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FvwAw�- Oe-�,f*r Sellfs <br /> WC�VWAC-t C�C,5 <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 (Upper drop tube flange to <br /> edge of upper tube adapter) <br /> 2. Verify using the calculation below <br /> eat surface if.) <br /> (Drop tube s <br /> bottom of tank) <br /> (Subtract) <br /> Drop Tube Gasket Installed "B" (95%Volume from tank chart) <br /> (note orientation) <br /> (Subtract) <br /> (95%Shutoff level offset) <br /> ...... (1 1 4mm) <br /> Figure 16:Inspect Gasket (Equals) <br /> Additionally, if the upper or lower drop tube is <br /> unthreaded;removed from the OPV,the O-ring(s)should D <br /> be replaced (Figure 17), 7Same value as 'T' <br /> indicates correct installation <br /> Inspect 0-ring <br /> ---------- <br /> Measure <br /> j <br /> 4112, <br /> (114 mm) <br /> Inspect 0-ring <br /> Figure 17:inpect O-Rings Figure 18:Dimension Verification After Installation <br />