Emerson CS800 Manual de Instruções descarregar pdf (Página 3)

CS800 Series

increases, pressure under the 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 diaphragm.

The Type CS800IR regulator includes an internal relief valve

for overpressure protection. If the downstream pressure

exceeds the regulator setting by 7 in. w.c. to 2.5 psig / 17 to

172 mbar (depending on the type number and main spring

used), the relief valve opens and excess gas is vented

through the stabilizer vent in the upper spring case. Units

with standard internal relief valve have 1 NPT vent size,

Figure 2, while units with high-capacity relief valve have

2-1/2 NPT vent size, Figure 3.

The Types CS800IT, CS800IL, CS800ET and CS800EL

provide a low-capacity/token relief. 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.

Types CS803 and CS823 Integral

True-Monitor Operation

Types CS803 and CS823 combine the operation of a

conventional two-regulator wide-open monitor set into one

body, see Figure 4. The Integral True-Monitor is installed on

the inlet side of the body and serves to control downstream

pressure in the situation where the Primary regulator can no

longer regulate downstream pressure.

Table 1. Available Congurations

TYPE NUMBER

OPTIONS

C S 8

OUTLET PRESSURE CONSTRUCTION

0 Low Pressure Applications (Outlet Pressure: 3.5 to 30 in. w.c. / 9 to 75 mbar)

2 Medium Pressure Applications (Outlet Pressure: 1 to 5.5 psig / 0.07 to 0.38 bar)

5 High Pressure Applications (Outlet Pressure: 5 to 10 psig / 0.34 to 0.69 bar)

(1)

OVERPRESSURE PROTECTION MODULE

0 Without Overpressure Protection Module

3 With Integral True-Monitor Module

(4)

4 With Slam-shut Module

(4)

5 With Secondary Seat Protection

6 With Secondary Seat Protection with controlled bleed to indicate Secondary Seat is functioning

(2)

PRESSURE REGISTRATION

I Internal Registration

E External Registration

(3)

RELIEF

N Non-Relieving

R Internal Relief

Q High-Capacity Relief

T Token Relief

L Low Flow Token Relief

Example: Type Number CS800IR: Type CS800 regulator without Overpressure Protection Module with Internal Pressure

Registration and with Internal Relief.

1. High-pressure Construction is not available with True Monitor Protection, Secondary Seat Protection or Relief.

2. Available only with Internal Relief or High-Capacity Relief Constructions.

3. Available only with Non-Relieving or Token Relief Constructions.

4. Reference Instruction Manual D103126X012 for information regarding the Type TM600 Integral True-Monitor or Instruction

Manual D103127X012 for Type VSX8 safety slam-shut module.

High Capacity Relief - Provides an increase in relief

performance over basic internal relief via a 2-1/2 NPT vent

thereby offering a signicant improvement in the level of

overpressure protection to the downstream system in the

event of an overpressure occurrence.

Integral True-Monitor™ Protection - Provides a monitoring

regulator integrally mounted on the inlet side of the valve

body that assumes control of ow to the downstream system

should the primary regulator cease to regulate ow.

Secondary Seat™ Protection - Provides a solution to

the most common cause of regulators failing to shutoff by

employing a secondary seating surface to provide shutoff

in the event the primary orice seating surface becomes

damaged or blocked.

Slam-Shut Protection - Discontinues gas service

by shutting the gas off if there is an overpressure or

underpressure condition.

Principle of Operation

Types CS800, CS820 and CS850 Base

Regulators Operation

Refer to Figures 2 and 3. When downstream demand

decreases, the pressure under the 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

1 2 3 4 5 6 7 8 ... 31 32

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