Retrofit: Installing C-Seal Trim - Fisher Design ED series Instruction Manual

Table 5. Valve Stem Connection Torque and
Pin Replacement
VALVE STEM
CONNECTION (VSC) MINIMUM TO MAXIMUM
mm Inch
9.5 3/8
12.7 1/2
19.1 3/4
25.4 1
31.8 1-1/4
1. With a restricted-trim seat ring construction, install
the adaptor gasket (key 14) and seat ring adaptor
(key 5).
2. Install the seat ring gasket (key 13), seat ring or
liner (key 9).
3. Install the cage or cage/baffle assembly (key 3).
Any rotational orientation of the cage or assembly with
respect to the valve is acceptable. A Whisper Trim III
cage designated by level A3, B3, or C3 may be
installed with either end up. The level D3 cage/baffle
assembly, however, must be installed with the hole
pattern end next to the seat ring. If a cage retainer
(key 31) is to be used, place it on top of the cage.
4. Slide the valve plug (key 2) and stem assembly, or
valve plug and ENVIRO-SEAL bellows seal assembly,
into the cage until the piston ring(s) is level with the top
of the cage (key 3) or cage retainer (key 31).
5. Installing piston rings (key 6):
a. For valve plugs with a single piston ring:
Make sure the piston ring is evenly engaged into
the entrance chamfer at the top of the cage or cage
retainer ring. Carefully press the piston ring into the
cage or cage retainer ring.
b. For valve plugs with multiple piston rings: As
each piston ring is slid into the cage, make sure the
ring is evenly engaged in the entrance chamfer at
the top of the cage or cage retainer. Also, make
sure to offset the fracture in the rings to minimize
leakage. Carefully press each piston ring into the
cage or cage retainer ring.
6. Place the gaskets (keys 12, 11 or 14 if used,
and 10) and the shim (key 27 or 51) if used on top of
the cage or cage retainer. If there is a cage adaptor
(key 4) or a bonnet spacer (key 32), set it on the cage
or cage retainer gaskets and place another flat sheet
gasket (key 10) on top of the adaptor or spacer. If
there is only a cage retainer, place another flat sheet
gasket on the retainer.
7. With an 8-inch Design ED valve, install the load
ring (key 26).
Design ED & EAD Class 125-600
TORQUE,
DRILL
SIZE INCH SIZE, INCH
NSm LbfSft
40 to 47 25 to 35
81 to 115 60 to 85
237 to 339 175 to 250
420 to 481 310 to 355
827 to 908 610 to 670
8. Mount the bonnet on the valve and complete
assembly according to steps 10 through 14 of the
Replacing Packing procedure. Be sure to observe the
note prior to step 10.
3/32
1/8
3/16
1/4
1/4

Retrofit: Installing C-seal Trim

Additional actuator thrust is required for
a valve with C-seal trim. When installing
C-seal trim in an existing valve, contact
your Fisher sales office for assistance in
determining new actuator thrust
requirements.
Assemble the new valve plug/retainer assembly (with
C-seal plug seal) using the following instructions:
To avoid leakage when the valve is
returned to service, use appropriate
methods and materials to protect all
sealing surfaces of the new trim parts
while assembling the individual parts
and during installation in the valve body.
1. Apply a suitable high-temperature lubricant to the
inside diameter of the C-seal plug seal. Also, lubricate
the outside diameter of the valve plug where the
C-seal plug seal must be pressed into the proper
sealing position (figure 6).
2. Orient the C-seal plug seal for correct sealing
action based on the process fluid flow direction
through the valve.
D The open interior of the C-seal plug seal must
face up in a valve with flow-up construction (figure 6).
D The open interior of the C-seal plug seal must
face down in a valve with flow-down construction
(figure 6).
Note
CAUTION
11