In the process of packing a gate valve, what should be done with the valve after polishing the stem?

After polishing the stem of a gate valve, applying a few drops of oil to the stem is important for ensuring smooth operation and preventing wear. Polishing the stem reduces surface irregularities and helps to achieve a better seal against the packing, but without lubrication, the stem may experience increased friction when operated, leading to possible damage or difficulty in functioning.

Lubrication helps to promote a smooth movement of the stem within the packing material, reducing potential damage caused by friction and wear over time. This lowers the risk of the valve being difficult to operate and extends the lifespan of the valve.

Other options involve steps or actions that do not contribute to maintaining the valve's efficiency after polishing. For instance, immediately closing the valve without lubrication could lead to unnecessary friction. Tightening the gland without applying oil would not address lubrication needs, potentially leading to problems. Opening the valve to check for leaks typically comes after installation or maintenance, not immediately following polishing, and should be done with proper precautions to ensure safety and functionality.