Emerson CSB400 Bedienerhandbuch PDF herunterladen (Seite 8)

CSB400 Series

Figure 4. Type CSB400DT Dual Registered Regulator Operational Schematic

Principle of Operation

Type CSB400 Base Regulator Operation

Refer to Figure 4. When downstream demand

decreases, the pressure under the regulator diaphragm

increases. This pressure overcomes the regulator

setting (which is set by the regulator control spring).

Through the action of the pusher post assembly, lever

and valve stem, the valve disk moves closer to the

orice and reduces gas ow. If demand downstream

increases, pressure under the regulator diaphragm

decreases. Spring force pushes the pusher post

assembly downward, the valve disk moves away from

the orice, and the gas ow increases downstream

as the regulator opens in response to the decreased

pressure underneath the regulator diaphragm.

Type numbers with a “T”, for example, Type CSB400IT,

provide a token or low-capacity relief. The Token relief

provides relief from minor overpressure caused by nicks

or dents on the orice or by thermal expansion of gas in

the downstream line. Token relief also provides a token or

signal, in the form of odor, that an overpressure situation

is occurring.

Additional overpressure protection options include

Types CSB403 and CSB423, which offer True-Monitor™

protection provided by an integral monitor module installed

on the inlet side of the valve body. This Integral True-Monitor

assumes control of the pressure to the downstream

system should the primary regulator fail to regulate. The

Types CSB404, CSB424 and CSB454 are examples of

CSB400 Series congurations that offer a slam-shut module

that shuts off the ow of gas to the downstream system in

the event of outlet pressure rising above or falling below the

predened levels due to a failure.

Optional token relief is available, which acts as a low-

capacity internal relief valve to relieve minor overpressure

situations due to nicks or other minor damage to the

orice or disk, or due to thermal expansion of the

downstream system.

Internal, external or dual outlet pressure registration is

available. Constructions with dual or external registration

require an external control line / sense line. For quick

changing loads, dual sense is recommended as it

provides the quickest response time.

TOKEN RELIEF SPRING

EXTERNAL CONTROL LINE

(SENSE LINE)

PUSHER POST

REGULATOR

CONTROL SPRING

LEVER

VALVE STEM

BALANCED PORT

ASSEMBLY

REGULATOR

ORIFICE

REGULATOR

DISK

REGULATOR

ADJUSTING SCREW

M1143

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

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

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