Instruction Manual
D100392X012
EH Valves NPS 8 through 14
July 2014
11
12. Slide the bonnet over the stem and onto the bonnet studs (key 13, figure 12 or 14).
Note
Proper performance of the bolting procedures in step 13 compresses the cage gaskets (key 11, figure 12 or 14) enough to seal the
body-to-bonnet joint.
The prelubricated hex nuts (key 14, figure 12 or 14) referred to in step 13 can be identified by a black film coating on the nut
threads.
The proper bolting procedures in step 13 include, but are not limited to, ensuring that the bonnet stud threads are clean, Belleville
washers (if present) are installed in the correct orientation, and that the hex nuts are evenly tightened to the specified torque
values.
CAUTION
Failure to comply with good bonnet-to-body bolting practices and the torque values shown in table 6 may result in cage
crushing, cage diameter reduction, and/or bonnet deformation. Do not use cheater bars or slug wrenches for this
procedure.
Hottorquingisnotrecommended;itmayresult in damage to valve components.
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
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 Process Management representative immediately if a discrepancy between actual
parts and approved parts is suspected.
13. Lubricate the stud threads and the faces of the hex nuts (key 14, figure 12 or 14) with anti-seize lubricant (not
necessary if new factory prelubricated hex nuts are used). Replace the flat washers (key 29, figure 12 or 14) and
Belleville washers (key 33, figure 13), if included with the valve body assembly. Belleville washers must be installed
so that the concave side is facing towards the valve body or flat washer. Replace the hex nuts and torque the nuts in
a crisscross pattern to no more than 1/4 of the nominal torque value specified in table 6. 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.
14. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 4. Slip a
smooth-edged pipe over the valve stem, and gently tamp each soft packing part into the packing box.
15. Slide the packing follower, wiper, and packing flange into position. Lubricate the packing flange studs (key 4) and
the faces of the packing flange nuts (key 5) and then install the packing flange nuts.
(24 pages)
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