Defender Series® Overfill Prevention Valve with 5' Top & 8' Bottom Drop Tubes
Next-generation overfill protection for underground storage tanks. The Defender Series® OPV prevents overfill during gravity-fed fuel deliveries using a magnetically-coupled actuator system for a leak-tight and vapor-tight shutoff. This unique design eliminates penetrations in the valve body, allowing remote compliance testing at grade level without removing the valve from the tank.
Key Features
- Advanced Magnetic Shutoff: Vapor-tight design prevents leaks and allows remote testing
- Remote Testing Capability: Test valve shutoff functionality at grade using a dedicated tool
- Simple Installation: Error-proof roll-crimp and threaded assembly—no epoxy, flaring, or riveting required
- Versatile Compatibility: Suitable for E85, gasoline, diesel, biodiesel (up to B100), and other ASTM-compliant fuels
- Flexible Flow Handling: Supports high (up to 370 GPM) and low flow rates with reliable shutoff
- Integrated 5’ Top + 8’ Bottom Drop Tubes: Threaded design allows easy field servicing or replacement
- Multi-stage Shutoff: Primary shutoff at 85–92% tank volume; secondary shutoff at 95% to ensure compliance
- No Leak Paths: Entire valve body is sealed—eliminating vapor emissions and fluid leaks
Remote Testing System
- Testing Tool: Enables single-operator visual inspection from grade level
- Modular Handle: Adjustable in six segments, up to 11 ft (3.35 m), for various tank sizes
- Visual Confirmation: Tool window shows actuator engagement with internal flapper
Technical Specifications
- Flow Rate Range: 25 – 370 GPM (95 – 1400 LPM)
- Primary Shutoff Activation: 85% – 92% tank volume
- Secondary Shutoff: 95% tank volume (complete closure)
- Drop Tube Lengths: Top: 5 ft (1524 mm), Bottom: 8 ft (2438 mm)
- Construction: Hard-coated anodized aluminum tubes (for fuel compatibility)
Compliance & Certifications
- CARB Certified: VR-101-U (FFS), VR-102 (OPW®)
- ATEX 2014/34/EU Approved
- EN13616 & KIWA BRL-K636/03 Certified
- UL 2583 & ULc Listed (MH21090)
- Meets ASTM D975, D7467, D4814, D5798 fuel specs
Fuel Compatibility
- Gasoline with up to 10% ethanol (E10)
- Ethanol blends up to E85
- Diesel with biodiesel blends up to B100
- Isobutanol blends (max iBu16)
- All ASTM biofuel standards supported
The Defender Series® OPV is the industry’s most advanced solution for overfill prevention—combining regulatory compliance, high-performance operation, and unmatched ease of testing and installation.