Instruction Manual
D100425X012
YD and YS Valves
October 2014
18
11. Place a new gasket (key 22) 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 Process Management representative immediately if a discrepancy between actual
parts and approved parts is suspected.
12. Properly lubricate the bonnet stud bolts. Install and tighten the bonnet hex nuts to the proper torque.
13. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 17 or 18.
14. 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 6. Then,
loosen the packing flange nuts, and retighten them to the rec ommended minimumtorqueshownintable6.
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 6. Then, tighten the remaining flange nut until the
packing flange is level and at a 90-degree angle to the valve stem.
15. Install travel indicator parts and stem locknuts; mount the actuator onto the valve according to the procedure in
the appropriate actuator instruction manual.
Replacement of an Installed ENVIRO-SEAL Bellows Seal Bonnet (Stem/Bellows Assembly)
1. Remove the actuator and bonnet according to steps 1 through 4 of the Disassembly procedure in the Maintenance
sectiononpage7.
CAUTION
To prevent possible product damage, c over the opening in the valve in the following procedure to protect the sealing
surfaces and to prevent foreign material from getting into the valve body cavity.
2. Carefully remove the ENVIRO-SEAL stem/bellows assembly. If necessary, also lift out the cage. Remove and discard
the existing bonnet gasket and bellows gasket. Cover the valve body opening to protect sealing surfaces and to
prevent foreign material from entering the valve body cavity.
CAUTION
The ENVIRO-SEAL stem/bellows assembly for YD and YS valves is available only with a threaded and drilled
plug/adaptor/stem connection. The existing valve plug can be reused with the new stem/bellows assembly or a new plug
(24 strony)
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