The catalytic large and small butterfly valves are used to control the pressure in the regenerator; the small butterfly valve is fully open while the large butterfly valve is left at a slight opening. Why is that?
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Is there such a device to control the regeneration pressure?
To prevent the valve disc from getting stuck when the switch is activated, this is less of an issue for smaller butterfly valves
What was said upstairs is correct – it’s to prevent the large butterfly valve from getting stuck and failing to function in an emergency, so a slight degree of opening is maintained. But in this way, less smoke enters the flue, which is a waste. Moreover, since the small butterfly valve is fully open, using the large butterfly valve to regulate the regeneration pressure is unreasonable; the small butterfly valve should be used for pressure regulation. In short, my feeling is that butterfly valves are not reliable; it’s better to use double-acting slide valves instead.
Thank you for the reply. May I ask, what if the butterfly valve gets stuck at a low opening angle? Wouldn’t it be even more dangerous if the pressure in the regenerator couldn’t be reduced in an emergency?
In other words, during operation, it is necessary to open and close the high-temperature valve regularly in order to prevent it from sticking.
As long as there is a slight gap, it’s not easy to get stuck.