Regarding the replacement of the gate valve stem packing and the replacement of the valve cover gasket
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With maintenance approaching, and in order to save costs, we plan to replace and repair some packing elements as well as valves at the leakage points on the large covers within the plant area. However, we lack expertise in this area, so we are seeking guidance from those who are more experienced. I’m urgently seeking replies regarding the selection or models of valve gaskets and large cover gaskets for different pipe diameters, as well as the precautions to take when replacing them!
It’s not clear whether there are any time requirements for this type of maintenance. There are also requirements for maintenance quality. Strictly speaking, shutdown for maintenance refers to maintenance carried out during seasonal market periods, and it is a type of maintenance that lasts for a short time with the aim of resuming operations as soon as possible. Therefore, it is best to request a valve replacement. This is because the valves that require maintenance need to have their valve seats ground, their packing replaced, and undergo pressure testing before they can be put into use. If you plan things this way now, it will only possibly solve the problem of leakage caused by the replacement of the packing; it’s difficult to ensure no leakage from the valve cover, as in most cases the sealing at the valve cover flange is done using flexible graphite gaskets. It breaks easily. Hope to be cautious.
If it needs to be replaced, the valve cover flange gasket will definitely be replaced as well; after that, pressure testing is carried out. If the result is satisfactory, it can be installed; otherwise, it certainly cannot be installed{:1_90:}