====Non-Return====

Some assets may be marked as 'non-returns' for specific types of relationship. This is often found in regulators, one-way-valves, signal isolators etc.

Non-return assets prevent [[property flow|property flow]], [[zero energy|zero-energy checks]] and [[isolation|isolation checks]] from proceeding any further up-stream. 

Below is an example based on our discussions of [[property flow]] - in this case, the non-return valve prevents the filter from getting attributes from assets further up the water line. 

{{non_return.png}}