Damcos DRLV-3 Double Pressure Reduction Valve.
The DRLV-3 is a double pressure reduction valve used to reduce actuators torque/thrust. It adjust actuators with a high torque/thrust to protect the valve. The DRLV-3 is used both for rotary and linear actuators that in some cases provides too high torque/thrust to the valves. The throttle block has NG6 connection.