35
11.
Remove the old disc from the valve body.
12.
Clean and inspect all components for damage and/or excessive wear. Replace those compo-
nents beyond repair.
13.
Install a new O-ring into the groove on the valve disc stem. Apply a light coat of Super Lube®
Multi-Purpose Synthetic Grease Food Grade with Silicone or equal to the stem, O-ring and piv-
oting surfaces of the new disc.
14.
Install the new disc into the valve body by inserting the stem end first. The disc must be
slightly rotated for the stem to clear the bore. With the disc now positioned in the fully open
position, push the trunnion end of the disc into position. This will take some force to get disc
into position; however, well lubricated pivot points greatly help.
15.
Once disc is in place, roughly center both the stem and trunnion ends in their respective valve
body bores.
16.
Apply a light coat of Super Lube® Multi-Purpose Synthetic Grease Food Grade with Silicone or
equal to the stem and gearbox adapter pilot bore, as well as, the bore for the trunnion pin.
17.
Place a new O-ring on the trunnion. Apply a light coat of Super Lube® Multi-Purpose Synthetic
Grease Food Grade with Silicone or equal to the O-ring and pin diameter. Apply Loctite® #243
or equal to the threads on the trunnion. Insert the trunnion into the valve body and tighten
using a 1-½ inch socket wrench. Torque the trunnion to 120 lb-ft (163 N-m).
18.
Place a new O-ring into the groove on the gearbox adapter. Apply a light coat of Super Lube®
Multi-Purpose Synthetic Grease Food Grade with Silicone or equal to the O-ring and pilot di-
ameter, as well as the bore in the gearbox adapter. Install the gearbox adapter into the valve
body. Reinstall the two 7/16-14 x 1 inch long counterbore screws, but do not completely
tighten.
19.
If switches need to be replaced refer to instructions on SWITCH REPLACEMENT.
20.
Install a new gasket to gearbox adapter.
21.
Rotate the valve disc to its half open position. Apply a light coat of Sunoco® Ultra® Prestige®
2EP grease or equal to the valve shaft. Insert the shaft into the gearbox adapter making sure
that the slot in the end of the shaft lines up with the tang on the end of the valve disc stem.
On MIV-E type valves install the thrust washer over the square end of the shaft. Lightly grease
the top surface of the thrust washer.
22.
Reinstall the gearbox onto the gearbox adapter by lining up square end of shaft with square
bore in gearbox.
23.
Apply Loctite® #243 or equal to four 3/8-16 x 2-½ inch long cap screws. Tighten cap screws.
24.
Apply a light coat of Super Lube® Multi-Purpose Synthetic Grease Food Grade with Silicone or
equal to the valve bore and the disc edges.
25.
Install valve and suction tube on the fire pump. Apply a coat of Loctite® #243 or equal to
threads of cap screws and nuts before installing. Torque cap screws and nuts to 40 lb-ft (54 N-
m).
26.
Connect electrical wires.
27.
Operate the valve to the closed position
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