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:
Valve packing creates a dynamic seal around the stem where it passes through the bonnet/stuffing box. As the stem moves to open or close the valve, packing material is compressed by a gland to fill the gap between the stem and the bonnet, preventing fluid from leaking along the stem. The stem is the part that penetrates the valve body and requires this seal; the flange is just the joint between pipes, the seat is the stationary sealing surface for the disc or plug, and they aren’t where packing is placed. So packing is installed around the stem.

Valve packing creates a dynamic seal around the stem where it passes through the bonnet/stuffing box. As the stem moves to open or close the valve, packing material is compressed by a gland to fill the gap between the stem and the bonnet, preventing fluid from leaking along the stem. The stem is the part that penetrates the valve body and requires this seal; the flange is just the joint between pipes, the seat is the stationary sealing surface for the disc or plug, and they aren’t where packing is placed. So packing is installed around the stem.

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