For irrigation, we have about more than 50000 L of large tank and the outlet of 2 inches (thick red – high pressure) goes through the ground for drip irrigation. Now I need another small tank of 200 L with some liquid(nutrient for soil) to be added along with water. Though the outlet of tank B will be 1/2 inch, the water pressure(in drops) will be control using a gate value. Since the existing water flow is very high pressure, just directly connecting the outlet from tank B to the existing water pipe may result in water being pumped into tank B.
Though in picture, the position of the outlets are in middle, actually it will be in bottom.
Will check valve be the solution here? Since the outlet flow from tank B will be drops and the from tank A it will be very high pressure, could the valve open so that those drops will get mixed with existing water flow?
If check valve is not the right one what should use here?
Best Answer
Please Google "venturi fertilizer injector" to learn about this technology. It is a device that works with no electric power. The flow of a large amount of liquid through the device creates a vacuum that will suck a smaller quantity of a second liquid into the main flow.
In this case you would use a check valve on the small tank to prevent backflow in case the main flow stops. No flow = no vacuum, which could cause backflow if there is no check valve.