Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
7
Actuator Assembly (For Fail-Down Constructions, see figure 11)
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 diaphragm O-ring (key 109) and the washer (k ey 15) over the center hole of the diaphragm, so that the
convex part of the washer is facing down toward the diaphragm and contains the O-ring. Ensure the convex part of
the washer is guided in the diaphragm center hole as shown in figure 11.
3. Screw the actuator rod (key 22) onto the cap screw (key 14) and torque to 80.0 NSm (59.1 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).
5. Install the upper diaphragm casing (key 9) so that the ribs on the top of the upper diaphragm casing are
perpendicular with the yoke legs.
6. Install the 2longcap screws (key 16) and hex nuts (key 18) 180 degrees apart from each other and in line with the
actuator yoke legs.
7. Tighten the long cap screws (key 16) and hex nuts (key 18), alternating between them to gradually compress the
springs, until the two casing halves and diaphragm touch.
8. Install the remaining short cap screws (key 17) and hex nuts (key 18) to the casing.
9. Tighten the actuator casing cap screws evenly using a cross-tightening procedure. Torque to 55 NSm(40lbfSft).
10. If you had previously removed the actuator assembly from the valve, place the actuator assembly back onto the
valve body (key 1) or yoke extension (key 105, figure 12) for HT constructions. Install the four body nuts (key 7), but
tighten them only finger-tight.
11. Connect a separate air supply to the actuator air supply connection (as shown on the yoke in figure 11) and apply
sufficient air pressure to raise the actuator rod (key 22) to the travel stop.
12. Tighten the body nuts (key 7) evenly using a cross-tightening procedure. See table 3 for torque requirements.
D For HT constructions, the valve body nuts (key 7) are tightened at the valve body (key 1) and at the top of the
yoke extension (key 105), see figure 12.
13. With the valve plug/stem (key 3) on the lower seat, thread the lower stem connector (key 27) up to match the gap
setting between the actuator rod and stem adjuster nut specified in table 2. Thread the locknut (key 28) up against
the stem adjustor nut and tighten to a torque of 48 NSm(35lbfSft) for the 10mm stems or 175 NSm (129 lbfSft) for
14mm stems.
D For HT constructions see figure 12. With the valve plug/stem (key 3) on the lower seat, thread the stem
extension (key 106) up to match the gap setting between the actuator rod and stem extension specified in
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.
14. Stroke the actuator rod until it contacts the lower stem connector (key 27), or the stem extension (key 106, figure
12) for HT construction, 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.
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).
17. Release the actuator pressure.
(36 Seiten)
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