Emerson LR128 Manual de Instruções descarregar pdf (Página 12)

Type LR128

B2615

INDICATOR

PROTECTOR

(KEY 22)

HEX NUTS

(KEY 4)

BONNET

(KEY 2)

O-RING

(KEY 28)

MAIN SPRING

(KEY 12)

CAP SCREWS

(KEY 3)

INDICATOR COVER

(KEY 21)

INDICATOR WASHER

(KEY 20)

INDICATOR FITTING

(KEY 19)

STEM

(KEY 15)

O-RING

(KEY 18)

DIAPHRAGM

(KEY 9) AND

PLUG ASSEMBLY

(KEY 11)

O-RING

(KEY 8)

CAGE

(KEY 7)

INLET STRAINER

(KEY 23)

MAIN VALVE BODY

(E-BODY)(KEY 1)

Figure 6. Type LR128 Main Body Assembly Diagram

Disassembly

Disassembly of Type LR128

1. Shutdown, isolate and depressurize the main valve

and pilot according to the shutdown procedure.

2. Remove the cap screws (key 3). Lift up and

remove the bonnet (key 2) from the body (key 1).

CAUTION

Provide adequate support to the bonnet

when disassembling Type LR128

relief valve or backpressure regulator

installed in a vertical installation or

other application where the bonnet is

not oriented upward. Without adequate

support, the bonnet may fall and cause

physical injury when the cap screws

are loosened.

3. Remove the diaphragm (key 9) and plug (key 11)

assembly and bonnet O-ring (key 28).

4. Pull out the cage (key 7), O-ring (key 8) and

inlet strainer (key 23).

5. Clean parts and replace if necessary.

Assembly

1. Install the inlet strainer (key 23) into the body

(key 1).

Note

When installing in a vertical orientation,

apply lubricant to the bottom of the inlet

strainer (key 23) to help hold parts in

place while installing cage.

2. Lightly lubricate and install the cage O-ring (key 8).

3. Apply lubricant lightly to all O-rings or the mating

part before installing them.

4. Install the cage (key 7) and lightly lubricate and

install the bonnet O-ring (key 28).

5. Lubricate the top and bottom of the outer edge

(bead area) of the diaphragm (key 9) and place

diaphragm and plug (key 11) assembly on the

cage (key 7).

6. Lubricate the top plug O-ring (key 14).

7. If travel indicator was removed, lightly lubricate

the travel indicator assembly threads (key 19)

and screw it into the bonnet (key 2). See Travel

Indicator Assembly Maintenance for maintenance.

8. Install the bonnet (key 2) in proper orientation.

9. Lubricate cap screws (key 3) and secure the

bonnet (key 2), using an even crisscross pattern.

It may be necessary to push down on bonnet to

start cap screws. Tighten cap screws to proper

torque (see Table 9).

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 27 28

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Emerson LR128 Manual de Instruções Página 12

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