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R9 and R121 tank pressure relief valves

R9 and R121 tank pressure relief valves

These valves relieve positive tank pressure and do not perform the same combined duty as a pressure-and-vacuum valve. R9 is shown with direct discharge, while R121 provides a pipe-away outlet arrangement within the pressure-relief family. The size range is DN25–DN300 with a positive setting limit of 40 mbar. Carbon steel, 304 or 316 stainless steel and aluminium bodies are described, with ISO PN10 or Class 150 flanges.

Technical specifications

ModelsR9 / R121
DutyPositive pressure relief
SizeDN25–DN300
Setting limit+40 mbar
FlangesISO PN10 / Class 150