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Frarlkll Il 'tne,G n5- UQ 1' Se4fs yfS <br /> Maintenance Inspecting/Verifying 95% Level (Without <br /> The 708-590 Series Overfill Prevention Valve has no Removing from Tank) <br /> periodic maintenance requirements. FOR DIMENSIONS"A" &"B": Refer to the"installation <br /> However, if the drop tube and valve assembly is removed record sheet"or re-measure and re-calculate per figure 1. <br /> from the tank (for inspection or service), inspect the <br /> drop tube seal for wear/damage (Figure 16). Replace if 1. Measure Dimension "Z' (Figure 18) <br /> necessary. <br /> (Upper drop tube Flange to <br /> - � <.Z., edge of upper tube adapter) <br /> 2. Verify using the calculation below <br /> (Drop tube seal surface to <br /> bottom of tank) <br /> (Subtract) <br /> Drop Tube Gasket Installed „B„ (95%Volume from tank chart) <br /> (note orientation) <br /> (Subtract) <br /> 4.5" (114mm) (95%Shutoff level offset) <br /> Figure 16:Inspect Gasket <br /> Additionally, if the upper or lower drop tube is = (Equals) <br /> unthreaded/removed from the OPV,the O-ring(s)should <br /> be replaced (Figure 17). Same value as "Z" <br /> indicates correct installation <br /> Inspect O-ring <br /> Measure <br /> ,2„ <br /> QN41/2" <br /> (114 mm) <br /> Inspect O-ring <br /> Figure 17:Inpect O-Rings Figure 18:Dimension Verification After Installation <br /> 9 <br />