The Defender Series® overfill prevention valve (OPV) is a self contained two-stage positive shut-off valve that prevents the overfill of an underground storage tank (UST) during a gravity-fed product deliver. The valve 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. It provides safe, rapid, and reliable fuel drops for the broadest range of fuel applications and environmental conditions. Simple to install, service and test remotely, the Defender Series® OPV is the industry's most versatile overfill prevention valve.
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 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.
Features
- Magnetic coupler actuates the interior primary flapper assembly and secondary shut-off valve when the float rises outside of the valve, eliminating valve body penetrations and any potential product or vapor leak points
- After cutting to length in the field, the upper drop tube is roll-crimped onto a top adapter outfitted with two O-rings and then threaded onto the top of the valve body, eliminating the need for drilling, rivets, epoxy, and flaring tools
- Bottom drop tube is cut in the field and threaded onto the bottom of the valve ensuring straight installation
- The roll-crimp/thread method of installing drop tubes ensures proper alignment of the drop tubes with the rest of the OPV assembly, making installation and removal of the entire assembly smooth
- Damaged drop tubes can be easily replaced instead of having to purchase an entire new assembly
- Compatible with industry standard 4"" drop tubes allowing retrofit into existing installations
- The entire OPV assembly remains within the 4"" inner diameter of the riser preventing interference with other tank components and also allowing removal even while the tank is full
- Actuates in both low and high flow applications and functions within a broad range of flow rates from 25 gpm to 370 gpm (95 lpm to 1,400 lpm)
- The remote testing tool allows for remote testing of the primary functionality without having to remove the OPV from the riser
- Approvals & Certifications:
- UL 2583 listed and ULc listed, MH21090
- CARB certified, VR-101 (FFS) and VR-102 (OPW®)
- ATEX 2014/34/EU approved
- EN13616 certified
- KIWA BRL-K636/03 certified
