A smooth introduction into the chapter "proportional hydraulics":
Proportional or continuous valves are electronically actuated valves which change the output signal (pressure, volume flow or switching position of a way valve) in the same way to the control signal (usually a control voltage between 0 and 10 V).
fig.: overview - contiuous valves
Servo valves, which are particularly suitable for demanding positioning tasks due to their precision and hysteresis properties.
! Which advantages and disadvantages have continuous valves compared to binary valves?
|+ simplify circuits||for example a proportional valve replaces a directional valve and a flow control valve|
|+ Continuous adjustment of flow and pressure via an electrical control signal during operation||By adjusting flow and pressure continuously you can get a precise position and angle, acceleration and speed, force or torque.Possibility to form a closed loop system.|
|+ Optimization of wear and energy consumption||By adapting pressure and flow as needed during operation.|
|- Oil must be cleaned particularly well when using continuous valves.||Sensitivity of the switching piston.|