P.O. Box 40525, Houston, Texas USA 77240-0525
Tel: 713·466·3552 · Fax: 713·896·7386
www.norriseal.com
2700A — ©2015, February, 2015
O
PERATING AND
M
AINTENANCE
M
ANUAL
Series 2700A Control Valve
a. Place O-ring into cavity of
plug butt.
b. Install the insert into the
butt and recess.
c. Install plug retainer,
pushing the locating boss
through the insert and
O-ring.
d. Install the socket head
cap screw and torque ½”
screws to 60 ft lbs and ¾”
screws to 125 lbs.
Reassemble guide, cage and
plug assembly:
a. Place upper plug guide
upside down on a flat
surface. Place the seal
rings into the guide
recess.
b. Place the cage into the
upper plug guide recess
with the extended
lip down.
c. Insert the valve plug with
the stem thread down
into the cage/guide. Press
the plug downward into
the lower cage through
the seals. A block of wood
may be necessary to drive
the plug downward until
the large portion of the
valve plug (shoulder) bot-
toms on the internal
recess of the cage.
Place the guide gasket over the
valve stem to make the seal
between the bonnet and upper
guide.
Install the plug/cage/guide and
gasket assembly on the stem by
screwing the plug into the valve
stem clockwise until the hole in
the plug top aligns with the hole
in the valve stem.
2.6 Replacement of Valve
Compression Packing
(Adjustable)
Remove two nuts retaining the
packing compressor bar and lift
the compressor bar and retainer
from the bonnet. Pull the old
packing with a hook. Note: Be
careful to avoid scratching the
packing box tool or stem. If the
stem has been removed, the
packing may also be pushed out
using a rod inserted into the hole
at the bottom of the bonnet.
Clean the packing box and all
metal parts.
Install the new packing and parts
in the following sequence:
a. Lower packing washer
b. Three packing rings
c. Lantern ring
d. Six packing rings
e. Packing retainer
f. Packing compressor bar
g. Two 3/8” nuts
Replace the valve plug/stem
assembly and install the bonnet
on the body using new gaskets.
Compress the packing by
tightening the two 3/8” nuts. If
the compressor bar bottoms out
on the bonnet when the nuts are
tightened, remove the two nuts
and lift the compressor bar and
retainer and add one or two
additional rings of packing. This
allows future adjustment of the
bar.
Lubricate the packing, if possi-
ble, by following the instructions
in Paragraph 2.7.
2.7 Packing Lubrication
A lubricator valve is provided as
an option with adjustable packing
valves.
To operate the lubricator, first open
the isolation valve and then turn
the cap screw clockwise to force
the lubricant into the packing box.
Close the isolation valve again after
lubrication is complete.
To recharge the lubricator, make sure
the isolation valve is closed, remove
the cap screw and inject the lubricant
into the assembly. Reinstall the cap
screw.
Norriseal recommends the use of
Dow-Corning #111 Silicon, Norriseal
part number 416744.
2.8 Valve Reassembly
(Balanced Plug Control Trim)
If the packing is to be re-used and was
not removed from the bonnet, use care
when re-installing the bonnet to avoid
damaging the packing with the valve
stem threads.
NOTE: Use all new gaskets and seals
for reassembly.
Clean all gasket surfaces, includ-
ing the body, bonnet and guide.
A light coat of lubricant, such as
light oil, may be used on the soft
seals to aid ease of assembly.
Push the stem through the
bonnet packing, taking care not
to damage the packing.
Assembly of the plug with insert
(for assembly of the solid plug
without the insert, go directly to
Step 5).
1.
1.
2.
3.
4.
2.
5.
3.
6.
7.
4.
5.
6.
Page 6 of 12
CAUTION!
