Flowserve CPT Series Metal Characterized Seat Control Valve - Manual (Page 2)

2 Metal Characterized-Seated Control Valve !?4
" –4" CPT 44 and !?2
" –4" CPT 51/52 Installation, Operation and Maintenance 17812-N
Flow Control Division
Worcester Controls
NOTE: Stainless steel bolts and nuts are used in all three-piece valves
with stainless steel bodies and also valves with “GG” seats and body
seals.
4. CAUTION:
a. The seat back seals, fluoropolymer body seals (T), and the
coated stainless steel gasket body seals (M and G) are not
reusable. Upon disassembly of the valve these seals must
be replaced. Also ensure that the fluoropolymer seals, or
the coating of the stainless steel gaskets is not scratched or
damaged during installation. Light lubrication of these seals
can help to prevent damage.
b. Care must also be taken when handling graphite thrust bear-
ings, stem seals or 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.
c. The ball used in CPT valves is round to special tolerances
to ensure proper contact with the seat. Do not drop, dent or
scratch the ball during handling. The ball also has a
special anti-galling coating; DO NOT use an uncoated ball
in CPT valves.
B. OPERATION
1. The operation consists of turning the stem A?f turn clockwise to
close and !?4 turn counter-clockwise to open. When stem flats
(!?4" – 2") or stem groove (3", 4") are in line with the pipeline, the
valve is open. This valve is designed to be automated.
2. CPT valves meet the leakage rates of ANSI B16.104 Class VI.
3. As shipped from the factory, valves contain a silicone-based
lubricant. This is for break-in purposes. Lubricant may be
removed with a solvent, such as lacquer thinner, if found to be
objectionable for a particular application, and replaced with a
non-silicone based lubricant. CPT valves should not be operated
without a break-in lubricant.
4. Media which can solidify, crystallize or polymerize should not be
allowed to stand in valve cavities.
5. Torque Requirements: Operating torque requirements will vary
depending on the length of time between cycles, line pressure, type
of valve seats, and the media in the system. All figures in the
following table are based in laboratory tests with water as the
media. They are measured at WOG rated pressure, 70°F, with clean
tap water, after 24 hours. For a more detailed analysis of valve
torque requirements, see Worcester’s Actuator Sizing Manual.
C. MAINTENANCE
1. For 3"– 4" CPT 44/51/52 Revision RO-R2 valves, if seepage is noted
at stem, tighten retaining nut 1/6 turn at a time until seepage stops.
2. Tighten stem seal retaining nut (!?2"– 2" CPT 44 Revision RO valves)
or self-locking stem nut (!?4"– 2" CPT 44 & !?2"– 2" CPT 51/52
Revision R1-R4 valves) if seepage is noted at stem.
CAUTION: For maximum stem seal life, proper stem adjustment
procedures must be followed. Excessive tightening causes higher
torque and shorter stem seal life.
Revision RO Valves:
a. Loosen top retaining nut.
b. While holding the stem to prevent turning, tighten bottom-
retaining nut until Belleville washers are flat (the nut will bottom).
c. Back off bottom retaining nut !?6 turn.
d. Tighten the top retaining nut securely to lock the bottom
retaining nut in place with the lockwasher in between. Hold the
bottom nut securely with wrench while tightening the top nut to
lock the two nuts in place.
Revision R1 -R4 Valves:
e. Tighten self-locking stem nut until Bellevilles washers are flat,
then back off nut !?3 turn.
CAUTION: The self-locking stem nut is difficult to tighten, and
must fully flatten Bellevilles before backing off.
D. REBUILDING
a WARNING: - BALL VALVES CAN TRAP PRESSURIZED FLUIDS IN
THE BALL CAVITY WHEN CLOSED.
If the valve has been used to handle hazardous media, it must be
decontaminated before disassembly. It is recommended that the
following steps be taken for safe removal and disassembly.
• Relieve the line pressure. Operate the valve prior to attempting
removal from line.
• Place the valve in half-open position and flush the line to
remove any hazardous material from the valve body.
• All persons involved in the removal and disassembly of the
valve should wear the proper protective clothing such as a face
shield, gloves, apron, etc.
1. A standard repair kit can be ordered for these valves consisting
of seats, control seat or control seat insert (3"– 6" valves only),
body seal(s), seat seal(s), Belleville washers, stem seal(s), thrust
bearing(s), and a self-locking stem nut (!?4"– 2" Revision R1-R4
valves only). Specify the valve size and series, the material of the
seat and body seal, the characterized seat configuration (if
needed), and the “R” number (Revision Number) of the valve or
for non-standard valve, the “P” number, “T” number, “C”
number, or similar, as found on either the mounting bracket
nameplate or the valve nameplate.
Maximum Expected
Valve Size Breakaway Torque
!?4
", !?2" 150 in-lb
#?4
" 175 in-lb
1" 250 in-lb
1!?2" 400 in-lb
2" 700 in-lb
3" 1900 in-lb
4" 3300 in-lb