Emerson LR128 Manual de Instruções descarregar pdf (Página 7)

Type LR128

RELIEF PRESSURE CONTROL

BACKPRESSURE CONTROL

Figure 3. Typical Type LR128 Installation Schematic

A - VENT (TO DOWNSTREAM PIPING)

C - TO TYPE LR128 LOADING CHAMBER

D - PILOT SUPPLY (FROM UPSTREAM)

Startup and Shutdown

CAUTION

If pressure is introduced rst to the

main valve before the pilot, the main

valve may go wide-open and subject the

downstream system to full inlet pressure.

Note

The maximum inlet pressure for specic

constructions are given in Tables 1 and

2. Use a pressure gauge to monitor inlet

pressure during startup.

Relief Installation (Figure 3)

Startup

1. Close upstream vent valve (not shown).

2. Slowly open block valve and hand valve, if installed.

3. Adjust the pilot as needed.

Shutdown

1. Close block valve and hand valve, if installed.

2. Slowly open upstream vent valve (not shown).

Backpressure Installation (Figure 3)

Startup

1. Close upstream and downstream vent valves

(not shown).

2. Slowly open upstream block valve rst and then

slowly open downstream block valve.

3. Adjust the pilot as needed. If the pilot is not piped

downstream, make sure the pilot exhaust is

pointed in the correct direction.

Shutdown

1. Close upstream block valve rst and then close the

downstream block valve.

2. Open downstream and upstream vent valves

(not shown).

BLOCK VALVE STRAINER BLOCK VALVE

TYPE MR98H

TYPE LR128

MAIN VALVE

TYPE 112 RESTRICTOR

ALTERNATE PILOT

EXHAUST PIPING

NON-RESTRICTIVE

VENTS AND PIPING

ALTERNATE PILOT

EXHAUST PIPING

TYPE MR98H PILOT

TYPE LR128

MAIN VALVE

TYPE 112 RESTRICTOR

CONTROL LINE

ALTERNATE CONTROL LINE

STRAINER

HAND VALVE

STRAINER

BLOCK VALVE

MAIN PRESSURE LINE

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

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