The Girard Equipment 3" Magnetic Vacuum Breaker is a valve designed to prevent negative pressure (vacuum) from developing and imploding a typical tank transport.
Girard Equipment uses a permanent magnetic force along with conventional springs to control the movement of the valve seat. Permanent magnetization within the valve, holds the seat tightly closed during transit and allows movement only on demand of 2" Hg, or greater.
The unit is equipped with either a "Tef-O-Sil" "O" Ring, Viton? "O" Ring, or a Kalrez? gasket to meet the requirements for bubble-tightness given in docket HM-183.
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