Emerson Y690A Manual de instrucciones descargar pdf (Pagina 6)

Y690A Series

in Figures 5, 6, and 7.

1. Remove the cap screws (key 2, Figure 7) and

separate the diaphragm casing (key 4) from the

body (key 1).

2. Remove and inspect the body seal O-ring (key 11)

and the backup ring (key 50). See Figure 4.

3. Inspect and replace the orice (key 5) if necessary.

Protect the orice seating surface during

disassembly and assembly. Lubricate the threads

of the replacement orice with a good grade of light

grease and install with 29 to 37 foot-pounds (39 to

50 N•m) of torque.

4. Remove the cotter pin (key 15) to replace the

disk assembly (key 13) or to inspect the throat

seal O-ring (key 31, Figure 6) on the

Types Y690AM and Y690AHM.

5. To replace the pitot tube (key 32, Figure 5) on

the Types Y690A and Y690AH, remove the pitot

tube screws (key 33), install the new pitot tube,

and secure with the pitot tube screws (key 33).

Position the pitot tube so that it points into the

outlet of the body by rotating the guide insert

(key 18).

6. To inspect the throat seal O-ring (key 31, Figure 6)

on the Types Y690AM and Y690AHM, remove the

machine screw (key 33, Figure 6). Replace if

necessary, and reassemble.

7. Install the disk assembly (key 13) and secure it

with the cotter pin (key 15).

8. Place back-up ring (key 50) into the body (key 1).

Then place the body seal O-ring (key 11) into the

body. See Figure 4.

9. Place the diaphragm casing (key 4) on the body

(key 1). Secure the diaphragm casing to the body

with the cap screws (key 2, Figure 7).

Diaphragm and Spring Case Area

This procedure is for gaining access to the spring,

diaphragm, lever assembly, and stem. All pressure

must be released from the diaphragm casing before

these steps can be performed.

To Change the Control Spring:

Note

Any remote control drive unit used

with a Y690A Series regulator must be

removed from the spring case (key 3)

before these steps can be performed.

1. Remove the closing cap (key 22), and turn the

adjusting screw (key 35) counterclockwise to

remove all the compression from the control

spring (key 6).

2. Change the control spring (key 6) to match the

desired spring range.

3. Replace the adjusting screw (key 35).

4. Install a replacement closing cap gasket (key 25),

if necessary, and reinstall the closing cap (key 22).

5. If the spring range was changed, be sure to

change the stamped spring range on the nameplate.

To Disassemble and Reassemble

Diaphragm Parts:

Key numbers are referenced in Figures 5, 6, and 7.

1. Remove the closing cap (key 22), and turn the

adjusting screw (key 35) counterclockwise to

remove the adjusting screw and the control

spring (key 6).

2. Remove the spring case hex nuts (key 23, not

shown), cap screws (key 24), and spring case

assembly (key 3).

3. Remove the diaphragm (key 10) plus attached parts

by tilting them so that the pusher post (key 8) slips

off the lever assembly (key 16). To separate the

diaphragm (key 10) from the attached parts, unscrew

the spring holder screw (key 38) from the pusher

post (key 8).

4. Inspect the pusher post (key 8) and the post seal

O-ring (key 48), replace if required.

5. Remove hex nut (key 21) to separate the

diaphragm (key 10) and attached parts.

6. To replace the lever assembly (key 16), remove

the machine screws (key 17). To replace the

BODY SEAL

O-RING (KEY 11)

BACKUP RING (KEY 50)

BODY (KEY 1)

Figure 4. Expanded View of the Body Area

Showing the O-ring and Backup Ring Placement

1 2 3 4 5 6 7 8 9 10 11 12

Y690A Series 1

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Emerson Y690A Manual de instrucciones Pagina 6

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