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

2. Avoid scratching or damaging the fluoropolymer seals or the
coating of the stainless steel gaskets during installation. Light
lubrication of these seals can help to prevent damage.
3. “S” gaskets are installed with the wide flange against the
valve body (see View A-A on page 6).
4. Care must also be taken when handling graphite seat back
seals, stem seals, thrust bearings, and body seals. These
parts can be easily damaged by squeezing the O.D. Parts
should 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.
5. 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. These balls also have an
anti-galling coating; DO NOT use uncoated balls with CPT
valves.
II. OPERATION
A. The operation of the valve consists of turning the stem 1 /
4
turn
clockwise to close and 1 /
4
turn counter-clockwise to open. When
the stem flats ( 1 /
2
"-2") or groove (3" and 4") are in line with the
pipeline, the valve is open. These valves are designed to be
automated.
B. CPT 94 Series valves meet the leakage rates of ANSI B16.104
Class VI.
C. As shipped from the factory, valves contain a silicone-based
lubricant. This is for break-in purposes and may be removed if it
is objectionable for a particular application by disassembling and
solvent washing. Lacquer thinner will remove the lubricant.
Replace with a non-silicone based lubricant. CPT valves should
not be operated without a break-in lubricant.
D. Media that can solidify, crystallize or polymerize should not be
allowed to stand in ball valve cavities.
E. Torque Requirements: Operating torque requirements will vary
depending on the length of time between cycles, media in the
system, line pressure and type of valve seats. The figures in the
following table are based on laboratory tests with clean tap water
as the media. They are measured at WOG rated pressure, 70˚F,
after 24 hours. For a more detailed analysis of valve torque
requirements, see the Worcester Actuator Sizing Manual.
Valve Size - 1 /
2
" 3 /
4
" 1" 1 1 /
2
" 2" 3" 4"
Maximum Expected - 240 265 360 550 850 2100 3500
Breakaway
(In.-Lbs.)
NOTE: Media that contain fine powders (25 microns or less) will
significantly raise ball valve torque requirements.
III. MAINTENANCE
For maximum stem seal life, proper packing adjustment procedure
must be followed.
A. Tighten packing gland bolts to the torque values in the table
below. Alternate between the two gland bolts when tightening to
maintain the alignment of the gland plate with the top of the valve
body. Some rocking of the gland plate can be tolerated; however,
excessive misalignment may cause premature failure of the stem
packing.
IV. REBUILDING
This manual contains exploded views of the valves covered by the
text. They have been included to aid in the rebuilding of the valves.
Please refer to them when following the written instructions.
a WARNING: BALL VALVES CAN TRAP PRESSURIZED FLUIDS IN THE
BALL CAVITY WHEN CLOSED.
NOTE: 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 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.
CARBON STEEL BOLTS STAINLESS STEEL & ALLOY 20 BOLTS
2 Metal Characterized Seated Control Valves Installation, Operation and Maintenance Instructions 09015-G
Flow Control Division
Worcester Controls
Bolt Diameter
1 /
4
"
5 /
16
"
3 /
8
"
7 /
16
"
1 /
2
"
In.-Lbs.
96-120
155-204
216-262
480-540
720-780
Ft.-Lbs.
8-10
13-17
18-22
40-45
60-65
Bolt Diameter
1 /
4
"
5 /
16
"
3 /
8
"
7 /
16
"
1 /
2
"
In.-Lbs.
72-94
120-144
192-216
336-384
504-552
Ft.-Lbs.
6-8
10-12
16-18
28-32
42-46
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.