Flowserve J Series Ball Valve - Manual (Page 2)

1. a. Disassembly of Valve:
1) Place valve in open position. Unscrew all flange bolts or
studs and nuts and remove valve from line.
2) With valve in closed position, remove end plug retaining
screws.
3) Remove end plug. If necessary, drive end plug from valve
using wooden drift applied to ball.
4) Remove body seal, ball, seats and seat back seals (if
any).
b. Removing Stem Assembly:
GENERAL NOTE: Due to different valve series and body styles,
one or two metal stem centering washers may be used and
the stem seal may be one-piece or three-piece.
1) Remove handle assembly (if any) by loosening handle
screw.
2) Remove retaining nut. Prevent stem from rotating by
holding stem with wrench.
3) Remove stop or valve stem spacer (actuated valves).
Remove and discard Belleville washer(s) (if any). Remove
and retain the follower.
4) Push stem into body cavity and remove. Remove stem
seal(s), stem seal protector (if any) and thrust bearing.
Remove and retain stem centering washer(s).
c. Visual Inspection:
1) The ball and the surfaces against which the seats and
seals are installed should be undamaged, clean and free
of pit marks and scratches. Light marring from the action
of the ball against the seats is normal and will not affect
the operation of the valve. Flaws which can be seen but
barely detected with finger tips are acceptable.
2) The stem and body surfaces that the thrust bearing and
stem seals contact, must be undamaged, clean and free
of pit marks and scratches.
d. Reassembly:
CAUTION: Care must be used when handling graphite stem
seals, thrust bearing, body seals and seat back seals.
These parts can be easily damaged by squeezing the O.D.
of the seal. Parts are to be handled on the flat surfaces
rather than the O.D. These parts will not work if they are
cracked or broken. Light flaking of the material is
acceptable. If resistance is encountered when installing
stem seals over the stem, use follower to gently push the
stem seal down.
1) Lightly lubricate the ball, seats, seat back seals (if used),
body seal, stem seal(s), stem seal protector (if any) and
thrust bearing with a lubricant compatible with media
being handled. White petroleum jelly is a good general
purpose lubricant.
2) To reassemble stem, reinstall stem centering washer(s)
into the recesses in the body. When only one washer is
used, it goes inside recess on top of the body and under
the stem seal(s). Place new thrust bearing onto stem and
insert through body cavity. The thrust bearing can be
distinguished from the stem seals by the darker color of
the 25% filled fluoropolymer used in the thrust bearing.
Assemble new stem seal(s) over the top of the stem and
down into the recess in the top of the body. The follower
is installed on top of the stem seal(s). For valves with
graphite stem seal(s), the stem seal is metallic silver gray
and thicker than the thrust bearing. A Belleville washer is
also added, concave side up over follower (3” - 8” sizes
only). Place stop (or spacer) onto valve stem.
3) When stem assembly is complete, place retaining nut
onto stem. Using handle or wrench to prevent rotation,
tighten retaining nut to fully compress packing or fully
flatten Belleville(s), if used, then back off
1 /
6
turn.
Excessive tightening causes higher torque and shorter
stem seal life.
4) Insert far seat and seat back seal (if any) in body. Make
sure seat rests firmly on back surface of recess. If the
seat back seal is not correctly positioned it could be
damaged or cause the valve to leak.
5) With valve in closed position (stop plate pointer and/or
stem groove going across the pipeline), insert ball into
body so that stem slot engages tang on stem.
6) Install and make sure body seal rests squarely on seal
surface of body.
CAUTION: If the body seal is installed on the end plug,
it will be damaged. Insert seat and seat seal (if any) in
recess of end plug, and slide the end plug into the body
as far as it will go.
7) Secure end plug in place by threading in the end plug
retaining screws and tightening each one firmly. Proper
installation will allow no more than .010 protrusion of the
end plug beyond the valve body.
8) Replace handle assembly (wrench block and extension)
and tighten hex head screw (manual valves only).
9) Upon reinstallation of the valve in the line, retighten the
end plug retaining screws after the flange bolts are fully
torqued.
After the valve is assembled, it should be cycled a few
times to ensure that the valve operates smoothly with no
chattering of the ball. The normal operation is an initial
high torque to “break” from the closed position to a
smooth running lower torque mid-cycle, to a high torque
at the end of the 90° cycle or open position. The torque is
similar when closing.
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