Emerson LR128 Manual de Instruções descarregar pdf (Página 9)

Type LR128

W4559_1

RESTRICTOR ADJUSTMENT

Figure 5. Restrictor Adjustment and Restrictor Setting Guide

RESTRICTOR SETTING GUIDE

TYPE 112 RESTRICTOR ADJUSTMENT GUIDE

(1)

Regulator Performance 2 4 6 8

Accuracy

Hysteresis

Stability

Speed of Response (Main Valve Closing)

Speed of Response (Main Valve Opening)

Increased performance

Decreased performance

1. See Table 4 for recommended restriction settings.

Table 4. Recommended Setting for Type 112 Restrictor

BODY SIZE

RECOMMENDED RESTRICTION SETTING

In. DN

1 and 2 25 and 50 “6” (other restriction settings may be used)

3 80 “6” or “8” (lower settings are not recommended)

4 100 “8” (lower settings are not recommended)

The frequency of inspection and parts replacement

depends upon the severity of service conditions,

applicable codes and government regulations and

company inspection procedures. Table 8 lists possible

relief valve or backpressure regulator issues and

solutions for them.

Type LR128 Main Valve Trim

Parts Maintenance

Instructions are given for complete disassembly and

assembly. The main valve may remain in the pipeline

during maintenance procedures. Key numbers are

referenced in Figures 7 through 11.

WARNING

Avoid personal injury or damage

to property from sudden release of

pressure or uncontrolled process

uid. Before starting to disassemble,

carefully release all pressures

according to the Shutdown procedure.

Use gauges to monitor inlet, loading

and outlet pressures while releasing

these pressures.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 27 28

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