Replacing An Installed Enviro-Seal Bellows Seal (Stem/Bellows Assembly) - Fisher EZ easy-e Instruction Manual

EZ Valve
November 2017
finger‐tight. Then, tighten the adaptor with a wrench until the valve stem hole lines up with the next adaptor pin
hole. Drive in a new pin (key 36, figure 11) to lock the assembly. Make certain the spiral wound gasket, shim, and
bonnet gasket (keys 12, 25, and 10, figure 12) are located on the shoulder of the seat ring retainer.
10. Inspect the seat ring. Replace, if necessary.
11. Install the new stem/bellows assembly with valve plug/adaptor by placing it into the valve body.
12. Place a new gasket (key 22, figure 11) over the stem/bellows assembly. Place the new ENVIRO‐SEAL bonnet over
the stem/bellows assembly.
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 representative immediately if a discrepancy between actual parts and approved parts
is suspected.
13. Properly lubricate the bonnet stud bolts. Install and tighten the bonnet hex nuts to the proper torque.
14. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 14 or 15.
15. Install the packing flange. Properly lubricate the packing flange stud bolts and the faces of the packing flange nuts.
For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 4. Then,
loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in table 4.
For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts
reaches the minimum recommended torque shown in table 4. Then, tighten the remaining flange nuts until the
packing flange is level and at a 90‐degree angle to the valve stem.
16. Install travel indicator parts, stem locknuts, and mount the actuator on the valve body according to the procedure
in the appropriate actuator instruction manual.
Replacing an Installed ENVIRO‐SEAL Bellows Seal (Stem/Bellows Assembly)
Instructions are provided for replacing an ENVIRO‐SEAL bellows seal (stem/bellows assembly) when the existing valve
has a metal seat. If the valve has a composition seat, refer to figure 13 and to composition seat information in the
Valves with ENVIRO‐SEAL Bellows Seal Bonnet procedure of the Trim Maintenance section.
1. Remove the actuator and bonnet according to steps 1 through 5 of the Replacing Packing procedure of the
Maintenance section.
Note
With some valve plug sizes and configurations, the valve plug will slide through the seat ring retainer and bushing assembly, and in
other configurations it won't. If the valve plug will not slide through the seat ring retainer and bushing assembly, then the valve
plug and stem assembly and the seat ring retainer and bushing assembly must be removed together.
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Instruction Manual
D100401X012