Jordan Valve Mark 128PQC Series Control Valve User Manual
Page 3
M
ark
128PQC S
erieS
C
ontrol
V
alVe
-3-
Replacing Packing and Trim continued,
3.
Accessible areas should be cleaned at this
stage, and all necessary maintenance perf-
ormed. The actuator and attached trim parts
can be turned over and held by the valve body.
4.
To separate trim and access packing parts or
seal O-rings, first loosen and remove the valve
plug (Key 25) and remove the packing box
washer (Key 27).
5.
Remove the packing box (Key 28), O-ring
retainer (Key 18), stem O-ring (Key 19) and
diaphragm casing O-ring (Key 31) off the stem.
6.
Install replacement parts as necessary.
6.1.
If a complete packing and trim assem-
bly is being installed, remove the as-
sembly from the tube (Key 37), keepi-
ng the web sleeve (Key 39) on the
assembly so the parts remain in place.
Roll the sleeve back as necessary dur-
ing
installation.
6.2.
Continue pushing the assembly onto
the stem until the valve plug and cage
are pushed away from the packing box
washer or wiper ring. Roll the web
sleeve back into place just past the
packing
box.
6.3.
If installing nitrile/cotton packing, the
packing rings may be lubricated with
silicon based product.
7.
Slide the packing box onto the stem until the
packing box, the O-ring (Key 19) and the O-
ring retainer (Key 18) and the diaphragm casi-
ng O-ring (Key 31) are sealed against the dia-
phragm casing.
7.1.
Ensuring proper positioning of the O-
rings will prevent them from being cut
when other parts are compressed
against
them.
7.2.
Advance the packing spring washer
(Key 29) , packing spring (Key 21),
second packing spring washer, wiper
ring and packing box washer
(Key 27, if included in the assembly)
down onto the stem.
8.
For installation of the packing and trim as
sembly, it is necessary to remove the sleeve,
cage puller (Key 40) and cage (Key 23) from
the valve plug depending on individual valve
configuration.
9.
Fix the valve plug onto the stem, rotating the
plug until the shoulder makes snug contact
with the stem. No further tightening is neces-
sary.
10.
To replace the cage or access the cage O-ring
(Key 22), remove the cage from the body (Key
26) using the cage puller or a wire hook. Re-
placement parts can be installed as necessary.
11.
Attach the actuator and trim to the valve body
(Key 26), paying special attention to the cage
O-ring to prevent damage. Thread the four
nuts (Key 32) to the lower diaphragm casing
assembly screws. Nuts must be tightened to
15-foot-pounds (20N•m).
12.
Reconnect the input signal tubing to the actua-
tor connection of the appropriate diaphragm
casing.
Figure 2: Replacement Packing and Trim
Assemblies for Metal Seated Constructions
37
19
30
28
21
38
25
23
40
22
27
29
39
20
31
18