Emerson Fisher GX Instruction Manual page 16

GX Valve and Actuator

April 2011

For DN150 balanced constructions, two gaskets are required; one between the valve body and guide sleeve, and

the other between the guide sleeve and bonnet. Ensure the gasket seating surfaces are clean and smooth for both

gaskets.

15. Carefully install the bonnet (key 4) onto the valve stem.

16. Install the new packing and the metal packing box parts according to figure 15 for PTFE packing and according to

figure 16 for Graphite ULF packing. Place a smooth‐edged pipe over the valve stem and gently tap each soft packing

part into the packing box. Apply anti‐seize lubricant to the threads and install the packing follower (key 29).

17. Install the locknut (key 28) and stem adjustor nut (key 27).

For standard bonnet constructions, install the valve plug/bonnet sub assembly into the valve body (key 1).

18. Mount the actuator onto the valve and install the body nuts (figures 18, 19, 20, 21 key 7, figures 22 and 23 key

46), but tighten them only finger‐tight.

19. For air‐to‐open, connect a separate air supply to the lower diaphragm casing air supply connection (as shown in

figure 18 or 19) and apply sufficient air pressure to raise the actuator rod (key 22) to the travel stop. Proceed to the

next step.

For air‐to‐close, proceed to the next step.

20. For standard bonnet constructions, tighten the body nuts (key 7) evenly using a cross‐tightening procedure. See

table 4 for torque requirements.

For extension and bellows bonnet constructions, tighten the bonnet nuts (key 46) evenly using a cross‐tightening

procedure. See table 5 for torque requirements.

21. Thread the stem lock adjustor (key 27) up until it is the rated travel distance specified in table 3 from the actuator

rod (key 22). Thread the locknut (key 28) up against the stem locknut and tighten to the torque specified in table 6.

22. 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.

23. Align the pointer of the travel indicator (key 26) with the appropriate mark on the travel scale.

24. Tighten the stem connector cap screws (key 25) to 35 Nxm (26 lbfxft).

Table 9. Seat Ring / Cage Torque Requirements

DN

15, 20, 25

40

50

80

100

150

Table 10. Stem Extension Torque Requirements

DN

15, 20, 25, 40, 50

80, 100

Table 11. Bellows Nut Torque Requirements

DN

15, 20, 25, 40, 50

80, 100

25. Tighten the packing follower (key 29) to the torque specified in table 8.

16

VALVE SIZE

NPS

1/2, 3/4, 1

1‐1/2

2

3

4

6

VALVE SIZE

NPS

1/2, 3/4, 1, 1‐1/2, 2

3, 4

VALVE SIZE

NPS

1/2, 3/4, 1, 1‐1/2, 2

3, 4

Instruction Manual

TORQUE

NSm

170

320

460

1020

1520

3400

TORQUE

Nxm

40

120

TORQUE

Nxm

350

650

D103175X012

lbfSft

124

234

337

747

1113

2500

Lbfxft

30

89

Lbfxft

260

480