7140 / 8140 series is a vacuum relief valve, which can avoid tank damage due to overpressure or negative pressure, and can greatly reduce the evaporation loss caused by tank "breathing".

Specification 2 "~ 12" (DN50 ~ DN300)

Positive pressure setting 0.2 ~ 103.4kpa

Design and inspection standard api2000

Flange standards: ANSI B16.5, en1092, JIS, Hg / t20592 ~ 20615, GB / t9113, etc