Emerson 92C Manual de instrucciones descargar pdf (Pagina 10)

Type 92C

WARNING

Avoid personal injury or property damage

from sudden release of pressure or

uncontrolled steam or other process

uid. Before starting disassembly:

• Isolate the regulator from the process,

• Release process pressure, and

• Vent the pilot supply and main valve

loading pressures.

This section contains separate procedures for regulator

and pilot maintenance.

Type 92C Regulator

Perform these procedures when replacing diaphragm,

the stem assembly, the valve plug, or the orice. Refer

to the correct section for the required instructions. Key

numbers refer to Figure 8 unless otherwise indicated.

The regulator may remain in the pipeline during

maintenance procedures unless the valve body is to

be replaced or removed for repairs. For pilot-operated

regulators, the pilot may remain on the pipe nipple

(key 23, Figure 10) unless the pilot body (key 1,

Figure 9) is to be removed or the entire pilot replaced

as a unit.

Replacing Diaphragm and Stem Assembly

1. For the pilot-operated regulator, unscrew the

elbow and connector (keys 25 and 24, Figure 10)

so that the loading tubing (key 22, Figure 10) can

be removed.

For the pressure-loaded regulator, unscrew

the loading tubing (customer supplied) from the

1/4 NPT connection in the regulator diaphragm

ange (key 2).

2. Remove the cap screws (key 12) and the diaphragm

ange (key 2).

Lift out the upper diaphragm gasket (key 9), the

diaphragms (key 8), the lower diaphragm gasket,

and for Steel/Stainless Steel constructions, the

diaphragm ring (key 15), and another diaphragm

gasket (key 9).

3. Lift out the stem assembly (key 11) consisting of

the pusher plate and the stem. Check that the

pitot tube (key 10) is clear and free of obstructions.

Clean the parts. Check for wear, scratches, nicks

and other damage, and replace parts as necessary.

4. Install the stem assembly (key 11) in the stem

guide bushing (key 6). Place one diaphragm

gasket (key 9) in the regulator body (key 1).

For Steel/Stainless Steel constructions, place the

diaphragm ring (key 15) and another diaphragm

gasket (key 9) on top of the rst gasket.

For all constructions, place the two molded

diaphragms (key 8) with the raised circle up,

another diaphragm gasket, and the diaphragm

ange (key 2) on the body. Insert and tighten the

cap screws (key 12).

5. For the pilot-operated regulator, reconnect

the elbow, the loading tubing, and the connector

(keys 25, 22, and 24, Figure 10).

For the pressure-loaded regulator, reconnect

the pressure-loading tubing.

6. When maintenance is completed, refer to the

Startup section to put the regulator back in

operation and to adjust the pressure setting.

Replacing Valve Plug and Orice

1. Remove the valve plug guide (key 5).

2. Remove the valve plug (key 4) and the valve

plug spring (key 7). Inspect the valve plug

seating surface for nicks or scratches. Replace

as necessary.

3. Unscrew the orice (key 3), and inspect the

seating surface for nicks and scratches. Replace

if necessary.

4. Clean the valve plug guide, the valve plug, the

valve plug spring, and the orice (keys 5, 4, 7,

and 3, respectively).

5. Coat the orice threads with Never-Seez* or

equivalent lubricant. Then, being careful not to

damage the seating surface, thread the orice

(key 3) into the regulator body (key 1).

6. Place the valve plug spring (key 7) into the

valve plug guide (key 5). Then slide the valve

plug (key 4) over the spring and into the valve

plug guide.

7. Apply Lok-Cease 20/20

†

sealant or equivalent

to the valve plug guide threads, and screw the

valve plug guide (key 5) with attached parts

into the regulator body (key 1), applying 130 to

160 foot-pounds / 176 to 217 N•m of torque.

* Trademark of Never-Seez Corp.

† Trademark of Certied Laboratories

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

Type 92C Steam Regulator 1
Type 92C 10

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