107. What is the function of the electric valve at the main fan outlet, and what are the requirements for it?
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107. What is the function of the electric valve at the main fan outlet, and what are the requirements for it?
It cuts off the connection between the main fan and the system, ensures the normal operation of the unit and the system during the shutdown process, and serves as supplementary protection for the one-way damping valve and the outlet check valve.
Function: When the main fan starts or stops, the outlet electric valve is closed and the bypass vent valve is opened, allowing the main fan to operate at a lower load. During the switching between the two fans or when starting them up, the electric valve can be used to open and close slowly, thereby ensuring smooth operation and preventing air flow from passing between the two fans. When the fan is shut down, this prevents catalyst from flowing into the main fan; therefore, it is necessary that the valve has good sealing properties and that its opening and closing speeds are consistent.