The root valve (manual valve) of the separator does not close properly – how can it be replaced under pressure?
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If the root valve (manual valve) of the separator does not close properly, it is generally necessary to relieve pressure in the separator before replacing the root valve. Is there any technique that allows operation of the separator without pressure leakage, or can a component similar to a blind flange be installed between the outlet of the separator and the root valve prior to commissioning?
The bypass is first opened using the pressure-containing opening method； There is a blockage before and after the valve; replace the valve, and after replacement, remove the blockage and the bypass.
Weren’t the root valves ahead not sealing properly? Ignore it. Try to turn the root valve down to the minimum, then find a pipe segment of the same size along with a valve, and weld them in series behind the root valve. Keep the new valve fully open during welding, and close it after welding is complete.
It is unlikely to replace the root valve online under pressure; a shut-off valve can be installed at the outlet of the root valve instead. If the system is shut down, the replacement can be carried out at an appropriate time.