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OPW 53VML 310FBALL FLOAT V T VALVES Federal EPA Technical Standards Federal EPA technical standards for overfill prevention of petroleum UST's allow the use of ball float vent valves that restrict the delivery flow when the UST is over- filled.The EPA requirements state that this flow restriction must occur when the tank is no more than 90% full.The OPW 53VML series is designed to consistently and dramatically reduce delivery flow rate. (See OPW 30MV to comply with EPA standards for a 30 minute warning.) Important Installing the incorrect length OPW 53VML for your specific UST application may result in delivery flow restriction at liquid levels exceeding the 90% maximum established by EPA. Always consult the appropriate tank charts and determine the specifics of your UST installation to determine the appropriate length OPW 53VML.The illustration and instructions below are intended to serve as a guide in this determination. Existing Installation Grade Level (Tanks bUried or backfilled) ♦ Measure distance"I" from a reference point near grade level to the top of the extractor cage bar. ;:; ® a-o °` � Q a��''o- a•Reference OPW 104A•� Point ♦Using theappropriate wrench, �4 oa $ 'b. C] t3: ° :a o..' ao0o 4 remove the extractor cage and Manhole ors o ' o. o v g°c5R+p9 Q.4'Yi' Q;G�Q-.V OPW 1 ]pill• a o °o. °• • v� o existine float vent valve. Container '° `� °�' ° ° ° �'�' Q• °pO n °'4 i ♦Measure distance"II"'from the same ' ' d��01 ��, �°pi a •,•O• ( ! ON ` ''o. o reference point near grade level to P �o•'• g©o no:� °4 the inside diameter or the UST. Or, °0-0 ' c' . �?a�;° Seo 0- ° �.� ;OPW 1611 AV po °'; .!op d Qo using a dipstick,determine the o d �Oq- ° 4 °' O ° •O .� ° return tilting distance from the reference point to :�P�fc::o r•sr s �:'- .-o�; ©.a o, phi�oCJ:q. .,pOo o' the bottom of the UST, and subtract OPW 233V or 233VM Vapor Y =`?• ° ..b.':oo�.' the tank inside diameter. recovery/extractor fitting z;°_a -O .•Qo•�_Cs,• o= a•Qtr�; o From the correct tank chart, ; ; ;d .'=4.=: _°aQ_e determine the distance"IV"that S 4"Tank"Bun ?i Fain corresponds to 10% of the total UST g • capacity. t7• o. Op. o °�.�o. a A; 00 •OPW 53VML length(V )—U+IV- °'_:r ` - -a: �o•,o: I- : 11ST?,.n• °�10%of total A lank capacity j New Installation %"vapor 1V as determined orifice from appro- (Tanks not buried) priate tank ♦ Follow the same procedure above or char measure and calculate dimension"V" from the inside diameter of the UST to the end of a 2" npt.pipe threaded into the extractor cage.The nominal l tight engagement of 2" pipe threads is X". IMPORTANT:OPW products should be used in com- ♦OPW 53VML length(VI)=IV+V pliance with applicable federal,state and local laws and regulations.Product selection should be based on physical specifications and limitations and compatibil- I Technical Votes ity with the environment and material to be handled. OPW MAKES NO WARRANTY OF FITNESS FOR ♦For extended manway applications. A PARTICULAR USE.All-illustrations and specifica- the total length of coupling and pipe tions in this literature are based on the latest product extension far the OPW 53VML information available at the time of publication.Dover/ OPW reserves the right to make changes at any time in should match the length of the prices,materials.specifications and models and to dis- manway extender. continue models without notice or obligation.