Tank relief valves

4 models in this family

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Selected model

Tank pressure and vacuum relief valve

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The pressure-and-vacuum relief valve keeps an atmospheric storage tank between two set points. During filling and emptying, its pressure and vacuum functions protect against excessive internal pressure or suction, while effective closure limits evaporative losses. Body materials are aluminium, carbon steel or stainless steel, with stainless-steel pallets and seats. PTFE or elastomer is used for the diaphragm or gasket. The combined pressure/vacuum family is described in DN50–DN300 with settings from −40 to +40 mbar. Atmospheric discharge and pipe-away arrangements must be selected separately.

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Selected model specifications

Function	Atmospheric-tank pressure and vacuum protection
Combined-family sizes	DN50–DN300 / 2–12 in
Family setting range	−40 to +40 mbar
Body	Aluminium / Carbon steel / Stainless steel 304 or 316
Pallet and seat	Stainless steel
Flange	ISO PN10 / Class 150

Models and configurations

Select a configuration. The family image changes only when the model has a distinct illustration.

Tank pressure and vacuum relief valveFunction: Atmospheric-tank pressure and vacuum protection · Combined-family sizes: DN50–DN300 / 2–12 in · Family setting range: −40 to +40 mbar · Body: Aluminium / Carbon steel / Stainless steel 304 or 316 · Pallet and seat: Stainless steel · Flange: ISO PN10 / Class 150The pressure-and-vacuum relief valve keeps an atmospheric storage tank between two set points. During filling and emptying, its pressure and vacuum functions protect against excessive internal pressure or suction, while effective closure limits evaporative losses. Body materials are aluminium, carbon steel or stainless steel, with stainless-steel pallets and seats. PTFE or elastomer is used for the diaphragm or gasket. The combined pressure/vacuum family is described in DN50–DN300 with settings from −40 to +40 mbar. Atmospheric discharge and pipe-away arrangements must be selected separately.

R102 tank vacuum relief valveType: R102 · Function: Vacuum relief · Size range: DN50–DN300 · Vacuum setting limit: −40 mbar · Body materials: Carbon steel / Stainless steel 304 or 316 / Aluminium · Flanges: ISO PN10 / Class 150The R102 vacuum relief valve protects a tank against a reduction in internal pressure. It admits air to compensate for vacuum and is a separate configuration from an emergency pressure vent. The size range is DN50–DN300, with a vacuum setting limit of −40 mbar. Body material options include carbon steel, 304 or 316 stainless steel, and aluminium. Specify the required vacuum setting and ISO PN10 or Class 150 flanges when requesting a quotation.

R128 tank emergency ventType: R128 · Function: Emergency tank pressure relief · Size range: DN400–DN600 / 16–24 in · Setting range: +10 to +50 mbar · Body materials: Carbon steel / Stainless steel 304 or 316 · Flanges: ISO PN10 / Class 150The R128 emergency vent relieves positive pressure from a storage tank. It has a larger opening than the R102 vacuum relief valve and serves the pressure discharge path rather than the admission of air to compensate for vacuum. The size range is DN400–DN600, or 16–24 inches, with positive settings from 10 to 50 mbar. Carbon steel and 304 or 316 stainless steel body materials are described, with ISO PN10 or Class 150 flanges. State the required size, pressure setting and material in the inquiry.

R9 and R121 tank pressure relief valvesModels: R9 / R121 · Duty: Positive pressure relief · Size: DN25–DN300 · Setting limit: +40 mbar · Flanges: ISO PN10 / Class 150These 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.