Retrofit: Installing C-Seal Trim - Fisher HPA Instruction Manual

HP and HPA Valves
July 2017
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your
and approved parts is suspected.
3. Lubricate the stud threads and the faces of the hex nuts (key 14) with anti‐seize lubricant (not necessary if new
factory prelubricated hex nuts are used). Replace the hex nuts, but do not tighten them. Torque the nuts in a
crisscross pattern to no more than 1/4 of the nominal torque value specified in table 8. When all nuts are tightened
to that torque value, increase the torque by 1/4 of the specified nominal torque and repeat the crisscross pattern.
Repeat this procedure until all nuts are tightened to the specified nominal value. Apply the final torque value again
and, if any nut still turns, tighten every nut again.
4. Install new packing and packing box parts per steps 15 and 16 of the Replacing Packing procedure. Be certain to
observe the note given prior to step 15 of that procedure.
5. Mount the actuator by following the procedures in the actuator instruction manual. Check for packing leakage as
the valve is being put into service. Retorque the packing flange nuts as required (see table 7).
Retrofit: Installing C‐seal Trim
Note
Additional actuator thrust is required for a valve with C‐seal trim. When installing C‐seal trim in an existing valve, contact your
Emerson sales office or Local Business Partner for assistance in determining new actuator thrust requirements.
Assemble the new valve plug/retainer assembly (with C‐seal plug seal) using the following instructions:
CAUTION
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 11).
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 11).
D The open interior of the C‐seal plug seal must face down in a valve with flow‐down construction (figure 11).
Note
An installation tool must be used to properly position the C‐seal plug seal on the valve plug. A tool is available as a Fisher spare part
or a tool could be manufactured following the dimensions given in figure 12.
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Emerson sales office or Local Business Partner immediately if a discrepancy between actual parts
Instruction Manual
D101634X012