EN Pressure and Vacuum Breather Vent (Normal Vent)

A pressure/vacuum vent designed for use on tanks for transport of dangerous goods. This vent is constructed of aluminum with stainless steel springs and stem. A brass screen is included as standard. The vent is designed tested and marked to meets requirements of EN 14595:2016.

  • Dual Purpose Vent
  • Roll Over Protection
  • Compact Design
  • Interior Mount

The Betts’ Normal Vent is the proven standard of the fuel transport industry. Normal Vents (breather vents) are utilized to normalize internal tank vacuum and pressure, which is critical to keep the cargo tank pressure within safe design limits. This vent incorporates a unique weighted roll-over block which increases the set pressure of the vent in a roll over situation but does not act as a shutoff device like other manufacturer’s designs. This feature differentiates the Betts’ design and allows the vent to maintain its primary function as a pressure/vacuum relief device in all situations. The vent is flow tested and marked in accordance with EN/ADR requirements.

NOTE: While normal vents provide limited vapor venting during loading/unloading, it is recommended that positive vapor valves (typically air operated) be provided when loading/unloading with the manhole closed. If positive vapor valves are not used, insure normal vent is functioning properly or open manhole cover before beginning loading/unloading. Failure to do so may result in head reversals or other tank failure.

Product Details

Part #Mounting
Threads
Body
Material
Tank MWPSet Pressure
(Out Breathing)
Pressure Flow Capacity
(Out Breathing)
Vacuum Set
(In Breathing)
Vacuum Flow Capacity
(In Breathing)
Weight
6866AL*1.625-12 UNAlum.27.1 kPa
(3.93 psig)
6.8 to 12 kPa
(.99 to 1.74 psig)
51.8 scmh @ 36.8 kPa
(1,830 scfh @ 5.34 psig)
1.5 to 2.5 kPa
(.22 to .36 psig)
58.4 scmh @ 4.5 kPa
(2,064 scfh @.65 psig)
.45 kg
(1.0 lbs)
6866AL*-BSP1.25 BSPAlum.27.1 kPa
(3.93 psig)
6.8 to 12 kPa
(.99 to 1.74 psig)
51.8 scmh @ 36.8 kPa
(1,830 scfh @ 5.34 psig)
1.5 to 2.5 kPa
(.22 to .36 psig)
58.4 scmh @ 4.5 kPa
(2,064 scfh @.65 psig)
.45 kg
(1.0 lbs)
Part #Mounting
Threads
Body
Material
Tank MWPSet Pressure
(Out Breathing)
Pressure Flow Capacity
(Out Breathing)
Vacuum Set
(In Breathing)
Vacuum Flow Capacity
(In Breathing)
Weight
6714AL*1.625-12 UNAlum.27.1 kPa
(3.93 psig)
10 to 12 kPa
(1.45 to 1.74 psig)
47.4 scmh @ 40 kPa
(1,673 scfh @ 5.8 psig)
1.5 to 2.5 kPa
(.22 to .36 psig)
53.5 scmh @ 4.5 kPa
(1,889 scfh @ .65 psig)
.45 kg
(1.0 lbs)
6714AL*-BSP1.25 BSPAlum.27.1 kPa
(3.93 psig)
10 to 12 kPa
(1.45 to 1.74 psig)
47.4 scmh @ 40 kPa
(1,673 scfh @ 5.8 psig)
1.5 to 2.5 kPa
(.22 to .36 psig)
53.5 scmh @ 4.5 kPa
(1,889 scfh @ .65 psig)
.45 kg
(1.0 lbs)
* Replace with letter code designate seal material

"B" = Nitrile
"V" = FKM type "A"
"VB" = FKM type "B"

Engineering Bulletins

EB-01-22: Breather Vent Overturn Protection ADR/EN Requirement and Compliance