There are many different types of adjusting valve in the intake box of centrifugal fan. Not only can the parallel adjusting valve be used, but also the opposite blade adjusting valve be used to control the air flow through the centrifugal fan system. But we must pay attention to their respective installation forms. If parallel blades are installed, the blades should be parallel to the axis of the fan, so that the forced inlet eddy current can be generated in the partially closed position.
The opposed blade has different control principles. It changes the system by increasing the pressure loss caused by adjusting the local closing position of the valve, so as to control the air flow. Regardless of which type of regulating valve, reasonable installation is the premise to ensure its normal use.