Magnetic Vacuum Breakers
"New Generation" DOT 407 Magnetic Vacuum Breaker
The DOT 407 Magnetic Vacuum Breaker is a valve designed to limit negative pressure (vacuum) in a typical tank trailer.
A permanent magnetic force controls the movement of the valve poppet to open on demand of 4" Hg or greater. All working parts are kept away from the airflow paths, which promotes easy cleaning and hassle-free repairs. The valve body is cast with a 1" female port inlet to accept a variety of air inlet fittings. A 1⁄4" female port is standard to accept a gauge. The unit is equipped with either: a "Tef-O-Sil", Viton, or a Kalrez® O-Ring seal.
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"New Generation"
DOT 407 Magnetic Vacuum Breaker
The new ultra low-profile Magnetic Vacuum Breaker is a valve designed to limit a negative pressure (vacuum) in a typical tank trailer.
This model has a 3" NPS swivel connection and stands less than 4" when installed a typical tank nozzle making it easy to install under already existing overturn protection.
Customers interested in purchasing the older MC307 style 3MVB should consider this new model which is lower in cost and will provide an increased flow rate over the 3MVB.
Magnetic Vacuum Breaker (MC 307 Style)
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.