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A check valve is a type of valve used in the centralized smoke exhaust ducts of residential kitchens and bathrooms, which plays a role in smoke exhaust, smoke backflow prevention, and fire prevention. Traditional fire check valves mostly have the rotating shaft of the blades in the middle and upper part of the smoke inlet. When the smoke exhaust fan is turned on, the blades can be blown open, but the smoke will flow in the lower part of the smoke exhaust duct after entering the smoke exhaust duct. Since the airflow in the smoke exhaust duct should flow upward, when the upward airflow encounters the downward airflow, the resistance will increase, and the velocity of the upward airflow will decrease, affecting the smoke exhaust capacity. When the resistance of the upward airflow on the same smoke exhaust duct is large enough, the smoke exhaust system cannot exhaust smoke, and the phenomenon of smoke return will occur. For residents who have not turned on the smoke exhaust fan, other people's smoke will enter their homes, and annoying things will begin.
There is currently a smoke exhaust fire check valve with a rotating shaft located at the lower part of the smoke inlet. The rotating shaft is movable. When the smoke exhaust fan is turned on, the bottom edge of the blade rotates to open the blade, and the airflow flows diagonally upward into the smoke exhaust duct. After entering the smoke exhaust duct, the impact on the rising airflow inside the duct is small, and the smoke exhaust will be smooth, with a large smoke exhaust volume and relatively low noise of the smoke exhaust fan. When the smoke exhaust fan is turned off, the counterweight installed at the lower part of the blade will pull the blade back to achieve the function of closing and stopping. Proper weight setting can make the opening angle of the blades close to 90 degrees.
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