EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
10
Table 5. Design ET-C and EWT-C Valve Stem Torque and Pin Replacement
VALVE STEM DIAMETER
VALVE STEM DIAMETER
TORQUE, MINIMUM TO MAXIMUM
DRILL SIZE, INCHES
mm
Inches
N
S
m
Lbf-ft
9.5
3/8
40-47
25-35
3/32
12.7
1/2
81-115
60-85
1/8
19.1
3/4
238-339
175-250
3/16
25.4
1
421-482
310-355
1/4
31.8
1-1/4
827-908
610-670
1/4
c. Place the spiral wound gasket, shim, and
bonnet gasket (keys 12, 25, and 10) on the
shoulder of the seat ring retainer.
4. If the valve plug (key 2) will slide through the seat
ring retainer and bushing assembly (keys 3 and 26),
proceed as follows:
a. Install the seat ring retainer and bushing
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.
b. Place the spiral wound gasket, shim, and
bonnet gasket (keys 12, 25, and 10) on the
shoulder of the seat ring retainer.
c. Slide the valve plug and stem assembly or the
valve plug guide and stem assembly into the seat
ring retainer and bushing assembly (keys 3
and 26).
5. Mount the bonnet on the valve body and
complete assembly using the Replacing Packing
procedures in the Maintenance section.
6. If the valve has soft metal-to-metal seats, refer to
the Coining Soft Metal-to-Metal Seats section.
Design ET-C and EWT-C Trim
Disassembly
Key number locations are shown in figure 9, unless
otherwise noted.
1. Remove the actuator and the bonnet according to
steps 1 through 9 of the Replacing Packing
procedure in the Maintenance section.
WARNING
To avoid personal injury due to leaking
fluids, avoid damaging gasket sealing
surfaces.
The surface finish of the valve stem
(key 7) is critical for making a good
packing seal.
The inside surface of the cage (key 3)
is critical for tight shutoff and smooth
operation of the valve plug.
The seating surfaces of the valve plug
(key 2) and seat ring (key 9) are critical
for proper shutoff.
Protect these surfaces accordingly.
Perform the following steps to remove the valve trim.
2. Remove the load ring (key 26) from an 8-inch
Design ET-C or 10X8 EWT-C valve, and wrap it for
protection.
3. Remove the plug and stem assembly from the
valve body. The cage (key 3) might come out of the
valve body with the plug, due to seal ring friction.
a. If so, carefully separate the cage from the plug
and stem assembly.
b. If the cage was not removed from the valve
body with the plug and stem assembly, remove it,
the associated gaskets (keys 10 and 12), and
shim (key 51).
4. Remove the seat ring (key 9) and seat ring
gasket (key 13). Composition seat constructions use
a disk (key 23) sandwiched between a disk seat
(key 22) and disk retainer (key 21).
5. Clean, inspect, and if necessary obtain
replacement parts.