Fisher EHD series Instruction Manual page 15

Instruction Manual
D100392X012
6. Install the valve plug into the cage.
7. Install the other cage gasket (key 11) between the cage and the bonnet.
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. Cheater bars or slug wrenches should not be used for this
procedure.
Hot torquing is not recommended; it may result 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
and approved parts is suspected.
8. Install the bonnet over the valve stem and onto the valve body. Lubricate the threads of the studs (key 13) and the
faces of the hex nuts (key 14) with anti‐seize lubricant (key 24). Secure the bonnet with hex nuts (key 14) and
washers (key 29). 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 torque value
and repeat the crisscross pattern. Repeat this procedure until all nuts are tightened to the specified nominal value.
Repeat the final torque value and if any nut still turns, tighten every nut again.
9. 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.
10. 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.
For spring‐loaded PTFE V‐ring packing: Tighten the packing flange nuts until the shoulder on the packing follower (key
13) contacts the bonnet (key 1).
For other kinds of packing, except ENVIRO‐SEAL and HIGH‐SEAL: Tighten the packing flange nuts to the maximum
recommended torque shown in table 5. Then, loosen the packing flange nuts and retighten them to the
recommended minimum torque in table 5.
For ENVIRO‐SEAL and HIGH‐SEAL packing: See the Fisher instruction manuals titled ENVIRO‐SEAL Packing System for
Sliding‐Stem Valves (D101642X012) or HIGH‐SEAL Live‐Loaded Packing System (D101453X012) (as appropriate) for
packing instructions.
11. Mount the actuator by following the Actuator Mounting procedure. Check for packing leakage as the valve is
being put into service. Retorque the packing flange nuts as required (see table 5). Then, retighten the hex nuts (key
14) to the torque shown in table 6.
Emerson sales office or Local Business Partner immediately if a discrepancy between actual parts
EH Valves NPS 8 through 14
June 2017
15