Modular type - To unlock the handle , pull it until the orange marked underneath it shows. And then push the regulating handle again to lock after setting pressure.
T type - To unlock, unscrew the nut attached to the regulating handle. To lock the handle, screw the nut after setting pressure.
②
When regulating pressure, turning the handle to the right raises the pressure of secondary side. Turning to the opposite(left) direction drops the pressure.
③
Regulating pressure range of the secondary side is less than 85% of the first side.