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61SO Series (6150-3000 61SO-1000 61SO-100C 61SO-4000 61.SO-4010 6150-400C- <br />EVR 61SO-41OC-EVR 61SO-42OC-EVR 61JSK-4400-EVR 61SO-4901 61SO-490C <br />61SOM-4121 61SOM412C-EVR 61SOR 61SO-4BYT 61SOC-4BYT 61JSK-4RMT <br />61SOC-4001 61SOC-4011 61SOP-4002 61SOP-4012 61SOCM-4000 61SOR-4000 <br />61 SORM-4000) <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 6ISO <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 stopped and the liquid rises to about 98% of tank capacity, the <br />bypass valve closes completely. No additional liquid can flow into the tank until the level <br />drops below a reset point. Models of the 61 SO are available to meet virtually any UST <br />application including two-point, coaxial, poppeted coaxial and remote fill. The 61SO- <br />3000 provides two-point overfill protection for 3" riser pipes, and the 61SO-1000 and <br />61SO-100C (CARB) feature a grooved -tube design for use with tank gauging systems. <br />Methanol and CARB (vapor -tight) approved models are also available. The OPW 61 SO <br />is approved by the New York City Fire Department. (Approval #4902) <br />