Emerson CSB400 Instrukcja Obsługi Pobierz pdf (Strona 10)

CSB400 Series

Figure 7. CSB400 Series Regulator Installed with the Vent Pointed Downward and with a

Type 289H Relief Valve for High Capacity Relief

Type CSB403 Integral

True-Monitor™ Operation

Type CSB403 combines the operation of a conventional

two-regulator wide-open monitor set into one body, see

Figure 5. The Integral True-Monitor is installed on the

inlet side of the body and serves to throttle ow and

maintain an acceptable downstream pressure in the

case where the primary regulator ceases to regulate

downstream pressure. During normal operation the

Integral True-Monitor is in a wide-open state as its

setpoint is set higher than the primary regulator. See

Table 7 for guidance regarding the setpoints of the

regulator and associated Integral True-Monitor sets.

If the downstream pressure should rise to the setpoint of

the Internal Monitor due to a loss of pressure control by

the primary regulator, the Integral True-Monitor

will assume control and regulate the ow to the

downstream system. If token relief is present, it will

relieve a small amount of gas to the atmosphere as an

indication that the Integral True-Monitor is controlling the

downstream pressure.

The Type CSB403 provides the option of internal or

external downstream pressure registration. External

registration requires a downstream sensing line. See

Figure 9 for guidance regarding installation of the

downstream control line. Refer to the Type TM600

Instruction Manual for additional details of Integral

True-Monitor operation.

Type CSB404 Slam-shut Operation

The Type VSX4 slam-shut module on the Type CSB404

regulator is a fast acting shut-off device that provides

overpressure (OPSO) or over and underpressure

(OPSO / UPSO) protection by completely shutting off the

ow of gas to the downstream system. See Table 8 for

guidance regarding the typical setpoints of the regulator

and associated slam-shut OPSO and also the combined

OPSO and UPSO setpoints. The Type VSX4’s actions

are independent of the Type CSB404 regulator and of

variations to the inlet pressure. The Type VSX4 comes

standard with external downstream pressure registration,

with the option for internal registration only on the Rp 1

x 2-1/4 GAZ body. External registration requires a

downstream sensing line. See Figure 10 for guidance

regarding installation of the downstream control line.

The Type VSX4 shut-off disk is normally in the open

(reset) position, see Figure 6. If the downstream

pressure below the slam-shut diaphragm increases (or

decreases) until it reaches the slam-shut setpoint, this

diaphragm moves upward (or downward) to release

the trip mechanism which allows the spring force on

the stem to push the disk against the seat, shutting off

all gas ow. To reset the slam shut after gas has been

shut off, refer to the Type VSX4 Instruction Manual for

additional details.

CSB400 SERIES

REGULATOR

REGULATOR VENT

POINTED DOWNWARD

PROTECT VENT PIPE

WITH RAIN CAP

NPS 2 TYPE 289H

RELIEF VALVE

GE27692

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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