When repacking a gate valve, what steps should be taken regarding the old packing?

Removing all the old packing from the stuffing box is essential for ensuring a proper seal and preventing leaks when repacking a gate valve. Over time, packing materials can degrade, compress, or become contaminated, which can affect their effectiveness in sealing the valve stem. If any old packing is left in place, it may lead to improper compression of the new packing, increasing the risk of leakage and potentially causing operational issues.

Additionally, a clean stuffing box allows for better installation of the new packing. It ensures that any worn or damaged materials do not compromise the integrity of the new packing, leading to a more reliable and efficient valve operation. Comprehensive removal of the old packing, cleaning the stuffing box, and then installing the new packing not only enhances the performance of the valve but also prolongs its lifespan.