2700A — ©2015, February, 2015
P.O. Box 40525, Houston, Texas USA 77240-0525
Tel: 713·466·3552 · Fax: 713·896·7386
www.norriseal.com
O
PERATING AND
M
AINTENANCE
M
ANUAL
Series 2700A Control Valve
valve stem. Screw the adapter
onto the stem until the pin hole
in the adapter is aligned with the
hole through the stem. Insert a
3/16” diameter pin and drive it
into place until the pin is flush
with the stem adapter.
The ends of the pin must not stick out
beyond the outer surface of the stem
adapter.
Replace valve plug on the stem
adapter. Screw the plug onto the
diaphragm until the pin holes are
aligned. Insert 1/8” diameter roll
pin to secure the plug.
Install the new gasket into the
seat pocket in the body.
For a valve body size of 2,” skip
to step 6. For a body size of 3”
and 4,” reinstall the body adapt-
er in the proper position on top
of the gasket in the pocket. In-
stall a new O-ring in the body
adapter groove.
Install a new O-ring in the groove
near the bottom of the seat/
cage. Reinstall the seat/cage
into the seat adapter. Light hand
pressure will be required for this.
Re-install the seat/cage with the
seat adapter into the valve body.
Install the valve stem, with
stem adapter and plug, upward
through the bottom of the adapt-
er. The plug will stop against the
surface in the adapter.
Carefully insert the stem upward
through the bottom of the bonnet
so that the end of the stem slides
through packing and out through
the retainer at the top of the
bonnet.
Page 7 of 12
Insert the roll pin until it is flush
with the outside diameter of the
plug.
Install the new seat gasket into
the seat cavity in the body’s
bridgewall.
Install the seat ring into the
body’s seat cavity.
Install the new bonnet gasket
into the top valve body overhand
recess.
Mount the bonnet and trim
assembly onto the body.
Tighten the bonnet-to-body
bolts to the recommended
torques given in Table 4A or 4B,
which identifies valve size and
recommended torque valves in
foot pounds. Tighten the nuts in
across pattern in 25, 50, 75 and
100% increments of the final
torque values.
Mount the diaphragm on
the bonnet and connect the
diaphragm stem to the valve
stem.
2.8 Valve Reassembly
(Reduced Unbalanced
Plug Control Trim)
If the packing is to be reused and was
not removed from the bonnet, use care
when installing the stem in the bonnet
to avoid damaging the packing with the
valve stem threads.
NOTE: The following procedure applies
only to valve body sizes of 2,” 3” and
4.”
Begin by performing Steps 1 and
2 in 2.8A for balanced trim.
Replace the stem adapter on the
CAUTION!
CAUTION!
CAUTION!
Reinstall the stem connector to
connect the valve stem to the
diaphragm stem.
Complete
the
reassembly
process by performing Steps
11, 12 and 13 above.
2.8 Valve Reassembly
(Balanced Cage Control Trim)
If the packing is to be reused and was
not removed from the bonnet, use care
when installing the stem in the bonnet
to avoid damaging the packing with the
valve stem threads.
NOTE: Use all new gaskets and seals
for reassembly.
Clean all gasketed surfaces,
including the body, bonnet and
guide.
A light coat of lubricant may be
used on soft seals to aid ease of
assembly.
Install the plug and seal assem-
bly on the stem by screwing the
plug onto the valve stem until the
hole in the plug top aligns with
the hole in the valve stem.
Insert the roll pin through the
plug and into the stem until it is
flush with the plug.
Install the plug O-ring with a
backup ring on each side of the
O-ring in the plug’s groove.
Install the piston bearing ring in
the plug’s top groove.
Push the stem through the
bonnet packing, taking care not
to damage the packing. Tighten
the packing gland.
8.
3.
10.
1.
2.
3.
4.
5.
6.
7.
11.
10.
5.
11.
6.
12.
8.
9.
9.
4.
13.
7.
14.
1.
2.
