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The OPW 61 SO is a two-stage shut-off valve. When the liquid level rises to about 95% of tank <br /> capacity, the valve mechanism is released, closing automatically with the flow. This reduces the flow <br /> rate to approximately 5 gpm through a bypass valve. The operator may then stop the filling process <br /> and disconnect and drain the delivery hose. As long as the liquid exceeds the 95% level, the valve <br /> will close automatically each time delivery is attempted. <br /> If the delivery is not stopped and the liquid rises to about 98% of tank capacity, the bypass valve <br /> closes completely. No additional liquid can flow into the tank until the level drops below a reset point. <br /> Models of the 61 SO are available to meet virtually any UST application including two-point, coaxial, <br /> poppeted coaxial and remote fill. The 61 SO-3000 provides two-point overfill protection for 3" riser <br /> pipes, and the 61 SO-1000 and 61 SO-100C (GARB) feature a grooved-tube design for use with tank <br /> gauging systems. Methanol and CARB (vapor-tight) approved models are also available. The OPW <br /> 61 SO is approved by the New York City Fire Department. (Approval #4902) <br /> Table of Contents: <br /> 1. Features & Advantages <br /> 2. Materials <br /> 3. Certifications and Listings <br /> 4. 61 SOR Remote Fill <br /> 5. 61 SO Vapor-Tight Remote Fill <br /> 6. OPW Overfill Prevention - EVR <br /> 7. 61 SO Two-Point <br /> 8. 61 SOC Coaxial <br /> 9. 61 SOP Poppeted Coaxial <br /> 10. 61 SO-4BYT <br /> 11. Ordering Specifications <br /> 12. Replacement Parts <br /> 13. Additional Resources <br />