UL Catalog 2022-2023 - Flipbook - Page 152
DEFENDER SERIES®
PRESSURE / VACUUM
VENT WITH IN-LINE VAULT
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.
HIGHLIGHTS
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
• 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.
• Vacuum leak rate: ≤ .21 CFH at -4" WC
• Maximum flow rate: 8,000 SCFH at 2 PSI
• Operating temperature: -22° to 122° F (-30° to 50° C)
• High tolerance for over-pressure situations.
Materials
• Compatible with all fuel types.
• P/V vent body: UV-resistant polymer
• A rolling diaphragm achieves low leak rates and high flow
rates with a tight and consistent seal.
• Seals: UL Listed elastomers
• Includes 2" NPT vent stack adapter.
• Rain cap: UV-resistant polymer
• The internal female threads are compatible with OPW® vent
stack adapters for easy retrofit onto existing sites.
• In-line vault body: E-coated cast ductile iron
• 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 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.
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• Pressure leak rate: ≤ .05 CFH at +2" WC
• Screens: Stainless steel
• In-line vault cover: Stainless steel
Approvals/Certifications
• UL2583 listed.
• Meets the requirements of EPA 40 CFR part 63 for Gasoline
Dispensing Facilities