the line between foam bladder tank and deluge valve should be empty or filled with water or foam .
If the system valve is a deluge valve, there is no pipeline directly connecting the bladder tank to the system valve. Any pipeline downstream of a deluge valve should be empty. However, if you mean by deluge valve what is actually called the foam concentrate control valve, then the pipeline between the bladder tank and the foam concentrate control valve is always filled with foam concentrate.
yes it should be empty until the deluge operate
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