Fig Plug cock assembly

This example illustrates a typical industrial valve. The plug turns through 90° between the on and off positions. Spanner flats are provided and indicated by the diagonal lines. Gland packing (Part 10) is supplied in rings. These rings are contained by the body cover and on assembly are fed over the plug spindle. The gland is tightened and the compressive force squeezes the packing to provide a seal, sufficient to prevent leaks, but enabling the spindle to be turned. The joint ring (Part 9) is too thin to be cross hatched and is shown filled in.

This is also an example of a symmetrical part where the half section gives an outside view and a sectional view to indicate the internal details.

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