RESILIENT-SEATED CARTRIDGE STYLE
FNW7XX
BUTTERFLY VALVE
INSTALLATION INSTRUCTIONS
FNW.COM
We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
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16. BUTTERFLY VALVE ASSEMBLY
1. Insert the seat into the body, making sure the
holes in the seat align with the stem holes in
the body. Improper alignment can cause seat
tears when stems are inserted.
2. Insert bushing(s) into the lower stem hole.
Check the valves bill of materials for correct
quality and type of bushings.
3. With lubricant, insert the lower stem into the
body. Push the stem so that just the tip comes
through the seat.
4. Insert the bottom of the disc into the seat
over the lower stem. With the disc in the
partially open position, push or tap the top of
the disc to align with the upper stem hole.
5. Insert the lower stem into the disc by pushing
the valve body and disc assembly down onto
the stem. Then tap the lower stem further in
beneath the internal threads in the body.
6. Insert bushings(s) into the upper stem hole,
Note that 14" and larger valves have a long
bushing that should be installed first.
7. Insert o-ring packing. Note that on 14" and
larger valves, the o-ring is installed between
the upper two bushings.
8. With lubricant, insert the upper stem almost all
the way into the body. Make sure the stem flats
are aligned with the receiving hole in the disc.
9. If necessary, drive the upper stem into the
disc with a rubber mallet. If there is much
resistance, make sure the stem flats are aligned
appropriately to the disc.
10. Slide the retaining plate onto the groove
located just below the square drive of the stem.
Align the screw holes with the holes in the
body’s top flange.
11. With a rubber mallet, tap the upper stem
the remainder of the way into the stem. Secure
the retainer plate with flat head counter-sunk
screws.
12. Insert the lower stem plug by first applying
pipe-dope. Loctite® or an equivalent product to
secure the plug.