breather valves

End of Line Breather Valve (PVRV)

Critical safety valves (PVRV) installed on storage tanks to protect against structural damage from internal pressure changes. Automatically regulates overpressure and vacuum during filling, emptying, or thermal fluctuations, reducing evaporation losses. Designed to API 2000 and ISO 28300 standards.

Category:

Description

Critical Structural Protection for Storage Tanks

An End-of-Line Breather Valve, also known as a Pressure/Vacuum Relief Valve (PVRV), is an essential safety device installed on atmospheric and low-pressure storage tanks. Its primary function is to protect the tank against catastrophic structural damage (such as implosion or rupture) resulting from internal pressure changes.

Automatic Regulation & Evaporation Control: The valve maintains a perfectly sealed state under normal conditions to significantly reduce evaporation losses and environmental emissions. It automatically reacts to regulate overpressure (venting) and vacuum (breathing) conditions that occur during normal tank filling and emptying operations, or due to thermal fluctuations caused by atmospheric temperature changes.

Design & Standards: Manufactured strictly in accordance with API 2000 and ISO 28300 standards, these valves are available in both weight-loaded and spring-loaded configurations to meet precise operational requirements.

Additional information

Nominal Size

NPS 2” ~ 12”
Outlet Pressure (Venting)

2 mbar ~ 69 mbar (Weight Loaded), 26 mbar ~ 1034 mbar (Spring Loaded)
Inlet Pressure (Vacuum)

2 mbar ~ 43 mbar (Weight Loaded), 43 mbar ~ 48 mbar (Spring Loaded)
Design Standard

API 2000 / ISO 28300
Body Material Grade

A216 WCB, A351 CF3/M, A351 CF8/M (Other materials on demand)
Internal Parts Material

A182 F304, A182 F316/L (Other materials on demand)

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