Valve packing is installed around which part of a valve?

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Multiple Choice

Valve packing is installed around which part of a valve?

Explanation:
Packing seals around the moving stem as it passes through the bonnet. The stem is the part that slides to open or close the valve, so a packing material placed in the stuffing box around the stem is compressed by a gland to prevent fluid from leaking along the stem interface. The flange is just the connection to the piping, the bonnet is the housing that contains the stem and packing, and the seat is the internal sealing surface in the flow path—none of these require packing in the same way around the stem.

Packing seals around the moving stem as it passes through the bonnet. The stem is the part that slides to open or close the valve, so a packing material placed in the stuffing box around the stem is compressed by a gland to prevent fluid from leaking along the stem interface. The flange is just the connection to the piping, the bonnet is the housing that contains the stem and packing, and the seat is the internal sealing surface in the flow path—none of these require packing in the same way around the stem.

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