Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
5
Table 2. Fisher GX 3-Way Rated Travel
VALVE SIZE
ACTUATOR SIZE
NUMBER OF CASING
BOLTS
TRAVEL STEM CONNECTOR GAP SETTINGS
NPS mm mm
1, 1-1/2 225 6 19 21
2 750 10 19 21
3, 4 750 10 38 40
Table 3. Body Nut (Key 7) Torque Requirements
VALVE SIZE
TORQUE
NSm lbfSft
DN 25 and 40 (NPS 1 and 1-1/2) 79.8 58.9
DN 50 (NPS 2) 163 120
DN 80 and 100 (NPS 3 and 4) 282 208
Note
Whenever a gasket seal is disturbed by removing or shifting gasketed parts, install a new gasket during reassembly. This ensures a
good gasket seal because the used gasket may not seal properly.
Actuator Maintenance
For electric actuators, see the supplier's instruction manual.
The following sections provide procedures for actuator maintenance. Refer to figures 8 and 11.
The actuator soft parts may require periodic replacement. This includes the diaphragm (key 10), diaphragm O-ring
(key 109), actuator rod bushing (key 19), and the actuator rod seal (key 20).
If the actuator stroking direction is unknown, refer to the nameplate on top of the actuator casing and figure 2.
Note
When the GX 3-Way actuator is equipped with the integrated FIELDVUE DVC2000 digital valve controller (figure 1), additional
considerations may be required. Refer to the FIELDVUE DVC 2000 Digital Valve Controller instruction manual, D103176X012, for
mounting instructions.
Actuator Disassembly (For Fail-Down Constructions, see figure 11)
1. Connect a separate air supply to the lower diaphragm casing via the air supplyconnectionontheyoke(asshownin
figure 11) and apply sufficient air pressure to raise the valve plug/stem off the lower seat to mid-travel.
2. Remove the stem connector nut half (key 23), stem connector bolt half (key 24), and travel indicator (key 26).
3. Push the valve plug/stem (key 3) down until it contacts the seat.
4. Loosen the locknut (key 28) and thread the lower stem connector (key 27) down until it clears the top of the valve
plug/stem (key 3).
D For HT construction, loosen locknut (key 108) and thread the stem extension (key 106) down as far as possible
(see figure 12).
(36 pages)
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