Emerson FISHER GX Instruction Manual page 5

Instruction Manual
Form 5770
June 2006
remove the cap screw (key 14), actuator spacer
(key 13), actuator rod (key 22), and washer (key 15).
9. Replace the diaphragm (key 10), actuator rod
bushing (key 19), and actuator rod seal (key 20), as
needed.
Actuator Disassembly (For Air-to-Close
Constructions - see figure 17 or 18)
1. Remove the stem connector nut half (key 23),
stem connector bolt half (key 24), and travel
indicator (key 26).
WARNING
To avoid personal injury or property
damage due to actuator springs (key
12) being under compression, remove
the long cap screws (key 16) last.
The upper actuator casing may remain
fixed to the diaphragm and lower
casing during disassembly, even if the
casing cap screws have been
loosened. If this happens, the actuator
springs are still under compression.
The upper casing could suddenly
come loose and jump, due to the
compressed energy of the springs. If
the upper casing is stuck to the
diaphragm and lower casing when you
begin loosening the casing cap
screws, pry the casings apart with a
prying tool. Always ensure that the
springs are dispersing energy and the
upper casing is moving against the
long bolts during disassembly.
2. Remove the short actuator casing cap screws
and hex nuts (keys 17 and 18) first. Once these
have been removed from the actuator assembly,
carefully remove the long actuator cap screws and
hex nuts (keys 16 and 18), alternating between them
to gradually release the spring energy
(compression).
3. Remove the upper diaphragm casing (key 9).
4. Lift off the actuator stem/diaphragm assembly
(includes keys 22, 11, 10, 14, 13, and 15) and
remove the cap screw (key 14), actuator spacer
(key 13), actuator rod (key 22), and washer (key 15).
5. Remove the actuator springs (key 12).
GX Valve and Actuator
Table 2. Design GX Maximum Rated Travel
NUMBER OF
ACTUATOR SIZE
CASING BOLTS
225
750
1200
Table 3. Body Nut (Key 7) Torque Requirements
VALVE SIZE
DN 15, 20, 25
(0.5, 0.75, 1-inch)
DN 40 and DN 50
(1.5 and 2-inch)
DN 80 (3-inch)
DN 100 and DN 150
(4- and 6-inch)
Table 4. Yoke/Extension Bonnet Nut (Key 46) Torque
Requirements (used on Extension Bonnet and Bellows
Bonnet constructions)
VALVE SIZE
DN 15, 20, 25, 40,
and 50 (0.5, 0.75, 1,
1.5, and 2-inch)
DN 80 and 100
(3- and 4-inch)
6. Replace the diaphragm (key 10), actuator rod
bushing (key 19), and actuator rod seal (key 20), as
needed.
Actuator Assembly For Air-to-Open
Constructions (or to Change Action to
Air-to-Open - see figure 15 or 16)
1. Install the diaphragm (key 10) on the diaphragm
plate (key 11). Insert the cap screw (key 14) through
the actuator spacer (key 13) and place this assembly
through the diaphragm/diaphragm plate assembly.
2. Place the washer (key 15) over the center hole of
the diaphragm, so that the convex part of the washer
is facing down toward the diaphragm.
3. Screw the actuator rod (key 22) onto the cap
screw (key 14) and torque to 65.5 NSm (48.3 lbfSft).
Install the actuator stem/diaphragm assembly back
into the actuator yoke (key 8).
4. Place the actuator springs (key 12) onto the
spring locators in the diaphragm plate (key 11).
D For 6-inch size 1200 actuators, place the
actuator springs (keys 12 and 13) onto the spring
locators in the diaphragm plate (key 11). Note that
eight large springs (key 13) should be used with one
installed at the center of the diaphragm plate and
TRAVEL
mm
6 20
10 20
16 40 or 60
TORQUE
NSm lbfSft
38.2 28.2
65.5 48.3
157 116
284 209
TORQUE
NSm lbfSft
65.5 48.3
157 116
5