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IMPORTANT: OPW products should be used in compliance with applicable federal, state, provincial, and local <br />laws and regulations. Product selection should be based on physical specifications and limitations and <br />compatibility with the environment and materials to be handled. OPW MAKES NO WARRANTY OF <br />FITNESS FOR A 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 make changes at any <br />time in prices, materials, specifications and models and to discontinue models without notice or obligation. <br />C:> P W <br />61SO Series Overfill Prevention Valves (61SO-3000 61SO-1000 61SO-100C 61SO-4000 61SO-4010 61SO- <br />400C-EVR 61SO-41OC-EVR 61SO 42OC-EVR 61JSK4400-EVR 61SO-490161SO-490C 61SOM4121 <br />61SOM412C-EVR 61SOR 61SO-4BYT 61SOC-4BYT 61JSK 4RMT 61SOC-400161SOC401161SOP- <br />4002 61SOP-4012 61SOCM-4000 61SOR4000 61SORM-4000) <br />Jul <br />�]"_j <br />The OPW 61 SO Overfill Prevention Valve is designed to prevent the overfill of underground storage tanks by <br />providing a positive shut-off of product delivery. The shut-off valve is an integral part of the drop tube used for <br />gravity filling. The OPW 61 SO allows easy installation (without breaking concrete) and requires no special <br />manholes. <br />The OPW 61 SO is a two-stage shut-off valve. When the liquid level rises to about 95% of tank capacity, the <br />valve mechanism is released, closing automatically with the flow. This reduces the flow rate to approximately 5 <br />gpm through a bypass valve. The operator may then stop the filling process and disconnect and drain the <br />delivery hose. As long as the liquid exceeds the 95% level, the valve will close automatically each time delivery <br />is attempted. <br />If the delivery is not stopped and the liquid rises to about 98% of tank capacity, the bypass valve closes <br />completely. No additional liquid can flow into the tank until the level drops below a reset point. Models of the <br />61 SO are available to meet virtually any UST application including two-point, coaxial, poppeted coaxial and <br />remote fill. The 61 SO -3000 provides two-point overfill protection for 3" riser pipes, and the 61 SO -1000 and <br />61SO-100C (CARB) feature a grooved -tube design for use with tank izauRiniz systems. Methanol and CARB <br />