MapleSim Hydraulics Library from Modelon DirectionalControl - Overview These classes model directional control valves actuated by electric coils.  The laminar/turbulent flow through the valve is modelled as flow through orifices without cavitation.  The commanded opening of the valve is input at commandA or commandB, respectively. The flow capacity of the valve is specified by parameter ${q}_{\mathrm{nom}}$ at the pressure drop ${\mathrm{Δp}}_{\mathrm{nom}}$.  When the pump pressure and the flow rate is high, the unbalanced forces and flow forces acting on the spool are higher than the force generated by the solenoid and the valve is partially closed. The effect can be modelled by the parameters ${P}_{\mathrm{max}}$ and ${\mathrm{coeff}}_{P}$. The movement of the spool is described by a first-order system. This is appropriate for valves that are directly actuated by a spool. The time to shift from the neutral position to an end position, ${\mathrm{\tau }}_{\mathrm{opening}}$, may be different from the time to shift to the neutral position, ${\mathrm{\tau }}_{\mathrm{closing}}$. DCV_3_2_PAB - 3 ports, 2 stable positions DCV_3_2_PAT - 3 ports, 2 stable positions DCV_4_2_A - 4 ports, 2 stable positions DCV_4_2_X - 4 ports, 2 stable positions, user-configurable flow-paths DCV_4_3_A - 4 ports, 3 stable positions DCV_4_3_B - 4 ports, 3 stable positions DCV_4_3_C - 4 ports, 3 stable positions DCV_4_3_D - 4 ports, 3 stable positions DCV_4_3_X - 4 ports, 3 stable positions, user-configurable flow-paths DirectionalControl[Basic] - Basic models for directional control valves DirectionalControl[Basic][Internal] - Internal models