When reservoir side water level rise up, Flap Gate will open and discharge the water. However either reservoir side water level drops down or exterior side water level goes up, flap of gate will drop by gravity and close itself. Thus it prevents reverse flow accordingly.
Flap Gate with air chamber in gate leaf [Patent no. 10-0520909, KR]
With application of patent (10-0520909, KR), Hasuh Flap Gate durable against the highest wave pressure and corrosion while the gate is installed at the seashore.
Hasuh Flap Gate is excellent at preventing back flow through the gate due to provision of air chamber and vertical installation.
Compare with the other's flap gate, Hasuh one shows excellent durability and operability