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�Wff) Fiwlw5- OeAo&r ifs � <br /> wG � 1ocD LQu0rZ. 8� <br /> Maintenance Inspecting/Verifying 55% 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 /> :,Z„ (Upper drop tube flange to <br /> 57 <br /> edge of upper tube adapter) <br /> 2. Vgrify using the calculation below <br /> 159 (Drop tube seal surface to <br /> bottom of tank) <br /> -(Subtract) <br /> Drop Tube Gasket installed <br /> (note orientation) "B � (95%Volume from lank chart) <br /> r Z <br /> I l.� <br /> (Subtract) <br /> „ 95%Shutoff level offset <br /> 4.5 (114mm) { ) <br /> Figure 1S:Inspect Gasket <br /> _ <br /> Additionally, if the upper or lower drop tube is (Equals) <br /> unthreaded I removed from the OPV,the O-ring(s)should - <br /> — <br /> be replaced (Figure 17). t Same value as "Z" <br /> indicates correct installation <br /> Inspect 0-ring—► _, <br /> J <br /> i <br /> Measure <br /> f <br /> (114 mm) <br /> t, <br /> Inspect O-ring- a► .-_ j t l <br /> Figure 17:Inpect O l?ings Figure 18:Dimension Verification After Installation <br />