Non-return valve
Non-return valves are not automatically classified in the non-return valve category.
If you do not correspond to any part type listed here according to the definition, you will be listed as not assigned on the right.
If there are not assigned they will not be calculated.
Then assign these elements to the category non-return valve by "edit" so that they can be directly linked to the equivalent length table during the calculation.
This means that these elements get the additional length, depending on the dimension, from the selected table during the calculation.
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