Originally Posted by Freediver
Hi, does anybody have any insight as to why some of the FC line of Mil Spec Zodiacs e.g. FC530 have the Mirada valves. I was under the impression that the I/C Valves used to inflate the craft had an overpressure relief feature. If that is the case why the need for another 4 or 5 OPV's?
The IC valves are very imprecise as OPVs... the OPV feature is moreso for short durations of overpressure, say, when two vessels collide at speed or after launching the boat over a wave and smacking in to the water.
The Mirada OPVs are finely adjusted and have a tolerance of about +/- 0.5 psi. They usually start to lift at about 3.1 psi or so if they're old. They're designed to be trusted as "when they start letting air out, the boat is at the proper pressure".