Flowserve V-370 R3 Edward Valves - Manual (Page 4)

EDWARD UNIVALVE USER INSTRUCTIONS ENGLISH 12-13
4
1. Double-check to make sure that line pressure has been
relieved before disassembling the valve.
2. The valve should be in the open position and not
against the body seat or backseat.
3. If the valve is manually operated, remove the lock
nut that attaches the handwheel or impactor handle
to the valve stem. Remove the handwheel or handle.
If the valve is motor operated, remove the actuator
from the valve stem.
4. Loosen the two gland adjustment screws that rest
against the packing gland by threading them higher
into the yoke. A hex allen wrench inserted into the top
of the gland screw thru the holes in the top of the yoke
(remove the dirt protectors first) will speed this up.
DISASSEMBLING THE UNIVALVE
Line pressure must be relieved before disassembling
the valve.
5. Loosen the yoke clamp bolt and nut. It is not necessary
to completely remove them.
6. Remove the yoke assembly by unscrewing it from
the bonnet. A gentle tap with a hammer might be
necessary before the yoke will unscrew away from
the bonnet. You may find it easier to remove the yoke
by placing the handwheel on the stem to prevent the
stem from rotating. When the yoke is even with the
top of the stem, and you can no longer use the valve
handwheel or handle, you will need to grasp the lower
portion of the stem between the yoke and bonnet. If
the yoke is turning freely, a cloth may be adequate to
hold the stem. If this is not adequate, a strap wrench
that will not damage the stem surface should be used.
If only the packing is to be replaced, this can now
be easily done with no further disassembly of the
Univalve. See Step 14.
7. If the yoke bushing is worn or damaged and must
be removed, insert 1 ⁄
8
” (or smaller) abrasive grinding
wheel into the slot on top of the bushing. Using a
standard grinding tool, work the grinder downward
to remove yoke metal that was upset into the bushing
during the valve assembly. Periodically during the
grinding process, try to turn the bushing within the
yoke to test how loose it is becoming. Once loosened,
use a screwdriver in the slot to turn the bushing. To
reinsert a new bushing, thread it into the yoke so that
the top of the bushing is flush with the top of the yoke.
Using a chisel and hammer, tap the yoke metal into the
bushing slot, creating an offset, so that the bushing is
tight within the yoke.