Flowserve CPT Series Metal Characterized Seat Control Valve - Manual (Page 3)

17812-N Metal Characterized-Seated Control Valve !?4
" –4" CPT 44 and !?2
" –4" CPT 51/52 Installation, Operation and Maintenance 3
CAUTION: If the seats and seals installed differ from those removed,
the valve nameplate must be replaced or remarked to indicate the
altered materials and ratings, or valve tagged to so indicate.
2. To Disassemble !?4"– 2" CPT 44 Valves (All Revisions):
a. Remove actuator and all four body nuts and bolts, and place the
valve in the open position.
b. Remove center section from between pipe ends by separating
the pipe ends from the body by at least !?8" to allow locating
diameter on the back of the metal characterized seat (inserted
into oversized pipe end bore) to clear pipe end flange.
c. With valve in closed position, remove old seats, seat back
seal(s), body seals and ball.
d. Revision RO Valves: Using a wrench to prevent stem from
turning, remove top retaining nut, lockwasher, bottom retaining
nut, and (2) Belleville washers from stem.
Revision R1-R4 Valves: Using a wrench to prevent stem from
turning, remove self-locking stem nut, and (4) Belleville washers
from stem.
e. Remove the follower, stem, stem seal(s), stem seal protector (if
any), thrust bearing, and thrust bearing protector (if any), which
may be on the stem or in the body cavity. Retain the follower.
To Disassemble !?2"– 2" CPT 51/52 Valves (All Revisions):
f. Remove actuator from valve. Remove valve from line. Unscrew
end plug and set aside. If the body seal was not removed with the
end plug, remove it from the body and discard. Also remove the
near seat and seat back seal, if applicable. Place valve in closed
position and remove the ball, the far seat and seat seal.
NOTE: If required, end plug removal tools are available from your
supplier or from your Worcester representative.
g. Using a wrench to prevent stem from turning, remove self-
locking stem nut, and (4) Belleville washers from stem.
NOTE: On the !?2" valve, the far seat must be removed before pushing
stem into cavity.
h. Remove the follower, stem, stem seal(s), stem seal protector
(if any), and thrust bearing, and thrust bearing protector (if
any), which may be on the stem or in the body cavity. Retain
the follower.
To Disassemble 3"– 4" CPT 44/51/52 Valves (All Revisions):
i. Remove actuator from valve. Unscrew all flange bolts and nuts
and remove valve from line. Remove all end plug retaining set
screws from the valve body. Remove end plug. If necessary, drive
end plug from the valve using a wooden drift applied to the ball.
If the body seal was not removed with the end plug, remove it
from the body and discard. Also remove the near seat and seat
back seal (if any). Place valve in closed position and remove the
ball, the far seat, seat insert (if used), and seat back seal.
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, and may include a stem
seal protector.
j. Prevent the stem from turning by holding inside body. (The ball
can be inserted and prevented from rotating with a non-metallic
rod such as a screwdriver handle.) This will hold the stem
stationary without damaging the ball. Remove retaining nut and
stem spacer (if used).
k. Remove Belleville washers (if any). Remove and retain the
follower and push stem into ball cavity and remove. Discard old
stem seal protector (if any), stem seal(s) and thrust bearing,
which may be stuck on the stem or in the body cavity. Remove
stem-centering washer(s) and retain.
3. Visual Inspection:
a. As noted in part A.4.c, the ball is round to special tolerances and
should be visually checked for defects. Light marring from the
action of the ball against the seats is normal and will not affect
the operation of the valve. Visible tracking is normal. Tracking
which can be felt is a potential problem.
b. The stem and body surfaces that the thrust bearing and stem
seal contact should be clean, undamaged, and free of pit marks
and scratches.
4. Reassembly:
NOTE: For all valves, lightly lubricate the ball, seats, seat back seal(s),
body seal(s), stem seal(s), and thrust bearing(s) with a lubricant
compatible with the media and temperature being handled. White
petroleum jelly is a good general-purpose lubricant.
When a repair kit is purchased, the seats will be lubricated at the
factory. If they are not, they should be lubricated as noted in
Paragraph D.4. and B.3. DO NOT operate a newly rebuilt valve
without break-in lubricant. The seat back seals will be pre-
assembled to the seat backs.
If graphite parts are used, handle them gently on the flat surfaces
rather than the O.D. These parts can be easily damaged by
squeezing the O.D. These parts will not work if they are cracked or
broken. Light flaking of the material is acceptable.
For stem area rebuilding of all CPT valves, refer to exploded views,
stem build illustrations, and stem component color chart on the
following pages that pertain to the particular valve being rebuilt.
Please note that PEEK thrust bearing and stem seal protectors are
placed outside of seals and bearings. The seals and bearings must
contact the body.
Flow Control Division
Worcester Controls
Repair Kit Order Example
1" CPT RK 44 GG G60 R1 or TO914
(Size) (Valve Series) (Repair Kit) (Valve Type) (Seat, Seal) (Characterized Seat Configuration) (Revision # or P, T, C, etc., #)
Not Used with A?s"– 2" CPT
44 Revision RO Valves