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How are minor losses applied to valves in WaterGEMS and WaterCAD?
It is possible to apply minor losses to valves in addition to any losses that will occur due to the activity of the valve as well. However, the minor loss is only applied when the initial or calculated status of the valve status is Inactive, meaning that the valve is fully open. This will applied to valves like FCVs, PRVs, and PSVs.
For instance, if you have an FCV with a flow setting of 100 gpm but the flow through the valve is 50 gpm, the FCV will be considered to be fully open and have a calculated status of Inactive, and any minor loss entered for the FCV will be applied to the results.
For valves like PBVs, there is no Inactive status. The valve is either closed or active. If you enter in a non-zero hydraulic grade or pressure setting, that setting will be applied and the PBV will be partially closed. If you set the PBV setting to zero, you would see the minor loss applied to the results.
For GPVs, minor losses are not appliable.
The Help documentation in WaterGEMS and WaterCAD has additional information on applied minor losses and how different valve types work.
Minor losses for Isolation Valves
How are headlosses determined for TCV's with the different initial status settings?