Instruction Manual
D100394X012
EH (1-1/2x1 through 8x6)
July 2017
21
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 Emerson sales office
or Local Business Partner immediately if a discrepancy between actual parts
and approved parts is suspected.
3. Lubricate the stud threads and the faces of the hex nuts (key 14, figure 18, 19, or 20) with anti‐seize lubricant (not
necessary if new factory prelubricated hex nuts are used). Replace the flat washers (key 29, figure 18, 19, 17, or 20)
if present. If the valve assembly includes Belleville washers (key 33, figure 17) install these onto the studs (key 14,
figure 17) with the concave side facing towards the valve body. Replace the hex nuts but do not tighten them.
Torque the nuts in a crisscross pattern to no more than one fourth of the nominal torque value specified in table 8.
When all nuts are tightened to that torque value, increase the torque by one fourth 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 13 and 14 of the Replacing Packing procedure. Be certain to
observe the note given prior to step 13 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.
Figure 10. Fisher EHD with C‐seal Trim
FLOW DOWN FLOW UP
VIEW A
37B1047‐A
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