Instruction Manual
D100399X012
EW Valve
July 2017
19
valve plug in a soft‐jaw chuck or other type of vise so that the jaws grip a portion of the valve plug that is not a
seating surface. Drive out the pin (key 36, figure 21). Reverse the plug stem assembly and valve plug in the soft‐jaw
chuck or vise. Grip the flat areas on the valve stem just below the threads for the actuator/stem connection.
Unscrew the valve plug/adaptor assembly (key 24, figure 21) from the valve stem assembly (key 20, figure 21).
select the proper drill size. Drill through the stem or adaptor, using the hole in the valve plug as a guide. Remove
any chips or burrs, and drive in a new pin to lock the assembly.
5. For ENVIRO‐SEAL bellows seal bonnets, grip the flats of the stem extending out of the top of the bellows shroud
with a soft‐jaw chuck or other type of vise. Screw the valve plug/adaptor assembly onto the valve stem. Tighten as
necessary to align the pin hole in the stem with one of the holes in the adaptor. Secure the adaptor to the stem with
a new pin.
Trim Replacement
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 construction, and figure 24 for EWT constructions. Refer to figures 26 and 27
for Cavitrol III, figure 28 for Whisper Trim III, and figure 29 for WhisperFlo constructions.
1. With a restricted‐trim seat ring construction, install the adaptor gasket (key 14) and seat ring adaptor (key 5).
2. Install the seat‐ring gasket (key 13), seat ring (key 9), or disk seat (key 22). With a PTFE‐seat construction install the
disk and disk retainer (keys 21 and 23). With an NPS 8x6 CL900 EWT valve with Cavitrol III cage, install the spiral
wound gasket (key 12) on the seat ring.
3. Install the cage or cage/baffle assembly (key 3). Any rotational orientation of the cage or assembly with respect to
the valve is acceptable. A Whisper Trim III cage designated by level A3, B3, or C3 may be installed with either end
up. The level D3 cage/baffle assembly or Cavitrol III cage assembly, however, must be installed with the hole pattern
end next to the seat ring. If a cage retainer (key 31) is to be used, place it on top of the cage.
4.
For constructions other than TSO (tight shutoff trim)
, slide the valve plug (key 2) and stem assembly or valve plug
and ENVIRO‐SEAL bellows seal assembly into the cage. Make sure the piston ring or seal ring (key 6 or 28) is evenly
engaged in the entrance chamfer at the top of the cage (key 3) or cage retainer (key 31) to avoid damaging the ring.
5.
For TSO (tight shutoff) trim constructions
, perform the following steps (refer to figures 7 and 8).
D
Thread the outer plug onto the inner plug until the parts seat metal to metal, using a strap wrench or similar tool
that will not damage the outer plug guide surfaces.
D
Mark the top of the inner plug and outer plug with alignment marks in the assembled position.
Table 7. Valve Stem to Plug Torque and Pin Replacement Data
VALVE STEM DIAMETER
STEM TORQUE, MINIMUM TO MAXIMUM
DRILL SIZE, INCHES
mm
Inch
N
S
m
Lbf
S
ft
12.7
1/2
81 to 115
60 to 85
1/8
19.1
3/4
237 to 339
175 to 250
3/16
25.4
1
420 to 481
310 to 355
1/4
31.8
1‐1/4
827 to 908
610 to 670
1/4
D
Disassemble the outer plug from the inner plug and install the seal over the inner plug, so that the seal rests below
the threaded area.
D
Thread the outer plug onto the inner plug and tighten with a strap wrench or similar tool until the alignment marks
line up. This will ensure that the plug parts are metal to metal and the seal is compressed properly. Do not damage
the outer plug guide surfaces.
D
Install set screws centering the inner plug in the outer plug and torque to 11 N
S
m (8 lbf
S
ft).
