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CSB400 Series

Maintenance and Inspection

WARNING

To avoid personal injury or equipment

damage, do not attempt any maintenance

or disassembly without rst isolating

the regulator from system pressure and

relieving all internal pressure as described

in “Shutdown”.

Regulators that have been disassembled

for repair must be tested for proper

operation before being returned to

service. Only parts manufactured by

Regulator Technologies should be used

for repairing Fisher

regulators. Restart

gas utilization equipment according to

normal startup procedures.

Due to normal wear or damage that

may occur from external sources, this

regulator should be inspected and

maintained periodically. The frequency

of inspection and replacement depends

on the severity of service conditions,

test results found during the annual

test, and on applicable codes and

regulations. In accordance with applicable

National or Industry codes, standards

and regulations/recommendations, all

hazards covered by specic tests after

nal assembly, before applying the CE

marking, shall also be covered after every

subsequent reassembly at installation site

in order to ensure that the equipment will

be safe throughout its intended life.

Periodic inspection must be performed

on the CSB400 Series that include the

Integral True-Monitor™ or slam-shut

overpressure protection modules to

ensure that they protect the downstream

system in the event the primary regulator

losses pressure control. This inspection

must test that the Integral True-Monitor or

slam-shut functions as intended.

Note

For adjusting setpoints above 100 mbar /

1.5 psig, use a 13 mm / 1/2-inch hex driver,

a 13 mm / 1/2-inch socket or a 27 mm /

1-1/16-inch socket to turn the adjusting

screw (key 65).

Disassembly to Replace the Regulator

Main Diaphragm

1. Remove the closing cap (key 60, Figure 11) or loosen

hex locknut (key 58, Figure 16). Turn the adjusting

screw (key 65) or nut (key 58) counterclockwise to

ease spring (key 38) compression.

2. Remove the adjusting screw (key 65) and spring

(key 38).

3. Remove hex nuts (key 16, Figure 11) and cap screws

(key 15, Figure 11). Separate the upper spring case

(key 1) from the lower casing assembly (key 9).

Note

When disassembling a CSB400 Series

regulator, lift the upper spring case (key 1)

straight up in order to avoid hitting the

stem (key 44).

4. Slide the diaphragm assembly (key 55) away

from the body (key 70) to unhook the pusher

post (key 51) from the lever (key 10). Lift off the

diaphragm assembly (key 55).

5. a. For none relieving units such as the

Types CSB400IN and CSB400EN, unscrew the

cap (key 45), see Figure 12, high-pressure Non-

Relief and low-pressure Non-Relief assemblies.

The cap fastens the R.V. spring seat (key 43)

to the pusher post (key 51). Unscrew the cap to

separate the R.V. spring seat (key 43), diaphragm

assembly (key 55) and pusher post (key 51).

b. For units with internal token relief such as

Type CSB400IT, refer to Figure 12, unscrew the

adjusting upper seat (key 47). This will allow for

removal of the relief spring (key 41), R.V. spring

seat (key 43), diaphragm assembly (key 55) and

pusher post (key 51).

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