Instruction Manual
D100399X012
EW Valve
July 2017
27
3. Place the C‐seal plug seal over the top of the valve plug and press it onto the plug using the installation tool.
Carefully press the C‐seal plug seal onto the plug until the installation tool contacts the horizontal reference surface
of the valve plug (figure 11).
4. Apply a suitable high‐temperature lubricant to the threads on the plug. Then, place the C‐seal retainer onto the
plug and tighten the retainer using an appropriate tool such as a strap wrench.
5. Using an appropriate tool such as a center punch, stake the threads on top of the plug in one place (figure 12) to
secure the C‐seal retainer.
6. Replace the piston ring(s) following instructions in the Trim Replacement section of this manual.
7. Return the seat ring, cage, plug/retainer assembly, and stem to the valve body and completely reassemble the valve
package following the appropriate instructions in the Trim Replacement section of this manual.
CAUTION
To avoid excessive leakage and seat erosion, the valve plug must be initially seated with sufficient force to overcome the
resistance of the C‐seal plug seal and contact the seat ring. You can correctly seat the valve plug by applying the full
actuator load. This force will adequately drive the valve plug to the seat ring, thus giving the C‐seal plug seal a
predetermined permanent set. Once this is done, the plug/retainer assembly, the cage, and the seat ring become a
matched set.
With full actuator force applied and the valve plug fully seated, align the actuator travel indicator scale with the lower end
of valve travel. Refer to the appropriate actuator instruction manual for information on this procedure.
ENVIRO‐SEAL Bellows Seal Bonnet
Replacing a Plain or Extension Bonnet with an ENVIRO‐SEAL Bellows Seal Bonnet
(Stem/Bellows Assembly)
Except where indicated, key numbers in this section are referenced in figure 22 for EWD constructions, figure 22 for
restricted trim detail, figure 23 for EWS constructions, and figure 24 for EWT constructions. Refer to figures 26 and 27
for Cavitrol III, figure 27 for Whisper Trim III, and figure 29 for WhisperFlo constructions.
Table 8. Recommended Torque for ENVIRO‐SEAL Bellows Seal Bonnet Packing Flange Nuts
VALVE SIZE,
NPS
VALVE STEM
DIAMETER THROUGH
PACKING
MINIMUM TORQUE MAXIMUM TORQUE
NSm LbfSin NSm LbfSin
4x2 1/2 2 22 4 33
6x4 to 12x8 1 5 44 8 67
1. Remove the actuator and bonnet according to steps 1 through 6 of the Replacing Packing procedure in the
Maintenance section.
2. Lift out the cage.
3. Remove and discard the existing bonnet gasket. Cover the valve body opening to protect sealing surfaces and to
prevent foreign material from entering the valve body cavity.
Note
The ENVIRO‐SEAL stem/bellows assembly for easy-et 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 can be installed.
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