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Girard Vents


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Replacement Parts

Girard DOT 407 Pressure Relief Vents

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3" Dot 407 Pressure Relief Vents Function
Girard Equipment, Inc.’s Three Inch DOT 407 Vents allows you to upgrade virtually any MC 307 or MC 312 tank to DOT 407 or DOT 412 venting. All the benefits of the 400 Series Vents without expensive hot-work. Flow rates are slightly less than our standard DOT 407 Vents, but are more than sufficient for most tanks.

The stainless steel valve seat seals on a Teflon® encapsulated silicone "O" Ring. This “O” Ring provides complete chemical resistance and a bubble-tight seal to meet the latest DOT requirements. The unit also meets the surge requirements of 178.345-10 (b) (3).


4" Dot 407 Pressure Relief Vents Function
Girard Equipment, Inc.’s Low Profile DOT 407 Vents ...
DOT-407

DOT 407 Combination Pressure/Vacuum Relieving Vent

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3" Dot 407 Pressure Relief Vents Function
Girard Equipment, Inc.’s Three Inch DOT 407 Vents allows you to upgrade virtually any MC 307 or MC 312 tank to DOT 407 or DOT 412 venting. All the benefits of the 400 Series Vents without expensive hot-work. Flow rates are slightly less than our standard DOT 407 Vents, but are more than sufficient for most tanks.

The stainless steel valve seat seals on a Teflon® encapsulated silicone "O" Ring. This "O" Ring provides complete chemical resistance and a bubble-tight seal to meet the latest DOT requirements. The unit also meets the surge requirements of 178.345-10 (b) (3).


4" Dot 407 Pressure Relief Vents Function
Girard Equipment, Inc.’s Low Profile DOT 407 Vents ...
DOT 407 Magnetic Vacuum Bre

Magnetic Vacuum Breaker

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"New Generation" DOT 407 Magnetic Vacuum Breaker Function
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.
Viton, Teflon and Kalrez are standard. Special Elastomers are available upon request.

Magnetic Vacuum ...
MC 307 Pressure Relief Vent

MC 307 Pressure Relief Vent

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Function
The MC 307 Pressure Relief Vent is a stainless steel, pressure actuated unit that is engineered to limit excessive internal pressure to 130 percent of tank design. The standard model vent set at 25 PSIG will exhaust 26,700 SCFH at 32.5 PSIG and conforms to the emergency venting requirement code for MC 307 tanks having a total exposed surface area up to 700 square feet.

The stainless steel valve seat is equipped with a replaceable Tef-O-Sil "O-Ring."

The unit doubles as an unloading device, since the valve body is tapped 3/4" N.P.T. to accommodate the addition of inlet fittings for air unloading of transports. Provision is also made for a pressure gauge to be attached to the vent body. An optional ...
DOT-407-LW

Special "Weld-In" DOT 407 Pressure Relief Vent


Function
Girard’s Special Low Profile "Weld-In" (LW) Series DOT 407 Vent combines an ultra-low profile, light weight design with high flow rates to meet the most demanding needs of virtually any tank. See the table below for specific flow rates. The LW Vent welds directly to your manlid, thus avoiding expensive hot-work to the shell of your tank, and is low enough to be "retro-fitted" to most any tank, without having to alter the overturn protection.
LW Vent - Designed to weld directly to a domecover.
Superdome

Superdome


The Superdome Contains
  • Girard DOT407LW - Pressure Relief Vent with the "T" Wrench disassembly feature.
  • Girard 407MVB-LS - T "New Generation" Magnetically Controlled Vacuum Breaker.
  • Stainless Steel Air accessory package: 1" Full Port Ball Valve, 45º Elbow, Universal "Chicago" connection with dust cap.
  • Girard liquid-filled pressure gauge (0-60 PSI) housing and all internal components are stainless steel.
  • Betts model 8310LCW Manhole cover and collar (6- Hold Down)
  • Girard 3" Stainless Steel Cap on a 3" nozzle. Built in accordance with RP33-98 “Screw Threads for Clean-Out Nipples"
  • Two strategically placed sealing/security tabs.
  • 1/8" vinyl coated stainless steel braided cable attached to 3" Cap.
GE-DOT-3X407-AFTL

TuFliner™ VENT (DOT 3X407 AFTL)

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Function
Girard Equipment, Inc.'s Teflon® lined Pressure Relief Valve is designed to protect against aggressive ladings that normally would chemically attack stainless steel.

All wetted surfaces are lined with a 1/8" thick Teflon® liner. The valve seat seals on a Teflon® encapsulated silicone "O" Ring. This "O" Ring provides complete chemical resistance and a bubble-tight seal. The vent is designed to be easily removed from the tank for inspection and or cleaning.
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