Fig 1 Fig 2

The injector is installed around a point of restriction such as a regulator valve or a gate/ball valve to create a differential pressure across the injector. This allows the injector to produce a vacuum and draw in material. (See Fig.1 and Fig.2)

Fig 3

The injector is installed on the mainline and the pressure reducing device is on the bypass. Chemical injection can be turned on when the control valve is closed. When the valve is open, injection stops due to reduced pressure differential. (See Fig.3)

Fig 4

The injector is installed on a bypass with a booster pump. When mainline pressure cannot be reduced, a small booster pump can be used to create sufficient differential pressure to operate the injector.(See Fig.4)