When removing the packing nut from most gate or globe valves, the valve must be?

To safely remove the packing nut from most gate or globe valves, the valve must be in the fully opened position. This is critical because when the valve is fully open, it minimizes the potential for valve seat wear and reduces the risk of fluid leaking past the valve.

In a closed position, the sealing surfaces are under pressure from the fluid, which can make it difficult or dangerous to loosen the packing nut. If the valve is partially opened, there could still be high pressure on the packing material, leading to potential injury or damage as the packing nut is removed.

By ensuring the valve is fully opened, operators can safely access the packing without the risk of high-pressure fluid escaping, thereby maintaining a safer working environment. This procedure aligns with best practices for valve maintenance and repair, emphasizing safety and functionality.