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Control valve rangeability: KVS/KV0. The theoretical range between the maximal (KVS) and minimal (KV0) controllable flows. By default, the parameter is set at 30100.

Control valve real rangability: KVS/KVr. The real controllable range between the maximal (KVS) and minimal (KVr) controllable flows. This value is always smaller than the theoretical range. By default, the parameter is set at 2595.

Info

The greater the rangability values, the better the control action of the valve. When you notice in the software that the lift of a control valve is cycling continuously (usually between small values), it might be useful to further increase the rangeabilitiesfrom 30 & 25 to 100 & 95 or even to 500 & 495. This usually leads to a more stable control output, which can drastically reduce simulation times, but it might make the theoretical simulation to perfect. The downside of this action is possibly a too perfect, theoretical simulation.

Minimal authority: The lower limit that is imposed to the Optimiser while running the ‘Optimise components’ step. By default, the parameter is set at 0.3. More information on a valve’s authority can be found here: https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089204794/Control+valve+authority.

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