Definition(s)
Fill-Up (Flood) Valve
A differential pressure-set valve installed on marine risers that automatically permits seawater to enter the riser to prevent collapse under hydrostatic pressure after evacuation caused by lost circulation or by gas circulated into the riser.
Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards