Urgent follow-up on the issue with the one-way damping valve
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What if an accident occurs and a single damping valve does not close completely?
There is a one-way damping valve at the outlet of the main fan here, followed by an electric butterfly valve; if it cannot be closed, the electric butterfly valve can be shut off on-site
The one-way damping valve won’t close properly – how can I get it to close? Can I use a large wrench?
It seems not possible; we’ve had cases where one-way damping valves wouldn’t open, and in those situations we had to use levers to force them open
If it can’t be closed properly, try to close the other valves; don’t force it
Generally, the outlet of the main fan is equipped with a check valve and a check damping valve, providing a dual safety mechanism! It really can’t be controlled; never try to force it!
Having experienced it firsthand, there are check valves and main dampers at the outlet of the main fan. When a power outage occurred, the main damper responded slowly and did not function properly, causing the catalyst to flow back toward the damper. Fortunately, the check valves worked well, preventing the catalyst from entering the main fan. During startup and the process of introducing air into the system, the damper had to be manually opened; multiple times pressure built up at the outlet of the main fan (without the fan experiencing any issues) before the air could be integrated into the system!
This damping valve cannot be closed casually; it is part of a interlock system. When the main fan stops operating, proper daily maintenance will ensure that the system can protect itself, and its purpose is mainly to prevent the catalyst from flowing back into the main air pipeline.
How is this valve maintained on a regular basis? Usually, we don’t move these kinds of valves at all