BuildingSystems.Fluid.Actuators.Valves.ThreeWayLinear

# .BuildingSystems.Fluid.Actuators.Valves.ThreeWayLinear

Three way valve with linear characteristics

## Information

Three way valve with linear opening characteristic.

This model is based on the partial valve models BuildingSystems.Fluid.Actuators.BaseClasses.PartialThreeWayValve and BuildingSystems.Fluid.Actuators.BaseClasses.PartialTwoWayValve. See BuildingSystems.Fluid.Actuators.BaseClasses.PartialThreeWayValve for the implementation of the three way valve and see BuildingSystems.Fluid.Actuators.BaseClasses.PartialTwoWayValve for the implementation of the regularization near the origin.

## Revisions

- March 7, 2022, by Michael Wetter:
  Set `final massDynamics=energyDynamics`.
  This is for #1542.
- June 10, 2021, by Michael Wetter:
  Changed implementation of the filter and changed the parameter `order` to a constant as most users need not change this value.
  This is for #1498.
- November 5, 2019, by Michael Wetter:
  Moved assignment of leakage from BuildingSystems.Fluid.Actuators.BaseClasses.PartialThreeWayValve to the parent classes.
  This is for #1227.
- February 20, 2012 by Michael Wetter:
  Renamed parameter `dp_nominal` to `dpValve_nominal`, and added new parameter `dpFixed_nominal`. See BuildingSystems.Fluid.Actuators.UsersGuide.
- February 14, 2012 by Michael Wetter:
  Added filter to approximate the travel time of the actuator.
- March 25, 2011, by Michael Wetter:
  Added homotopy method.
- June 16, 2008 by Michael Wetter:
  First implementation.

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