U/en
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Publication of ES168029YpublicationCriticalpatent/ES168029Y/en
Return valve, characterized by comprising a metal body with axial through hole in which there are different diameters and an entrance area with internal thread as well as a conical section that serves as a seat of an inserted frusto-conical seal, in the neck with a head of a sealing piece, inserted in the central hole of the container body, whose body has a step that originates a section of greater diameter that serves as a guide to the plunger piece, inside the duct, and of the base of the seat. End of a coil spring, the other end of which rests on a fold formed on the lower edge of the metal housing, while the said sealing part has a groove that facilitates the passage of air into the balloon at the moment of inflated of it. (Machine-translation by Google Translate, not legally binding)