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The CARB-certed OPW 71 SO vapor -tight Overfill Prevention Valve is designed to prevent the overfill of underground storage tanks by providing a positive shut-off of product delivery. The shut-off valve is an integral part of the drop tube used for gravity filling. The OPW 71 SO allows easy installation (without breaking concrete) and requires no special manholes. The OPW 71 SO is a vapor -tight two- stage shut-off valve. When the liquid level rises to about 95% of tank capacity, the valve mechanism is released, closing automatically with the flow. This reduces the flow rate to approximately 5 gpm through a bypass valve. The operator may then stop the filling process and disconnect and drain the delivery hose, As long as the liquid exceeds the 95% level, the valve will close automatically each time delivery is attempted. If the delivery is not stopped and the liquid rises to about 98% of tank capacity, the bypass valve closes completely. No additional liquid can flow into the tank until the level drops below a reset point. NOTE: The 71 SO Overfill Prevention Valve can be adjusted to shutoff at any desired tank capacity. Please contact the Authority Having Jurisdiction (AHI) and review local, state, and national codes to determine the regulatory requirements governing shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. In all cases, the upper tube must protrude into the tank at least 6 1/2" to ensure that the valve can shut off flow into the tank completely before the top of the tank is wetted as per EPA requirements. 71 SO Instruction Sheet Order Number: H15524PA listings and C aterials JUN 1 9JUU7 Important g In order to prevent product Valve Body: Cast alumi rt VIRONMENTAL HEALTH spillage nd rage Ta k (UST}, p properly Float: Nitrile rubber, closed cejbRMIT/SERVICES maintained delivery equipment Valve: Aluminum and a proper connection at the tight -fill adaptor are essential. Seals: Viton® Delivery personnel should U er & lower Drop Tube: Aluminum to managed and trained pP p to inspect delivery elbows Plastic parts: Acetal and hoses for damaged and missing parts. They should Hardware: Stainless steel CAalways make certain there is a positive connection Features _ between the adaptor and elbow. If delivery equipment Simple, Easy and Quick °� is not properly maintained, Installation — no excavation or or the elbow is not securely coupled to the adaptor, a special manholes required, serious spill may result when Economical — costs a fraction the OPW 71 SO closes, causing a hazard and environmental of expensive, complicated and contamination, difficult -to -install valves. Furnished Complete — supplied 4 NOTE: The OPW 71 SO is with new upper and lower drop tubes, designed for use on tight-flll gravity drop applications only, mounting hardware and thorough Do not use for pressure instructions for quick job site time. fill applications. Completely Automatic Operation — no prechecks to perform, no resets and no overrides to be broken or abused. No Pressurization of the Tank — operates directly from liquid level. Retrofits Directly —for both new and existing tanks with 4" fill risers, Quick Drain Feature — automatically drains hose when head pressure is relieved. Will Accept a Dipstick Best Flow Rate in The Industry* for Gauging * OPW Test Lab results Advantages of Overfill Prevention Compared to Overfill Warning Systems: Completely Automatic faster fill times and reducing Operation —does not rely on th e alertness or speed of response of the delivery attendant for certainty of overfill prevention. Keeps the Top of UST "Dry," per EPA Requirements — eliminating possible leaks at loose bung fittings and the need for double containment on vent lines. Does Not Rely on Pressure in the UST to Stop Flow —allowing Al risk sp. Speeds Delivery Operations —product flaws unimpeded into the tank until the hose "kick" that accompanies the valve shut-off provides a clear signal that the liquid has reached the shut-off level. Simple and Inexpensive Installation — in both two-point and coaxial fill applications, no additional excavation, manholes or vent piping are required.