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install the body nuts (key 7) and tightenevenly 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 closedposition (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 stemadjuster nut (key 27) and install the stem connectorhalves and travel indicator (keys 23, 24, and 26) withthe cap screws (key 25). Install the stem connector halves in the proper orientation so that when lookingat the inside of the stem connector halves, the flatsare 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 N

Instruction Manual

February 2009

GX Control Valve and Actuator System - 14722 GX Valve and Actuator

and screw the actuator rod (key 22) onto the capscrew (key 14) finger-tight.4. Radially align the spring locators in thediaphragm plate assembly (key 11) with the casing cap screw holes in the diaphragm (key 10). This willensure that the springs do not cover the air path inthe yoke.5. Torque the cap screw (key 14) to the actuator rod(key 22) to 65.5 N m (26 lbf ft).17. m (48.3 lbf ft) and lay thisassembly 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. Note: For air-to-close action, the air supplytubing must be connected to the actuator uppercasing at the air supply connection, see figure 20 or 21. (If converting from air-to-open toair-to-close, the tubing will need to be re-routedto this location). If the nameplate does not contain springinformation, use the same quantity and arrangementas originally installed.7. Remove and replace the actuator rod bushing(key 19) and actuator rod seal (key 20) in theactuator yoke (key 8), if necessary.8. Set the actuator yoke (key 8) down onto theassembly that is resting in the upper diaphragmcasing (key 9) so that the yoke legs areperpendicular with the ribs on the top of the upper diaphragm casing (key 9). For size 225 and 750 actuators, install the 2long cap screws (key 16) and hex nuts (key 18) 180degrees apart from each other and in line with theactuator yoke legs. For size 1200 actuators, install the 4 long capscrews (key 16) and hex nuts (key 18) 90 degrees from each other, with two of them in line with theactuator yoke legs.9. Tighten the long cap screws (key 16) and hexnuts (key 18), alternating between them to graduallycompress 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 evenlyusing a cross-tightening procedure. Torque to 55N

FIELDVUE DVC2000 Digital ValveController Mounting

This section provides instruction on mounting theFIELDVUE DVC2000 Series digital valve controller to the GX control valve. For further detail on theoperation and maintenance of the DVC2000, refer tothe DVC2000 instruction manual.The FIELDVUE DVC2000 Series digital valvecontroller mounts directly to an interface pad on theGX actuator yoke leg, eliminating the need formounting brackets (see figure 1). Internal passageways in the actuator route the pneumaticoutput to the actuator casing, which eliminates theneed for external air supply tubing in the air-to-open (spring-to-close) constructions. (The GX will alsoaccommodate other valve positioners, using theNAMUR mounting pads on the side of the yoke legs.) m (40 lbf ft).12. If you had previously removed the actuatorassembly from the valve, place the actuatorassembly back onto the valve body (key 1). Forstandard bonnet constructions (figures 18, 19, 20, and 21),
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