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Fratklin F��e.u�n5- 0�r)dar Seri -es <br />Maintenance <br />The 708-590 Series Overfill Prevention Valve has no <br />periodic maintenance requirements. <br />However, if the drop tube and valve assembly is removed <br />from the tank (for inspection or service). inspect the <br />drop tube seal for wearldamage (Figure 1E). Replace if <br />necessary. <br />Figure 16: Inspect Gasket <br />Additionally, if the upper or lower drop tube is <br />unthreaded /removed from the OPV, the O-ring(s) should <br />be replaced (Figure 17). <br />Inspect 0 -ring <br />Inspect <br />Figure IT, Inpect O -Rings <br />Inspecting/Verifying 95% Level (Without <br />Removing from Tank) <br />FOR DIMENSIONS "A" & "B": Refer to the "installation <br />record sheet" or re -measure and re -calculate per figure 1. <br />1. Measure Dimension "T' (Figure 18) <br />(Upper drop tube flange to <br />edge of upper tube adapter) <br />2. Verify using the calculation below <br />(Drop tube seal surface to <br />'LAP' <br />i1 bottom of tank) <br />- (Subtract) <br />"B„ (95% Volume from tank chart) <br />- (Subtract) <br />4.5" (114mm) (95% shutoff level offset) <br />_ (Equals) <br />Measure <br />ITS <br />4,/„ <br />z <br />(114 mm) <br />Same value as 'T' <br />indicates correct installation <br />Figure ?8: Dimension Verification After Installation <br />M <br />