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{ :. Overfill-Prevention Valve OPW 61-SO The OPW 61-SO overfill prevention valve is designed to be a simple, low cost solution to the shut-off of product fill of underground storage tanks.The shut-off valve is an integral part of the 4"drop tube used for submerged filling. No exten- sive or expensive excavation is required.The OPW 61-SO can easily be retrofit into most existing locations. No special manholes are required. Installing the OPW 61-SO is as simple as changing drop tubes. The OPW 61-SO is a tyro-stage shut-off valve.When liquid level rises to about 95%of tank capacity-the valve mechanism is released and the valve closes 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,disconnect and drain the delivery hose.As long as the liquid exceeds this level,the valve will close automatically each time delivery is attempted. If the storage tank is overfilled to an unsafe condition and the liquid rises to about 98%of tank capacity-the bypass valve closes.No additional liquid will flow into the tank until the level drops below a reset point. i Features: Advantages of Overfill Prevention ■ Simple,easy and quick installation-no excavation compared to Overfill Warning or special manholes required. Systems: • Economical-costs a fraction of expensive,compli- a Completely automatic operation,does not rely on the cated and difficult to install valves. alertness or speed of response of the delivery attendant m Completely automatic operation-no prechecks to -for certainty of overfill prevention. perform,no resets,no overrides to be broken or ■ Keeps the top of UST"dry"-eliminating possible leaks abused. from loose bung fittings and the need for double con- • Works at all flow rates-operates directly from liquid tainment on vent lines. level. ■ Does not rely on pressure in the UST to stop flow- ■ Will accept a dipstick for gauging. allowing faster hose drain times and reducing spill risk. ■ Retrofits directly-for existing tanks and 4"riser pipes. ■ The hose"kick"that accompanies the valve shut-off provides a clear signal that the tank is overfilled- ® Automatic hose drain-for operator convenience. speeds delivery operations. ■ Installation in a coaxial fill application is simple and inexpensive, no additional excavation or vent piping is required(see p. 19,Coaxial Stage 1). Two Point Fin Coaxial Fill NEW Application Application C The OPW 61-SO series is available The OPW 61-SO series is also in two sizes for two point fill,separate available for coaxial fill,single product and vqWr_connections, product/vapor connections,applica- applications.The OPW 61-SO tions.The OPW 61-SOC series replaces the standard tight fill tube in valve replaces the standard coaxial the 4"tank riser pipe. tight fill drop tube in the 4"tank riser pipe. See page 21 for complete specifying and ordering information. 20