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Safely mounting glass viewports to elastomer sealed vacuum flanges
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View: Figures


Image of FIG. 1.
FIG. 1.

Illustration of O-ring and groove dimensions. The O-ring groove width is , the O-ring groove height is , and the cross-sectional diameter of the O-ring is .

Image of FIG. 2.
FIG. 2.

Illustrations of the uncompressed and compressed states of an elastomer O-ring. The compression ratio, , for the O-ring is the quotient .

Image of FIG. 3.
FIG. 3.

(Color online) Proper design for an O-ring window seal against a metal flange (Ref. 15). In the figure, vacuum is present above the viewport and atmospheric pressure is below the viewport. Note that the O-rings are on the same diameter and are bearing the full pressure load of the glass.

Image of FIG. 4.
FIG. 4.

(Color online) Minimum thickness of a Pyrex vacuum port window as a function of its unsupported diameter (area inside the O-ring). A safety factor of 4 is included providing a conservative result

Image of FIG. 5.
FIG. 5.

(Color online) (a) Mechanical drawing for adapter flange. Dimensions given are in millimeters. (b) Cross sectional view of O-ring seals on glass window. Dimensions given are in millimeters.


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Scitation: Safely mounting glass viewports to elastomer sealed vacuum flanges