Emerson Fisher GX Manual de Instruções descarregar pdf (Página 8)

Instruction Manual

D103312X012

GX 3-Way Valve and Actuator

August 2011

Actuator Assembly (For Fail-Up Constructions, see figure 8)

1. Position the upper diaphragm casing (key 9) upside down on the bench so that it lays flat and not off balance.

Note

If converting from fail-down to fail-up action, first move the vent cap (key 21) from the top of the casing (see figure 8) and thread

into the air supply connection on the yoke leg (see figure 11).

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

holeasshowninfigure8.

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 80.0 NSm (59.1 lbfSft) and lay this assembly into the

upper diaphragm casing (key 9).

6. Place the actuator springs (key 12) onto the spring locators in the diaphragm plate (key 11).

7. 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).

8. 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.

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(40lbfSft).

12. 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 construction. Install the body nuts (key 7) and

tighten evenly using a cross-tightening procedure. See table 3 for torque requirements.

D For HT constructions, see figure 12. Ensure the valve body nuts (key 7) are tightened at the valve body (key 1)

and at the top of the yoke extension (key 105).

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 adjustor nut specified in table 2. Thread the locknut (key 28) up against

the stem locknut and tighten to a torque of 48 NSm(35lbfSft) for 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 stem extension (key 106, figure 12),

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.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

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Emerson Fisher GX Manual de Instruções Página 8

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