Flowserve 608 Series Ball Valve - Manual (Page 4)

SECTION 5.0 ASSEMBLY – 3-
PIECE VALVES
1. Place the stem washer on the stem with the
chamfered I.D. side to be against the blow-out
collar. Apply a light coat of silicone lubricant to the
stem washer and insert the stem through the body
into the stem bore.
NOTE: For valves having graphite stem
seal(s), care must be taken when installing the
graphite parts because they are easily
damaged by squeezing the O.D. of the seals.
Handle gently by holding seal(s) on flat
surfaces rather than on the O.D. If resistance
is encountered when installing seal(s) over the
stem, use follower to gently push the stem
seal(s) down.
2. Install the stem packing into the packing bore.
Be careful not to scratch the I.D. of the packing
rings on the threaded section of the stem.
3. Apply a light coat of silicone lubricant on the top
packing ring and then place the packing gland,
ground spring and spring washers, stem nut lock
plate and the stem nut on the stem. Finger
tighten the stem nut. Spring washers must be
oriented cup to cup.
4. Rotate the stem to align with the ball in the
closed position. Carefully install the ball into the
body. Gently rock the ball to make sure the stem
is centered in the ball slot.
5. Apply a light coat of silicone lubricant on the
ball side of the seat and place it into the seat
pocket of one tailpiece.
6. Place the body gasket into the machined
recess of the body and place the tailpiece
assembly on the body. Press firmly
and evenly on the tailpiece.
Refer to view AA for proper orientation of
metal “S” gasket
Valves with a pressure relief hole in the ball
(V3 option and chlorine valves) must be
assembled and installed with the hole
upstream when the valve is closed, to insure
that cavity relief is upstream. Any valve with a
relief hole will have an arrow on the body
pointing downstream. This arrow is stamped
on the body or on a metal tag welded to the
body.
Note: Metal G seats and special ball come
coated with a Molycoat and should not be
lubricated with silicone
For valves with “A” or “G” seats, before
putting the center section back between the
pipe ends make sure that the seat back seal is
located on the seat correctly. If it is not, it
could be damaged or cause the valve to leak
CAUTION: Do not scratch body seals when
replacing valve body.