| 摘要 |
PURPOSE: A backflow prevention valve is provided to implement opening/closing of a backflow prevention plate in a desired pressure condition and restrict noise and abrasion of a drive unit. CONSTITUTION: A backflow prevention valve comprises a main body(110) which has a fluid passage hole, a backflow prevention plate(120) which is arranged to open and close in the fluid passage hole of the main body and allows one-way flow of fluid, a drive unit(130) which drives the backflow prevention plate, a support bar(150) which is connected between the backflow prevention plate and the drive unit in order to support the backflow prevention plate to the drive unit, and an opening degree control unit(160) which is connected to the drive unit and controls the opening degree of the backflow prevention plate according to weight.
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