This is a model of a dual pressure valve with lumped volumes. If the pressure is lower on port a than on port b, there is flow between port a and port t; otherwise there is flow between port b and port t. There are first-order dynamics in the spool with the time constant t1. The valve works as a hydraulic "min" gate.

Implementation

This valve basically consists of orifices controlled by the pressure difference between port a and b sent through a lowpass filter.

medium	Value: Oil() Type: Medium Description: Medium in the component
V	Value: 0.0001 Type: Volume (m³) Description: Volume of control valve
Gleak	Value: 9.999999999999999e-21 Type: PressureDependentLeakage (m³/(s⋅Pa)) Description: Leakage between ports
t1	Value: 0.1 Type: Time (s) Description: Time constant for first-order system
A	Value: 0.001 Type: Area (m²) Description: Opening area when opened
Cd	Value: 0.62 Type: Real Description: Coefficient of discharge for an opening