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- OPW 61SO OVERFILL PREVENTION VALVES The DPW 61SO Overfill Prevention Valve is designed to prevent the overfill of underground w' storage tanks by providing a positive shut-off of product delivery.The shut-off valve is an integral part of the drop tube used for gravity filling.The DPW 61SO allows easy installation(without breaking concrete)and requires no special manholes. The DPW 61 SO is a two-stage shut-off valve.When the liquid level rises to about 95%of tank capacity,the valve mechanism is released,closing 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 and disconnect and drain the delivery hose.As long as the liquid exceeds the 95%level, the valve will close automatically each time delivery is attempted. If the delivery is not stopped and the liquid rises to about 98%of tank capacity,the bypass valve closes completely. No additional liquid can flow into the tank until the level drops below a reset point. Models of the 61 SO are available to meet virtually any UST application including two-point, coaxial, poppeted coaxial and remote fill.The 61SO-3000 provides two-point overfill protection for 3"riser pipes,and the 61 SO-1000 and 61SO-100C(CARB)feature a grooved-tube design for use with tank gauging systems. Methanol and CARB(vapor-tight)approved models are also available. The DPW 61 SO is approved by the New York City Fire Department.(Approval#4902) • IMPORTANT In order to prevent product spillage from the Underground Storage Tank(UST),properly maintained delivery equipment and a proper connection at the fight-fill adaptor are essential. Delivery personnel should be managed and trained to inspect delivery elbows and hoses for damaged and missing parts.They should always make certain there is a positive connection between the adaptor and elbow. If delivery equipment is not property maintained,or the elbow is not securely coupled to the adaptor,a serious spill may result when the DPW 61SO closes, causing a hazard and environmental contamination. NOTE: The DPW 61SO is designed for use on tight-fill gravity drop applications only. Do not use for pressure fill applications. Features: ♦Simple, Easy and Quick Installation- ♦ No Pressurization of The Tank- Certifications NY City Fire ' No excavation or special manholes Operates directly from liquid level. and Listings CARB Department required. ♦Will Accept a Dipstick for Gauging. 61SO Series Initial Approval ♦Economical-Costs a fraction of ♦ Retrofits Directly For both new and Certification #4902 expensive,complicated and difficult existing tanks with 3"or 4"fill risers. Letter Oct 88 to install valves. ♦Quick Drain Feature-Automatically updated approval ♦ Furnished Complete-Supplied with drains hose when head pressure is Loner#97.04 new upper and lower drop tubes, relieved. 61SOM Approval mounting hardware and thorough gest Flow Rate in The IndustUtter#90-5 ry.• _ instructions for quick job site time. 61sop Approval ♦Completely Automatic Operation-No Letter#92-8 prechecks to perform,no resets,and no "Test witnessed by Bowser-Momen Inc.,an overrides to be broken or abused. independent laboratory.Results available upon request. Advantages of Overfill Prevention Materials Compared to Overfill Warning Systems: Valve body: cast aluminum ♦Completely Automatic Operation- ♦Speeds Delivery Operations- Float: nitrile rubber, closed cell foam Does not rely on the alertness or speed Product flows unimpeded into the tank Valve:aluminum of response of the delivery attendant, until the hose"kick"that accompanies Seals:viton for certainty of overfill prevention. the valve shut-off provides a clear Upper&lower Drop Tube: aluminum ♦Keeps the Top of UST"Dry,"per signal that the liquid has reached the Plastic parts:acetal EPA Requirements-Eliminating shut-off level. Hardware:stainless steel possible leaks at loose bung fittings ♦Simple and Inexpensive Installation- and the need for double containment In both two-point and coaxial fill on vent lines. applications,no additional excavation, ♦Does Not Rely on Pressure in the manholes or vent piping are required. UST to Stop Flow-Allowing faster fill times and reducing spill risk.