UL Catalog 2024-2025 - Flipbook - Page 151
DEFENDER SERIES®
PRESSURE / VACUUM
VENT WITH IN-LINE VAULT
HIGHLIGHTS
SERVICE STATION
HARDWARE
Defender Series® Pressure/Vacuum (P/V) vents regulate the pressure
at which vapor 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.
SPECIFICATIONS
Pressure / Vacuum Vent
Pressure setting
2.5" to 6.0" WC
• The P/V vent is constructed of high-grade, UV-resistant
materials and premium internal components designed
and tested to last.
Vacuum setting
-6.0" to -10.0" WC
Pressure leak rate
≤ 0.05 CFH at +2" WC
Vacuum leak rate
≤ 0.21 CFH at -4" WC
• A vent cap with stainless steel mesh debris shield protects
the system from water and insect intrusion.
Maximum
flow rate
8000 SCFH at 2 PSI
• The one-turn locking mechanism provides easy installation
and removal for servicing.
Operating
temperature
22° F at 122° F (-30° C at 50° C)
• High tolerance for over-pressure situations.
P/V vent body
UV-resistant polymer
Seals
UL Listed elastomers
Screens
Stainless steel
Rain cap
UV-resistant polymer
In-line vault body
E-coated cast ductile iron
In-line vault cover
Stainless Steel
Approvals/
Certifications
- UL2583 listed
- CARB Enhanced Vapor Recovery (EVR)
certified under Executive Orders VR-101,
VR-102, VR-104, and VR-105
- Meets the requirements of EPA 40 CFR part
63 for Gasoline Dispensing Facilities
• Designed to meet all major motor fuel types.
• A rolling diaphragm achieves low leak rates and high flow
rates with a tight and consistent seal.
• The internal female threads are compatible with OPW®
vent stack adapters for easy retrofit onto existing sites.
• Compatible with manifolded vent applications.
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 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.
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