EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
9
VALVE
STEM
STEM TORQUE
DRILL SIZE,
INCHES
D
DIMENSION
mm
Inch
N
S
m
Lbf-ft
mm
Inch
9.5
12.7
19.1
3/8
1/2
3/4
40-47
81-115
237-339
25-35
60-85
175-250
3/32
1/8
3/16
16
19
25
0.625
0.75
1
Figure 5. Design EZ-C Valve Stem Torque and
Pin Replacement
35A5717-C/
DOC
Perform the following steps to remove the valve trim.
Note
With some valve plug sizes and
configurations, the seat ring retainer
and bushing assembly (keys 3 and 26,
figure 7, 8, and 9) will come out of the
valve body with the valve plug and
stem assembly, and in other valve plug
sizes and configurations, the valve
plug will slide through the seat ring
retainer and bushing assembly,
leaving the retainer and bushing
assembly in the valve body.
2. With the valve plug and stem assembly out of the
valve body, either slide the seat ring retainer,
bushing assembly (keys 3 and 26), gaskets, and
shim (keys 10, 12, and 25) up over the valve plug
and stem or, lift the seat ring retainer and bushing
assembly, associated gaskets, and shim out of the
valve body. If the valve plug is to be reused, protect
the valve plug seating surface to prevent damage.
3. To disassemble the stem, plug, and pin, drive or
drill out the pin (key 8) and unscrew the valve stem
(key 7) from the valve plug (key 2).
4. Remove the seat ring and seat ring gasket
(keys 9 and 13).
5. Inspect parts for wear or damage that could
prevent proper operation of the valve. Clean, inspect
and obtain replacement parts as necessary for
reassembly.
Design EZ-C Trim Assembly
This procedure assumes that all the trim and
associated gaskets were removed from the valve
body. If these parts were not all removed, start the
assembly procedure at the appropriate step.
CAUTION
To avoid weakening the stem that may
cause failure in service, never reuse an
old stem with a new valve plug. Using
an old stem with a new plug requires
drilling a new pin hole in the stem,
which will weaken the stem. However,
a used valve plug may be reused with
a new stem.
Key number locations are shown in figure 8, unless
otherwise noted.
1. Screw the valve stem (key 7) into the valve plug
(key 2). Tighten to the torque valve given in figure 5.
Refer to figure 5 to select the proper drill size. Drill
through the stem using the hole in the valve plug as
a guide. Remove any chips or burrs and drive in a
new pin (key 8) to lock the assembly.
2. Install the seat ring gasket (key 13) and seat ring
(key 9).
Note
With some valve plug sizes and
configurations, the valve plug will
slide through the seat ring retainer and
bushing assembly (keys 3 and 26), and
in other configurations, it will not.
3. If the valve plug (key 2) will not slide through the
seat ring retainer and bushing assembly (keys 3
and 26), proceed as follows:
a. Place the seat ring retainer and bushing
assembly (keys 3 and 26) over the stem of the
valve plug and stem assembly.
b. Install the seat ring retainer and bushing
assembly, which also includes the valve plug and
stem assembly, on top of the seat ring, ensuring
that the seat ring retainer slips onto the seat ring
properly. Any rotational orientation of the seat
ring retainer with respect to the valve body is
acceptable.