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The ornamental design for a check valve, as shown and described. |
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FIG. 1 is a side perspective view of a swing check valve showing my new design;
FIG. 2 is a perspective view taken from the side opposite that shown in FIG. 1;
FIG. 3 is a perspective view taken from the side opposite that shown in FIG. 1 showing the valve in an open position;
FIG. 4 is a perspective view taken from the opposite side of FIG. 3;
FIG. 5 is an exploded perspective view taken from the side shown in FIG. 1; and
FIG. 6 is an exploded perspective view taken from the side shown in FIG. 2.
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