Emerson CP400 Instruction Manual download pdf (Page 13)

CP400 Series

Step 4:

• Once the operator feels the click of the re-latch

occurring, the reset button (key 30) should be

pushed completely back into its original position.

Shutdown

Installation arrangements may vary, but in any

installation it is important that the valves be opened or

closed slowly and that the outlet pressure be vented

before venting inlet pressure to prevent damage caused

by reverse pressurization of the regulator. The steps

below apply to the typical installation as indicated.

1. Open valves downstream of the regulator.

2. Slowly close the upstream block valve.

3. Pressure releases downstream.

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 of parts

depends upon the severity of service

conditions or the requirements of local,

state and federal rules and regulations.

Periodic inspection must be performed

on the CP400 Series that include

the Integral 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 Monitor or

slam-shut functions as intended. The

frequency of this inspection must be at

intervals not exceeding 15 months, but at

least once each calendar year.

When maintenance is required on the

slam-shut device, refer to the Type VSX4

Instruction Manual, part number

D103127X012. When maintenance is

required on the Integral True-Monitor™

device, refer to the Type TM600

Integral Monitor Instruction Manual, part

number D103126X012.

To Replace Main Diaphragm

1. Disconnect the tubing connector (key 29, Figure 8)

from the loading pressure regulator.

2. Remove closing cap (key 60, Figure 8) and

unscrew the nut (key 47). Unthread the upper

spring seat (key 42) using a at head screwdriver.

Remove the closing spring (key 38).

3. Unscrew and remove the cap screws (key 15) and

nuts (key 16) and lift the spring case (key 1) with

attached loading regulator off the lower casing

(key 9) and the closing stem (key 44).

Note

When disassembling a CP400 Series

regulator, lift the upper spring case

(key 1) and the loading pressure

regulator straight up in order to avoid

hitting the stem (key 44).

4. Lift the diaphragm assembly (key 55) slightly so

that the pusher post (key 51) can release the valve

lever (key 10).

5. Hold the pusher post (key 51) xed while

unscrewing the closing stem (key 44) from the

pusher post (key 51). Remove the diaphragm

retainer (key 43) and diaphragm head (key 55).

The diaphragm can now be removed.

6. Reassemble in the reverse order of the above

procedure. Before tightening the cap screws (key 15)

or closing stem (key 44) into the pusher post (key 51),

place the loosely-assembled diaphragm assembly

(key 55) into position in the lower casing (key 9), the

arch or bow of the diaphragm should be towards the

diaphragm head and lower casing (see Figure 8).

Ensure that the pusher post (key 51) is hooked on

the lever (key 10). Rotate the diaphragm (key 55) so

that the diaphragm and lower casing (key 9) holes

are aligned.

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CP400 Series 1

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Emerson CP400 Instruction Manual Page 13

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