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Aug 04 04 11:59a RH Design Group [92 13-9709 p.2 <br />IMPORTANT: OPW products should be used in compliance with applicable federal, <br />state, provincial, and local laws and regulations. Product selection should be based on <br />physical specifications and limitations and compatibility with the environment and <br />materials to be handled. OPW MARES NO WARRANTY OF FITNESS FOR A <br />PARTICULAR USE. All illustrations and specifications in this literature are based on the <br />latest product information available at the time of publication. OPW reserves the right to <br />make changes at any time in prices, materials, specifications and models and to <br />discontinue models without notice or obligation. <br />61SO Series Overfill Prevention Valves (61SO-3000 61SO-1000 61SO-100C 61SO- <br />4000 61SO-4010 61SO-4000-EVR 61SO-41OC-EVR 61SO 42OC-EVR 61JSK4400- <br />EVR 61SO-4901 61SO-490C 61SOM-412161SOM412C-EVR 61SOR 61SO-4BYT <br />61SOC4BYT 61JSK4RMT 61SOC400161SOC401161SOP4002 61SOP-4012 <br />61SOCM4000 61SOR4000 61SORM4000) <br />The OPW 61SO Overfill Prevention Valve is designed to prevent the overfill of <br />underground storage tanks by providing a positive shut-off of product delivery. The shut- <br />off valve is an integral part of the drop tube used for gravity filling. The OPW 61 SO <br />allows easy installation (without breaking concrete) and requires no special manholes. <br />The OPW 61SO is a two-stage shut-off valve. When the liquid level rises to about 95% <br />of tank capacity, the valve mechanism is released, closing automatically with the flow. <br />This reduces the flow rate to approximately 5 gpm through a bypass valve. The operator <br />may then stop the filling process and disconnect and drain the delivery hose. As long as <br />the liquid exceeds the 95% level, the valve will close automatically each time delivery is <br />attempted. <br />If the delivery is not stooped and the liquid rises to about 95% of tank capacity, the <br />