2025 EN Catalog-Interactive - Flipbook - Page 169
DEFENDER SERIES®
PRESSURE / VACUUM
VENT WITH FLAME
ARRESTOR OPTION
Defender Series® Pressure/Vacuum (P/V) Vents regulate the pressure
at which vapour is allowed to escape from the underground storage
tank and the vacuum at which outside air is allowed to enter the tank.
The P/V Vent's internal rolling diaphragm delivers consistent and
controlled cracking for both low leak and high-pressure conditions
while the superior construction of UV-resistant materials extends the
overall service life. The in-line vault provides added protection and
facilitates at-grade servicing and testing. This eliminates the added
expense of lift trucks as well as the potential safety concerns of
conducting work at height.
HIGHLIGHTS
SPECIFICATIONS
Pressure / Vacuum Vent
· The P/V vent is constructed of high-grade, UV-resistant
· A vent cap with stainless steel mesh debris shield protects
the system from water and insect intrusion.
· The one-turn locking mechanism provides easy installation
and removal for servicing.
· High tolerance for over-pressure situations.
· Compatible with all fuel types.
· A rolling diaphragm achieves low leak rates and high flow
rates with a tight and consistent seal.
· Vent Stack Adapter available with 2" NPT or 2" BSPT
threaded inlet.
· Compatible with manifolded vent applications.
Vacuum
setting
US Model
6.2 to 14.9 mbar
EN Model
35 mbar maximum
CN Model
20 to 30 mbar
US Model
-14.9 to 24.9 mbar
EN Model
-2 mbar maximum
CN Model
-15 to -20 mbar
Pressure
leak rate
≤ .05 CFH at +
Vacuum
leak rate
≤ .21 CFH at -4" WC
Maximum
flow rate
8,000 SCFH at 2 PSI
Operating
temperature
-22° F to 122° F (-30° C to 50° C)
SERVICE STATION
HARDWARE
materials and premium internal components designed and
tested to last.
Pressure
setting
Materials
In-Line Vault
· The cast ductile iron enclosure houses the P/V vent for
added security and protection from the environment while
also placing it at grade-level for safer, cost-effective
maintenance and testing.
· The vault includes a UV-resistant vent cap with a stainless
steel mesh debris shield for the top of the vent stack.
· The stainless steel gasketed faceplate includes a swivel pin
that holds it in place during service.
· Tamper-resistant screws secure the faceplate to the vault.
· Eliminates wrenching at height.
· Integrated drain plug facilitates draining of condensate.
P/V vent body UV-resistant polymer
Seals
UL listed elastomers
Screens
Stainless steel
Vent (rain)
cap
UV-resistanct polymer
In-line vault
body
E-coated cast ductile iron
In-line vault
cover
Stainless steel
UL2583 listed
Approvals &
Certifications
Three models to meet the cracking
pressure requirements for regions following
the US, UK, and China standards
Flame Arrestor meets EN 16852
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