| I.P Abstract & Summary |
The invention relates to a non-electrical reverse flow prevention device comprising: a body having a wastewater inlet at its front, a wastewater outlet at its rear, and a longitudinal wastewater trough in the middle of which; a door assembled around an axis with the body at its rear to open or close the outlet, wherein the door comprises: a number of spaced connecting parts; and a guide groove arranged on the floating parts to rotate around an axis upwards by buoyancy to close the outlet, and to rotate around an axis downward by gravity when there is no reverse flow of wastewater to open the outlet, and subsequently to conduct wastewater from the outlet. |
