Flowserve Worcester Controls Miser Ball Valves - Manual (Page 3)

C. MAINTENANCE
Tighten retaining nut if seepage is noted at stem.
CAUTION: For maximum stem seal life, proper stem adjustment
procedure must be followed.
Excessive tightening causes higher torque and shorter stem seal life.
For CL44 valves only, immediately after the first frost is detected
around the stem, tighten the retaining or self-locking nut, as stated
below, to adjust the compression of the stem seals.
For Valves with two stem nuts and a lockwasher
(with or without handle):
1. Tighten retaining nut (lower nut) until Belleville washers are flat,
the nut will “bottom”.
2. Back off retaining nut 1 /
6
turn.
3. Tighten handle nut securely to lock retaining nut in place. (On
some automated valves, two retaining nuts are used with a
lockwasher in between. Hold the bottom nut securely with a
wrench while tightening the top nut to lock the 2 nuts in place.)
For Valves with self-locking stem nut (and four Belleville washers):
1. Tighten self-locking stem nut until Belleville washers are flat, the
nut will “bottom”.
2. Back off nut 1 /
3
turn.
CAUTION: The self-locking stem nut is difficult to tighten, and
must fully flatten Belleville washers before backing off.
D. REBUILDING
a WARNING: BALL VALVES CAN TRAP PRESSURIZED FLUIDS IN
BALL CAVITY WHEN CLOSED
Special handling and cleaning procedures are necessary for oxygen
and vacuum service valves. Refer to industry practices when
overhauling these units.
If the valve has been used to control hazardous media, it must be
decontaminated before disassembly. It is recommended that the
following steps are taken for safe removal and disassembly:
• Relieve the line pressure. Operate the valve prior to attempting
removal from line.
• Place valve in half-open position and flush the line to remove any
hazardous material from valve.
• For CL44 valves, refer to Chlorine Institute Pamphlet 6 procedure
for flushing and drying, and for additional information on
precautions and cleaning.
• All persons involved in the removal and disassembly of the valve
should wear the proper protective clothing such as face shield,
gloves, apron, etc.
1. A standard repair kit may be ordered for these valves, consisting
of seats and body seals or one-piece (three-way) seat/body seals,
two or four Belleville washers, seat back seals (used with “A” or
“G” seat only), stem seal(s), and thrust bearing(s). specify the
material of seats and body seals, size, series and R number
(revision number) of valve or for non-standard valve, the “P”, “T”,
“C”, or similar number, as found on the valve body, stop plate,
handle, valve nameplate or on the actuator bracket nameplate. If
valve body is stainless steel or Alloy 20, place a “6” after valve
size in repair kit ordering code.
To Order: Valve Size/Series/RK 44 or 59/Material/Revision No., or
P, T, C, etc., Number
Examples:
1" 6 FZ RK 44 PM RO
1" RK 59 PM R16
1 /
2
" RK 44 RT TO914
CAUTION: If the seats and seals installed differ from those
removed, the valve nameplate or stop must be replaced or
remarked to indicate the altered materials and ratings, or valve
tagged to so indicate.
2. To replace seats and seals:
a. Place valve in open position, remove three body nuts and
bolts, loosen fourth, swing out center section from between
pipe ends with valve open. Some AF44 and FZ44 fire valves
require the removal of all four bolts and spreading the pipe
ends to clear the pipe end centering rings, if any (valves with
“G” seats or revision R4 and later fire valves do not use
centering rings).
b. With valve in closed position, remove old seats, body seals or
one-piece (three-way) seat/body seals, seat back seals (if
any), and ball.
c. Remove handle nut, lockwasher, separate handle and stop or
one-piece handle and stop (if manual valve). (This step is not
applicable to valves with self-locking stem nut.)
d. Using handle or a wrench to prevent stem from turning,
remove retaining or self-locking stem nut, Belleville
washers, and follower from stem. Remove the stem through
body cavity.
e. Remove thrust bearing(s) from body or stem; stem seal(s),
and stem seal protector (if any), from recess in top of body.
f. Clean all sealing surfaces of valve including the ball.
Flow Control Division
Worcester Controls
WCAIM2030 Miser Ball Valves 3