Emerson LR128 Manual de Instruções descarregar pdf (Página 11)

Type LR128

Table 8. Troubleshooting Guide

ISSUE POSSIBLE SOLUTION (SEE FIGURES 7 AND 14 FOR PARTS LOCATION)

Unit does not provide tight shutoff when

inlet pressure is below set pressure

Check for:

• damage or improper installation of the main valve O-rings

• erosion or trapped debris on the cage and diaphragm surfaces

• damage or debris on the surfaces of the pilot plug and seat

• mineral deposits or sediment buildup inside the spaces of the restrictor and/or pilot supply strainer/lter

• debris clogging the gaps inside the restrictor

Main valve is wide-open when inlet

pressure is below set pressure

Check for:

• debris in the restrictor, pilot or pilot supply strainer/lter

• debris in the main valve

• main valve and pilot diaphragms for damage

Liquid escapes from pilot spring case • Replace pilot diaphragm assembly

Liquid escapes from travel indicator • Replace indicator stem O-ring, if indicator is not desired, convert to a non-travel indicator assembly

Unit does not open when inlet pressure

is above set pressure

Check for:

• clogged main valve inlet strainer (if used) or pilot supply strainer/lter (if used)

• main valve diaphragm damage

• proper control line connection and make sure control line hand valve (if used) is open

Inlet pressure rises higher than expected

Check for:

• correct main valve sizing

• clogged main valve inlet strainer

• restrictive inlet or outlet piping

• plugged or restricted control line

• proper control line location (should not be installed in or directly downstream of an elbow or swage)

• proper springs in the main valve and pilot

Unit response gets slower and performance

starts to decrease

Check for:

• mineral deposits or sediment buildup inside the spaces of the restrictor

• debris clogging the gaps inside the restrictor

• clogged pilot supply lter/strainer

BODY SIZE

DIAPHRAGM

MATERIAL

MAXIMUM

OPERATING

INLET

PRESSURE

(3)

MAXIMUM

OPERATING

DIFFERENTIAL

PRESSURE

(3)

MAXIMUM

EMERGENCY INLET

AND DIFFERENTIAL

PRESSURE

DIAPHRAGM

STYLE

In. DN psig bar psid bar d psid bar d

1 25

17E68 Nitrile (NBR), Low temperature 450 31.0 400 27.6 450 31.0

130

17E97 Nitrile (NBR), High-pressure

and/or erosion resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

17E88 Fluorocarbon (FKM), High aromatic

hydrocarbon content resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

2 50

17E68 Nitrile (NBR), Low temperature 450 31.0 400 27.6 450 31.0

17E97 Nitrile (NBR), High-pressure

and/or erosion resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

17E88 Fluorocarbon (FKM), High aromatic

hydrocarbon content resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

3 80

17E68 Nitrile (NBR), Low temperature 360 24.8 300 20.7 450 31.0

17E97 Nitrile (NBR), High-pressure

and/or erosion resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

17E88 Fluorocarbon (FKM), High aromatic

hydrocarbon content resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

4 100

17E68 Nitrile (NBR), Low temperature 360 24.8 300 20.7 450 31.0

17E97 Nitrile (NBR), High-pressure

and/or erosion resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

17E88 Fluorocarbon (FKM), High aromatic

hydrocarbon content resistance

450 31.0 450

(2)

31.0

(2)

450 31.0

1. See Table 1 for main valve structural design ratings and Table 3 for pilot ratings.

2. For differential pressure above 400 psid / 27.6 bar d diaphragm temperatures are limited to 150°F / 66°C.

3. These are recommendations that provide the best regulator performance for a typical application. Please contact your local Sales Ofce for further information if a deviation from the

standard recommendations are required.

Table 7. Type LR128 Maximum Pressure Ratings and Diaphragm Selection Information

(1)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 27 28

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