Instruction Manual
D100398X012
ET Valve
November 2017
15
Note
For plain bonnets and style 1 extension bonnets, the valve plug (key 2), valve stem (key 7), and pin (key 8) are available completely
assembled. Refer to the Key 2, 7, and 8 Valve Plug and Stem Assembly tables in the Parts List.
2. To replace the valve stem (key 7), drive out the pin (key 8). Unscrew the valve plug from the stem or adaptor.
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 14). Reverse the plug stem assembly 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 14) from the valve stem assembly (key 20, figure 14).
select the proper hole 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.
Table 5. Valve Stem Connection Assembly Torque and Pin Replacement
VALVE STEM DIAMETER
TORQUE, MINIMUM TO MAXIMUM
HOLE SIZE
mm
Inches
N
S
m
Lbf
S
ft
mm
Inch
9.5
12.7
19.1
25.4
31.8
3/8
1/2
3/4
1
1‐1/4
40‐47
81‐115
237‐339
420‐481
827‐908
25‐35
60‐85
175‐250
310‐355
610‐670
2.41 ‐ 2.46
3.20 ‐ 3.25
4.80 ‐ 4.88
6.38 ‐ 6.45
6.38 ‐ 6.45
0.095 ‐ 0.097
0.126 ‐ 0.128
0.189 ‐ 0.192
0.251 ‐ 0.254
0.251 ‐ 0.254
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.
Assembly
Except where indicated, key numbers are referenced in figure 16 for standard NPS 1 through 6 constructions, figure 17
for Whisper Trim III detail, figures 18 and 19 for WhisperFlo detail, and figure 20 for Cavitrol III detail and the NPS 8 ET
valve.
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 or liner (key 9), or disk seat (key 22). With a PTFE‐seat construction,
install the disk and disk retainer (keys 21 and 23).
3. Install the cage or cage/baffle assembly (key 3). Any rotational orientation of the cage or assembly with respect to
the valve body 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 seal ring (key 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 6 and 7).
a. 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.
b. Mark the top of the inner plug and outer plug with alignment marks in the assembled position.