Instruction Manual
D103175X012
GX Valve and Actuator
July 2017
10
2. Install the diaphragm (key 10) on the diaphragm plate (key 11). Place the diaphragm O-ring (key 109) and 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 and contains the O-ring. Ensure the convex part of the washer is guided in the diaphragm center
hole as shown in figure 20 or 21.
3. Insert the cap screw (key 14) through the washer and diaphragm, install the actuator spacer (key 13), and screw the
actuator rod (key 22) onto the cap screw (key 14) finger‐tight.
4. Radially align the spring locators in the diaphragm plate assembly (key 11) with the casing cap screw holes in the
diaphragm (key 10). This will ensure that the springs do not cover the air path in the yoke.
5. Torque the cap screw (key 14) to the actuator rod (key 22) to 80 NSm (59.1 lbfSft) and lay this assembly into the
upper diaphragm casing (key 9).
6. Place the actuator springs (key 12 and/or 82) onto the spring locators in the diaphragm plate (key 11). See figure 3
and table 2 for proper spring quantity and arrangement.
D If the nameplate does not contain spring information, use the same quantity and arrangement as originally
installed.
7. Remove and replace the actuator rod bushing (key 19) and actuator rod seal (key 20) in the actuator yoke (key 8), if
necessary.
8. Set the actuator yoke (key 8) down onto the assembly that is resting in the upper diaphragm casing (key 9) so that
the yoke legs are perpendicular with the ribs on the top of the upper diaphragm casing (key 9).
D For size 225 and 750 actuators, install the 2 long cap screws (key 16) and hex nuts (key 18) 180 degrees apart from
each other and in line with the actuator yoke legs.
D For size 1200 actuators, install the 4 long cap screws (key 16) and hex nuts (key 18) 90 degrees from each other,
with two of them in line with the actuator yoke legs.
9. 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.
10. Install the remaining short cap screws (key 17) and hex nuts (key 18) to the casing.
11. Tighten the actuator casing cap screws evenly using a cross‐tightening procedure. Torque to 55 NSm (40 lbfSft).
12. If you had previously removed the actuator assembly from the valve, place the actuator assembly back onto the
valve body (key 1). For standard bonnet constructions (figures 18, 19, 20, and 21), install the body nuts (key 7) and
tighten evenly using a cross‐tightening procedure. See table 4 for torque requirements.
For extension and bellows bonnet constructions (figures 22 and 23), install the bonnet nuts (key 46) and tighten
evenly using a cross‐tightening procedure. See table 5 for torque requirements.
13. With the valve plug/stem (key 3) in the closed position (on the seat), thread the stem adjustor nut (key 27) up until
it is at the rated travel (see table 3) from the actuator rod (key 22). Thread the locknut (key 28) up against the stem
locknut and tighten per table 6.
14. Stroke the actuator rod until it contacts the stem adjuster nut (key 27) 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 (26 lbfSft).
Note
For air‐to‐close action, the air supply tubing must be connected to the actuator upper casing at the air supply connection, see
figure 20 or 21. (If converting from air‐to‐open to air‐to‐close, the tubing will need to be re‐routed to this location).
To Next Page
Loading...
Need help?
General
