cast iron square flap valve

square flap: Installed at the end of the drain pipe, it has a check valve to prevent the external water from flowing back. The door is mainly composed of a valve seat, a valve plate, a water seal ring and a hinge. Shapes are divided into circles and squares

It is a one-way valve installed at the outlet of the riverside drain pipe. When the tidal level of the river is higher than the outlet pipe and the pressure is greater than the pressure inside the pipe, the flap panel is automatically closed to prevent the river tidal water from pouring into the drainage pipe.