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CSB400 Series

For Type CSB423 with external control lines, use tubing

with an outer diameter of 13 mm / 0.5 inch or larger for

both the primary regulator and Integral True-Monitor™.

Downstream Control Line Installation

with Slam shut

Refer to Figure 10. When installing the Types CS404ET,

CS404EN, CSB424ET, CSB424EN and CSB454EN

regulators, connect downstream control line tubing to

the lower casing of the regulator and run the tubing

downstream of the regulator outlet with a minimum

distance of 4 times the outlet pipe diameter. Connect

a second, separate downstream control line tubing to

the lower casing of the slam shut and run the tubing

downstream of the regulator outlet a minimum distance

of 4 times the outlet pipe diameter.

For Type CSB404 with external control lines, use tubing

with an outer diameter of 9.5 mm / 0.375 inch or larger

for the primary regulator and 6.4 mm / 0.25 inch or larger

for the slam shut.

For Types CSB424 and CSB454 with external control lines,

use tubing with an outer diameter of 13 mm / 0.5 inch or

larger for the primary regulator and 6.4 mm / 0.25 inch or

larger for the slam shut.

Installation with External

Overpressure Protection

If the regulator is used in conjunction with a Type 289H

relief valve, it should be installed as shown in Figure 7.

The outside end of the vent line should be protected

with a rainproof assembly. The Type 289H is typically set

25 mbar / 10 inches w.c. higher than the outlet pressure

setting of the regulator, up to 75 mbar / 30 inches w.c.

outlet pressure. For pressure greater than this, set the

Type 289H 0.05 bar / 0.75 psi higher than the outlet

pressure setting of the regulator.

Vent Line Installation

The CSB400 Series regulators have a 1 NPT screened

vent opening in the spring case. If necessary to vent

escaping gas away from the regulator, install a remote

vent line in the spring case tapping. Vent piping should

be as short and direct as possible with a minimum

number of bends and elbows. The remote vent line

should have the largest practical diameter. Vent piping

on regulators with token relief must be large enough

to vent all relief valve discharge to atmosphere without

excessive backpressure and resulting excessive

pressure in the regulator.

For types with optional Token relief, this low capacity

relief is located in the spring case of the primary

regulator. If necessary to vent escaping gas away, install

a remote vent line in the spring case tapping of the

primary regulator as described above. Periodically check

all vent openings to be sure that they are not plugged

or obstructed.

CSB400 Series outlet pressure ranges are shown in

Table 6. Outlet pressure higher than 0.34 bar / 5 psig

above the setpoint may damage internal parts such as

the diaphragm head and valve disk. The maximum

emergency (casing) outlet pressure is 4.0 bar / 58 psig.

Commissioning

CAUTION

Pressure gauges must always be used to

monitor downstream pressure during Startup.

With the downstream system depressurized, use the

following procedure to start up the regulator.

1. Check to see that all appliances are turned off.

2. Slowly open the upstream shut-off valve.

3. Check inlet and outlet pressure for correct values.

4. Check all connections for leaks.

5. Turn on utilization equipment and recheck

the pressures.

Adjustment

Note

For types that include the Integral

True-Monitor module, refer to the

Instruction Manual for Type TM600

Integral True-Monitor for adjustment and

maintenance of the Integral True-Monitor.

For the types that include the slam-shut

module, refer to the Instruction Manual for

Type VSX4 slam shut for adjustment and

maintenance of the slam shut.

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