Instruction Manual

Instruction Manual
D100390X012
ED Valve
October 2014
10
Figure 5. Graphite Ribbon/Filament Packing for Plain or Extension Bonnets
NOTES:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS; USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
PACKING
FOLLOWER (KEY 13)
GRAPHITE RIBBON
PACKING RING (KEY 7)
PACKING BOX
RING (KEY 11)
LANTERN RING (KEY 8)
GRAPHITE FILAMENT
PACKING RING
(KEY 7)
PACKING
FOLLOWER (KEY 13)
GRAPHITE RIBBON
PACKING RING (KEY 7)
PACKING BOX
RING (KEY 11)
LANTERNRING(KEY8)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
1
1
1
1
1
1
1
1
SINGLE ARRANGEMENTS DOUBLE ARRANGEMENTS
9.5 mm
(3/8-INCH)
STEM
12.7 mm
(1/2-INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4,1,OR1-1/4INCH)
STEM
9.5 mm
(3/8-INCH)
STEM
12.7 mm
(1/2-INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4,1,OR1-1/4INCH)
STEM
B2350
14A3411-C 13A9775-E 13A9776-D
14A2153-D 14A1849-E 14A1780-D
Trim Maintenance
WARNING
Observe the warning at the start of the Maintenance section.
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 19 for standard NPS 1 through 6
constructions, figure 20 for Whisper Trim III cage detail, figure 21 for the NPS 8 ED valve, and figures 22 and 2 3 for
WhisperFlo trim. Some valve plug constructions require three piston rings (key 6).
Disassembly
1. Remove the actuator and the bonnet according to steps 1 through 5 of the Replacing Packing procedure in the
Maintenance section.
WARNING
Avoid personal injury or property damage from valve or packing leakage.
The graphite piston rings in an ED or EAD valve are brittle and in two pieces. Use care to avoid damage to the piston rings
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
criticalformakingagoodpackingseal.Theinsidesurfaceofthecageorcage/baffleassembly(key3),orcageretainer(key
31), is critical for smooth operation of the valve plug and for making a seal with the piston rings (key 6). The seating
surfaces of the valve plug (key 2) and seat ring (key 9) are critical for proper shutoff. Protect these parts accordingly while
disassembling the trim.
2. Remove the packing flange nuts, packing flange, upper wiper, and packing follower (keys 5, 3, 12, and 13, figure
18). 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.