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The air relief valve type "water sea" offers a remarkable hydraulic characteristics very small footprint.
Having been the subject of a patent, this design has the advantage of eliminating any risk of water hammer at the end of fill pipe.
This sucker for a PFA of 25 bars, and one type is proposed and this in :
AIR OUTLET HIGH VOLUME FILLING LINE
Remplissage de conduite
PURGE AIR FROM THE LINE-UPE
INPUT HIGH-VOLUME AIR
Drain driving accident (breakage etc ...)
SAFETY VALVE ADJUSTABLE by OVERSPEED
Prevents water hammer at the end of filling closing beyond a threshold, while allowing a moderate air flow.
Specification leaflet available on demand firstname.lastname@example.org