Universal Valve Installation Instruction
Model 47-20 Overfill Protection Valve
FOR DAY TANK
UNIVERSAL VALVE COMPANY, INC. 478 SCHILLER ST. ELIZABETH, NJ 07206 (rev 4-15pm)
The model valve 47-20 is pre-assembled for installation with a 12” x ¼-20 threaded rod.
Fig 1
Pre-determined
length
L
The threaded rod should be cut to determine a Length L as shown in Figure 1. This
length L will determine the fill capacity for shut off as specified by the tank specification
manual for 90% or 95% capacity.
1. Measure the height H from the bottom of the tank as shown
if Figure 2.
2. Determine whether a 90% or 95% capacity fill is require,
and refer to the tank specification manual to locate the
height of 90% or 95% capacity fill as shown in Figure 3.
Figure 2 Tank Height Dimension
Figure 3 Height C for fill Capacity
Figure 4 Calculating values for “Y” and “X”
3. Subtract 4.5” and the height “C” from the height “H” to determine a distance “Y”
as shown in Figure 4. ( H - C - 4.5” )
4. Divide the value obtained for “Y” by .866 to determine the distance “X” also
shown in Figure 4.
5. To determine the Length L, add the square of “Y” ( Y * Y) and the square of “X”
Figure 5 Length
of Rod to be Cut
Figure 6 Marked
Line showing
Direction of
Float
( X * X ) and take the square root of the sum.
6. The threaded rod will screw into the poppet cam to a depth
of ¼”. Add ¼” to the length L previously calculated to
determine the total length for cut.
7. Apply thread sealant to ¼” at the end of the rod to be screw
onto the poppet cam. Screw on the float rod into the poppet
cam ¼”. Do not over thread. When installed properly the
float rod should swing back and forth freely.
8. Apply pipe dope to NPT thread and install the valve with the float
hanging in the vertical position.
9. Note: There is a marked line on the valve as shown in Fig 6 to
indication the direction of swing for the float. Be sure to install so
that there is no obstruction to the swing of the float. The float will
swing to the right or left of the marked line for shut off.
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