In a stuffing box, the packing is pressed against the stem by a?

In a stuffing box, the packing is indeed pressed against the stem by a follower. The follower is designed to apply consistent pressure on the packing material around the stem of the valve or other equipment, creating a seal that prevents fluid leakage. By doing this, the follower ensures that the packing remains compressed, thereby maintaining its sealing effectiveness over time.

The proper functioning of the follower is crucial because it adapts to any wear in the packing by allowing for adjustments to maintain a secure seal. This aspect is key in preventing leaks, which can lead to operational issues and safety hazards.

While other options may play roles in different applications or contexts, the specific function of pressing the packing against the stem to create a seal is primarily fulfilled by the follower within a stuffing box assembly.