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Specifications <br /> • Model : 70& 590 Series <br /> • Type : Class I Automatic Overfill Shutoff Device—Gravity Fill Only <br /> • Size : Fits through 4 " schedule 40 ( DN 100 ) pipe <br /> • Flow rate : 25 - 370 GPM ( 94 - 1400 LPM ) <br /> • Static pressure rating : 10 PSI ( 0 . 7 bar ) MAX <br /> • Compatibility : Liquid petroleum fuel blends ( EO - E85 , 130- 1320 ) <br /> Valve operation <br /> The Franklin Fueling Systems ( FFS ) model 708 - 590 Series Overfill Prevention Valve ( OPV ) is <br /> designed with a primary shutoff that activates between 85 and 92 % of tank volume, depending <br /> on the tank diameter. When the primary shut- off is actuated , the flow through the OPV is limited <br /> to less than 8 GPM ( 30 LPM ) . A secondary, positive shutoff happens at 95 % tank volume if you <br /> continue filling . After primary shutoff, you can still drain the delivery hose, but you must be <br /> extremely careful and follow these steps : <br /> 1 . Close the truck bottom loading valve . <br /> 2 . Wait 5 minutes <br /> 3 . Partially open the coupler between the delivery hose and the bottom loading valve and <br /> allow the hose to drain . <br /> NOTE : Shutoff points are affected by the specific gravity of the stored liquids . These instructions <br /> are based on the average performance of all products . The OPV was designed to be only an <br /> emergency overfill prevention device . <br /> NOTE : Determine if the underground storage tank has a ball float vent valve . If it does , make sure <br /> the nipple portion does not extend more than 3 " ( 76 . 2 mm ) into the tank . <br /> 03 <br />