Instruction Manual
D100399X012
EW Valve
July 2017
15
CAUTION
In the following applicable procedures, to avoid damaging parts, do not grip the bellows shroud or other parts of the
stem/bellows assembly. Grip only the flat areas on the stem where it extends out of the top of the bellows shroud.
For C‐seal construction, see the appropriate C‐seal sections in this instruction manual.
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 construction.
Trim Removal
1. Remove the actuator and the bonnet according to steps 1 through 5 of the Replacing Packing procedure.
WARNING
Avoid personal injury or property damage from valve or packing leakage.
When lifting the valve plug stem (key 7) and attached valve plug (key 2) out of the valve, be certain that the cage (key 3)
remains in the valve (key 1). This will prevent cage damage that might be caused by the cage dropping back into the valve
after being lifted part way out.
Use care to avoid damaging gasket sealing surfaces.
Each graphite piston ring (key 6) in an EWD valve is brittle and in two pieces. Use care to avoid damage to the piston ring(s)
caused by dropping or rough handling.
Any damage to the gasket sealing surfaces could cause the valve to leak. The surface finish of the valve stem (key 7) is
critical for making a good packing seal. The inside surface of the cage or cage/baffle assembly (key 3) or cage retainer (key
31) is critical for smooth operation of the valve plug and for making a seal with the piston ring (key 6) or seal ring (key 28).
The seating surfaces of the valve plug (key 2) and the seat ring (key 9) on a metal‐seat construction are critical for tight
shutoff. Protect these parts accordingly while disassembling the trim.
21). Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or
other tool that will not scratch the packing box wall. Clean the packing box and the metal packing parts.
3. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.
Scratches or burrs could cause packing box leakage or damage to the new packing. If the surface condition cannot
be improved by light sanding, replace the damaged parts.
4. Remove the load ring (key 26) from an NPS 10x8 or 12x8 valve or the cage adaptor (key 4) from any restricted‐trim
valve through NPS 8x4, and wrap it for protection.
5. On a 102 mm (4‐inch) travel valve with Whisper Trim I cage or on any NPS 8x6 or 12x6 valve with Whisper Trim III
cage, remove the bonnet spacer (key 32) and bonnet gasket (key 10) on top of the spacer. Then on any
construction with a cage retainer (key 31), remove the cage retainer and its associated gaskets. A Whisper Trim III
cage retainer has two 3/8‐inch ‐ 16 UNC tappings in which screws or bolts can be installed for lifting.
6. Remove the cage or cage/baffle assembly (key 3) and the associated gaskets (keys 10, 11, and 12). With
full‐capacity constructions that have FGM gasket sets, a shim (key 53) is used instead of the cage gasket (key 11). If
the cage is stuck in the valve, use a rubber mallet to strike the exposed portion of the cage at several points around
its circumference.
