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Federal EPA technical standards for overfill pre- may take actions to stop the delivery process. <br /> vention of petroleum UST's allow the use of ball The EPA requirements are that this flow restriction <br /> float vent valves that restrict the delivery flow must occur when the tank is no more than 90%full. <br /> when the UST is overfilled. <br /> This flow restriction is a means of alerting the The OPW 53VML series is designed to con- <br /> sistently and dramatically reduce delivery flow <br /> transfer operator,or delivery attendant so that he rate to 31/2-5 gallons per minute. <br /> Grade level <br /> p00. : o Q <br /> .-.flA1.��.fi��.�:,'�;fil •.� iy:• .. �h(;r::^'a, rY•,�Lfi.. <br /> it ti.•,�... <br /> IllIil I'.i"!ln <br /> Iii !iCf <br /> j <br /> I,'. t l f <br /> US I <br /> Figure 1 10-o of total <br /> r talll; capacity P <br /> Appropriate for '', "cc.libr .t� i l determined from <br /> OPW fittings only! vent orifice appropriate tan! <br /> chart <br />