Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
12
table 2. Thread the locknut (key 108) up against the stem extension and tighten to a torque of 48 N•m (35
lbf•ft) for the 10mm stems or 175 N•m (129 lbf•ft) for 14mm stems.
23. Stroke the actuator rod until it contacts the lower stem connector (key 27) or stem extension (key 106, figure 12)
and install the stem connector halves and travel indicator (keys 23, 24, and 26) with the cap screws (key 25). Install
the stem connector halves in the proper orientation so that when looking at the inside of the stem connector
halves, the flats are down and the beveled surfaces are up.
24. Align the pointer of the travel indicator (key 26) with the appropriate mark on the travel scale.
25. Tighten the stem connector cap screws (key 25) to 35 Nm(26lbfft).
26. Tighten the packing follower (key 29) to the torque specified in table 4.
Alternately, the packing follower can be tightened by the following method:
a. Tighten the packing follower until the Belleville springs are compressed 100% (or completely flat), as detected by
a rapid increase in nut torque.
b. Loosen the packing follower 60_ of rotation.
27. For fail-down constructions, release the actuator pressure.
28. For fail-down constructions, ensure the vent (key 21) is installed into the upper diaphragm casing (see figure 11).
29. For fail-up constructions, ensure the vent (key 21) is installed into the actuator yoke air supply connection. See
figure 8.
Replacing Packing (Electric Actuators)
Isolate the control valve from the line pressure, release pressure from all three inlets/outlets of the valve body and
drain the process media from the valve. Use lock-out procedures to ensure that the above measures stay in effect
whileyouworkontheequipment.
1. Stroke the actuator so the valve plug/stem (key 3) is at mid travel.
2. Remove the stem connector nut half (key 23), stem connector bolt half (key 24), and travel indicator (key 26).
3. Use precaution to ensure the actuator is locked in position and cannot stroke.
4. Mark the position of the locknut (key 28) on the stem for reassembly.
5. Push the valve plug stem (key 3) down until it contacts the lower seat.
6. 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).
WARNING
To avoid personal injury or property damage by uncontrolled movement of the actuator yoke (key 8), loosen the body/yoke
nuts (figure 11, key 7) by following the instructions in the next step. Do not remove a stuck actuator yoke by pulling on it
with equipment that can stretch or store energy in any other manner. The sudden release of stored energy can cause
uncontrolled movement of the actuator yoke.
Note
The following step also provides additional assurance that the valve body fluid pressure has been relieved.
(36 paginas)
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