Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
9
15. Align the pointer of the travel indicator (key 26) with the appropriate mark on the travel scale.
16. Tighten the stem connector cap screws (key 25) to 35 NSm(26lbfSft).
Note
For fail-up action, the air supply tubing must be connected to the actuator upper casing at the air supply connection, see figure 8.
(If converting from fail-down to fail-up, the tubing will need to be re-routed to this location).
Packing Maintenance
Key numbers refer to figure 7.
Packing Adjustment
For spring-loaded single PTFE V-ring packing (figure 7) or for graphite ULF packing (figure 7), the Belleville spring pack
(key 34) maintains a sealing force on the packing. If leakage is detected around the packing follower (key 29) check to
be sure that the packing follower (key 29) is tight. Using a wrench, tighten the packing follower (key 29) in 1/4 turn
intervals until the leakage is stopped. If leakage cannot be stopped in this manner, proceed to the Replacing Packing
sectioninthismanual.
Replacing Packing (Pneumatic 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. Shut off all pressure lines to the actuator and release all pressure from the
actuator. Use lock-out procedures to ensure that the above measures stay in effect while you work on the equipment.
1. For fail-down constructions, as shown in figure 11:
a. Connect a separate air supply to the lower diaphragm casing via the air supply connection on the yoke (as shown
in figure 11) and apply sufficient air pressure to raise the valve plug/stem off the lower seat to mid travel.
b. Remove the stem connector nut half (key 23), stem connector bolt half (key 24), and travel indicator (key 26).
c. Push the valve plug stem (key 3) down until it contacts the lower seat.
d. 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).
e. Shut off the air pressure and disconnect the separate air supply to the lower diaphragm casing (as shown in figure
11).
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.
(36 Seiten)
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