Overfill Prevention Valve
Defender Series®
Overfill Prevention Valve
The Defender Series® Overfill Prevention Valve (OPV) prevents the overfill of an underground storage tank during a gravity-fed product delivery. It employs a revolutionary magnetically-coupled actuator system to provide positive shutoff. This unique method of shutoff eliminates any penetrations in the valve, making it both vapor and leak tight. This also allows for remote compliance testing of the primary functionality at grade level without having to remove the OPV from the tank.
NEXT-LEVEL OVERFILL PREVENTION
The Defender Series® OPV provides safe, rapid, and reliable fuel drops with simple installation, service, and remote testing capability. The secret to this game changer is its revolutionary magnetically-coupled actuator system. The design allows positive shutoff without a single penetration in the valve body, meaning no leak or vapor paths.
Easy UST Regulation Compliance
Unlike other OPVs, the Defender Series does not have to be pulled out of the UST to conduct the mandatory 95% tank volume shutoff confirmation test every three years. That’s hassle-free compliance with no risk of damaging your equipment or extended shutdowns.
Remote Testing
The magnetically-coupled actuator system along with a testing tool allows for primary functionality testing of the OPV at grade level without having to remove the entire assembly from the riser.
Simple Installation
There’s no flaring, riveting, or messy epoxying of drop tubes on site. The Defender Series. OPV utilizes an error proof roll crimp-and-thread installation method to achieve a fast and easy in-line installation.
TECHNICAL ADVANTAGES
REMOTE TESTING IN MINUTES
Fast visual inspection can be conducted by a single person in a matter of minutes. The magnetically-coupled actuator system along with the testing tool allows for primary functionality testing of the OPV without having to remove the entire assembly from the riser.
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Remote Testing ToolThe remote testing tool will actuate the flapper when inserted down the drop tube and slid by the actuator – this is confirmed visually through a window in the tool. | Any Tank SizeTo accommodate varying tank sizes, the testing tool handle is segmented into six sections for customization up to 11 feet (3.35 meters) in length. |
SIMPLIFIED INSTALLATION
Gone are the days flaring, riveting, and epoxying drop tubes on site. The Defender Series® OPV utilizes an error proof roll-crimp and thread installation method to achieve a perfectly in-line installation.
 | Top AdapterA special, double O-ring top adapter is used to attach the drop tube for easy installation without any drilling, riveting, epoxy or flaring tools. |
 | In-Line AssemblyA perfectly in-line assembly installs smoothly into the riser and can be easily removed for maintenance. |
 | Threaded ConnectionsWith threaded top and bottom drop tube installation, damaged drop tubes can easily be replaced without having to purchase an entirely new assembly. |
COMPLETELY VERSATILE
The Defender Series® represents our most versatile offering of OPVs to date with more approvals and capabilities per model as well as simpler ordering options.
Approvals
Each model is designed to meet all major approvals and global performance requirements.
Fuel Compatibility
Alcohol, gas, and biofuel (E-85, gasoline and biodiesel) compatible models come with hard coated anodized drop tubes for full compatibility.
Drop Applications
For use in direct and remote gravity drop applications with models for coaxial applications.
HIGH OR LOW FLOW
Minimal flow path obstructions accommodate high flow drops while the magnetically-coupled actuator system also provides reliable positive shutoff for low flow drops.
Flow Rates
The Defender Series® OPV accommodates a broad range of flow rates from 25 gpm to 370 gpm (95 lpm to 1,400 lpm).
High Flow
In high flow applications, the actuator system will hold the flapper in place, only releasing it into the flow of fuel once the float has risen to generate positive shutoff.
Low Flow
In low flow applications, the actuator system will assist by kicking the flapper out into the flow of fuel to generate positive shutoff.
Approvals/Certifications
- CARB certified, VR-101-U (FFS) and VR-102 (OPW®).
- ATEX 2014/34/EU approved.
- EN13616 certified.
- KIWA BRL-K636/03 certified.
- UL 2583 listed and ULc listed, MH21090.
- For all vapor control and liquid control products covered by UL 2583 automotive fuels, only those fuels formulated in accordance with 40CFR80, “Regulation of Fuels and Fuel Additives,” and meeting the following ASTM fuel specifications and blend limits:
- ASTM D975 diesel with or without biodiesel blends up to 5% (B5)
- ASTM D7467 diesel with biodiesel blends between 6% – 20% (B6 – B20)
- ASTM D4814 gasoline with ethanol blends up to 10% (E10)
- ASTM D4814 and ASTM D5798 mid-range ethanol/gasoline blends of (E11-50)
- ASTM D5798 high-range ethanol/gasoline blends (E51-83)-Commercially sold as E85
- Isobutanol Fuel Blends (max iBu16) of ASTM D4814 Gasoline (E0) and ASTM D7862 Butanol (2-methyl-1-propanol isomer)
- Alcohol, gas, biofuel compatible (E-85, gasoline and biodiesel) models come with hard coated anodized drop tubes for full compatibility.
Components
- Pre-flanged aluminum top drop tube
- Roll-crimped top fitting/drop tube
- Protective float sleeve
- Float (shielded by float sleeve)
- Valve Assembly
- Magnetically-coupled actuator
- Threaded bottom drop tube
Dimensions
Operation
The OPV is designed with a primary shutoff that will activate between 85% and 92% of tank volume, depending on tank diameter. After the primary shutoff is actuated the flow through the valve is limited to less than 30 lpm 8 gpm (30 lpm). A secondary positive shutoff will occur at 95% tank volume if filling continues. As the liquid level in the UST approaches 95% capacity, the liquid level raises the float. As the float rises it actuates the external/internal magnetic couplers which release the flapper to be closed by the flow of product. As the float continues to rise, the internal mechanism pushes the flapper further into the product flow to allow actuation at high or low flow rates. This sudden reduction in flow caused by the primary flapper closing creates “line shock” to the fill hose which signals the delivery driver that the tank is nearing 95% capacity. As the float continues to rise to the 95% fill level, the secondary closes, completely stopping the flow of fuel.
