Importance

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Abstract

A valve for use in introducing a foamable reactive mixture into a cavity, with the valve being of such size that it can be positioned within the cavity and when so-positioned is in contact with at least one of the walls of the cavity, with the valve including: a) two essentially rotationally symmetrical coaxial cages, with said coaxial cages being spaced from each other, with the inner cage; i) having an axial opening for the introduction of the reactive mixture and at least two radial openings for the passage of the reactive mixture into the annular space formed between the inner and the outer cage; ii) having a ball, capable of moving freely within said inner cage and capable of closing the inlet opening following completion of the introduction of the reactive mixture; iii) having a convex surface opposite said inlet opening, with said convex surface being directed inward, so that during the introduction of the reactive mixture the ball assumes a position outside the inner cage axis; and b) with said outer cage having at least one radial opening for the passage of the reactive mixture from said annular space to said cavity, with the sizes of said axial opening and said radial openings being such that 1) the total cross-sectional area defined by all of the radial openings in said inner cage is at least twice the cross-sectional area defined by said axial opening; and 2) the total cross-sectional area defined by all of the radial openings in said outer cage is at least twice the total cross-sectional area defined by all of the radial openings in said inner cage.

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First Claim