BuildingSystems.Fluid.Actuators.Valves.TwoWayButterfly

# .BuildingSystems.Fluid.Actuators.Valves.TwoWayButterfly

Two way valve with the flow characteristic of a typical butterfly valve

## Information

Two way valve with the flow characteristic of a typical butterfly valve as listed below.

#### Implementation

The model assigns a `Kv` based on the table at mydatabook.org. The `Kv` values listed in the parameter `Kvs` are reasonable assumptions, but the actual value can depend much on the design of the specific valve. Moreover, the `Kv` values for DN value smaller than DN 150 are a quadratic extrapolation from the value at DN 150.

## Revisions

- 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.
- December 22, 2020 by Michael Wetter:
  Add parameter `Kvs`.
- December 20, 2020 by Filip Jorissen:
  Revised implementation with default `Kv` computation.
- July 8, 2018 by Filip Jorissen:
  First implementation.

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