The breather valve is a combined pressure/vacuum relief system, and it is designed for marine tankers and chemical tankers. The breather valve is designed and constructed to comply with IMO MSC/cirs 677.
International Standard
IMO MSC/Circ.677
IMO MSC/Circ.1009
IMO MSC.1/Circ.1324
ISO 15364:2021
ISO 16852:2016