Regarding the gate valves on the flue gas pipeline
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During the renovation of the smoke pipe (with a temperature of 350 degrees, pressure of 5 kPa, and DN 1000 mm), an additional automatically controlled butterfly valve was installed. The owner suggested that, to prevent the butterfly valve from failing to close, manual closing mechanisms should be considered; for example, an 8-shaped blind flange could be used. I would like to ask whether it is possible to add a gate valve, as this would allow for quick closure. Are there any other measures available? I appreciate your advice.
Just set up two valves, one in use and one as a backup. Simplicity is best; complexity makes things difficult to handle.
Plug valves work as well, but they sometimes have more internal leakage