Unbranded Venturi Fertlizer Injection 50mm C/W Suction Hose Assembly

The venturi  uses a pressure differential between the inlet and outlet to create suction. This requires no moving parts for incredible reliability. It requires about a 25% difference to start suction.

To make sure the venturi will be able to operate on your system, you need to know your operating pressure and flow required for your driptape or sprinklers. The pressure of your system will determine the flow needed. First, find the pressure on the far left of the chart that is closest to yours. Based off that pressure, the chart will tell you the motive flow required for each size of venturi to create suction. For example, if you had 50PSI you would need 8.7gpm with a ¾” injection, for a 1” injection you would need 25gpm of flow through the venturi and so forth. Without the proper flow at the given inlet pressure the Venturi will not create suction.

The venturi should be installed horizontally. It can be installed vertically but the outlet must be on top to not trap air. It can either be installed in-line with your water source or it can also be installed around any point of restriction that creates a pressure loss, like a valve that can be closed slightly. It is best to install a pressure gauge on the inlet and outlet to monitor the differential which will determine your suction rate available. The venturi includes a simple flow meter with a ball valve to help dial in the suction rate needed.

If using the venturi for a drip system make sure your flow while running meets the minimum required for the venturi to create suction. The minimum will change based on your inlet pressure. The best way to size a venturi is off the suction rate needed for the ratio of fertilizer desired.tg