Simple choker flow rate valve, QTM3 is an unsched -off flow rate valve, with a non -return valve for reverse free flow, made in modular version. They are available both valves for incoming control and for the control out of the topor. The reversible versions (QTM3-G*) are equipped with an O-Ring port plate and usable both for outgoing and incoming control control, depending on the chosen assembly direction. It is supplied with adjustment screw with recessed hexagon.