Emerson Fisher EHD Instruction Manual page 11

Instruction Manual
D100394X012
rounded rod or other tool that will not scratch the packing box wall. For extension bonnets, also remove the baffle
(key 2) and retaining ring (key 35).
9. Clean the packing box and the following metal packing parts: packing follower (key 13), packing box ring (key 11),
spring or lantern ring (key 8, figures 4 and 16), and, for single arrangements of PTFE V‐ring packing only, special
washer (key 10, figures 4 and 16).
10. Inspect the valve stem threads for any sharp edges that might cut the packing. A whetstone or emery cloth may
be used to smooth the threads if necessary.
11. Remove the protective covering from the valve body cavity. Using new top and bottom cage gaskets (key 11,
figure 18, 19, or 20), place the cage into the valve body. Be sure the cage lugs are engaged in the corresponding
recesses of the seat ring retainer. Turn the cage clockwise until the lugs contact the seat ring retainer. Install the
plug, then slide the bonnet over the stem and onto the studs (key 13, figure 18, 19, or 20).
Note
The prelubricated hex nuts (key 14, figure 18, 19, or 20) referred to in step 12 can be identified by a black film coating on the nut
threads.
The proper bolting procedures in step 12 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 8 may result in cage
crushing, cage diameter reduction, and/or bonnet deformation. Cheater bars or slug wrenches should not be used for this
procedure.
Hot torquing is not recommended.
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
and approved parts is suspected.
12. 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).
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
Torque the nuts in a crisscross pattern to no more than one fourth of the nominal torque value specified in table 8.
Emerson sales office or Local Business Partner immediately if a discrepancy between actual parts
Replace the flat washers (key 29,
hex nuts but do not tighten them.
EH (1-1/2x1 through 8x6)
July 2017
figure 18, 19, 17, or 20)
11