-8-
Mark EWT – Spring Loaded Seal Ring Continued,
d.
To install the seal ring on a valve plug with
5-3/8-inches (136.5 mm) port diameter
or less, first slide the seal ring (Key 48) onto the
valve plug, followed by the metal back-up ring
(Key 51). Then install the retaining ring (Key 47),
inserting one end into the groove, turning the
plug to press the entire ring into the groove.
Use caution so as to avoid scratching the ring
or plug surfaces.
e.
For installation of the seal ring onto a valve plug
with a port diameter of 7-inches (178 mm) or
greater, apply lubricant and gently stretch the
seal ring over the top edge of the valve plug.
Allow time for the TFE material to cold-flow during the
procedure, so avoid jerking on the ring. The seal ring
may seem loose when first in the groove, but will con-
tract shortly after placement in the cage.
Note: Do not reuse an old stem or connection stud
with a new valve plug. If this were to be attempted,
a new groove pin hole would need to be drilled into
the stem, which weakens the stem and may cause it
to fail in service. However, a used valve plug may be
reused with a new stem.
f.
When replacing the Mark EWD, EWS and EWT
valve stem (Key 30), drive out the groove pin
(Key 31) and unscrew the stem from the
valve plug.
g.
Tightly turn in the new valve stem and refer to
Table 5 for the correct drill size. Use the
hole in the valve plug as a guide
and drill through the stem. Remove any
chips or burrs and drive in the new groove pin,
locking the assembly.
Trim Replacement
Key numbers in this section are referenced in Figures as
follows:
•
Figure 3 for Mark EWD
•
Figure 3 for Restricted Trim Detail
•
Figure 5 for Class 900 8 x 6-inch and Mark
EWT constructions
1.
With a restricted-trim seat ring construction,
install the adaptor gasket (Key 37) and seat ring
adaptor (Key 28).
2.
Install the seat ring gasket (Key 36), seat ring or
liner (Key 32) or disc seat (Key 44).
3.
With TFE-seat construction, install the disc and
disc retainer (Keys 43 and 45).
4.
Install the cage assembly (Key 26). The cage
can be oriented in any rotation with respect to
the valve body.
5.
Slide the valve plug (Key 25) and stem assem-
bly into the cage, ensuring that the piston ring or
seal ring (Key 29 or 48) is placed evenly
in the entrance chamber at the top of the cage
(Key 26) or cage retainer (Key 53). This
will avoid damage to the ring.
6.
Place the gaskets (Keys 35, 34 or 37 if used,
and 33) and shim (Key 53) on top of the
cage or cage retainer. If there is a cage
adaptor (Key 27) or a bonnet spacer (Key 54)
place an additional flat sheet gasket on
the retainer or spacer.
Note: If reusing the packing, and if it has not been re-
moved from the bonnet, use caution when installing
the bonnet to avoid damage to the packing from the
valve stem threads.
7.
Mount the bonnet onto the valve body and
complete assembly procedures according to
Steps 13 through 17 of the Replacing Packing
section. If new packing is not being installed,
omit Steps 14 and 15. Be sure to review
the “Note” prior to step 13.
Parts Ordering
Each Jordan Valve body-bonnet assembly has a se-
rial number which can be found on the valve body. The
same number will appear on the nameplate when the
body assembly is shipped from the Jordan Valve manu-
facturing facility as part of a control valve assembly.
Refer to this serial number when contacting your Jordan
Valve representative.
When ordering replacement parts, refer to the part num-
ber for each part required, according to the following
parts list.
M
ark
EW S
EriES
G
lobE
S
tylE
C
ontrol
V
alVES