Emerson CP200 Instruction Manual download pdf (Page 8)

CP200 Series

Maintenance

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.

Regulator Reassembly

It is recommended that a good quality pipe thread sealant

be applied to pressure connections and ttings and a good

quality lubricant be applied to all O-rings except when

replacing key 19, as key 19 is a friction t O-ring for holding

the stem guide into the lower casing. Also apply an anti-

seize compound to the adjusting screw threads and other

areas as needed.

Annual Maintenance on Types CP205 and

CP206 Secondary Seat™ Protection

The Type CP205 regulator does not have any means to alert

when the Secondary Seat operates at lockup. Therefore it

is recommended that an annual lock-up test be done on the

regulator to determine if the lock-up pressure is higher than

normal. If so, the regulator primary disk and orice should

be replaced.

Types CP205IT and CP206 have internal token relief.

Internal relief operation on these units is an indication

that the Secondary Seat Protection on the Type CP205IT

may not be working and that the Type CP206 Secondary

Seat may have closed. Maintenance should address any

potential causes for internal relief operation as well as other

regulator malfunctions separate from the Secondary Seat.

To Replace Main Diaphragm

1. Disconnect the tubing connectors (key 29, Figure 5)

from the loading pressure regulator.

2. Remove closing cap (key 60) 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. Unthread the cap screw (key 15) from the nuts (key 16)

and remove. Lift the spring case (key 1) with attached

pilot off the lower casing (key 9) and the closing 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. Ensure that the diaphragm assembly is

assembled so that when the diaphragm bolt holes are

aligned with the lower casing (key 9) bolt holes that the

lever (key 10) can be easily inserted into the slot of the

pusher post (key 50, Figures 5 and 6). This ensures

that no rubbing occurs between the lever and diaphragm

assembly during its upward and downward travel. The

arch or bow of the diaphragm should be toward the

lower casing (key 9, Figure 5). Ensure the diaphragm

does not fold over at the ange when tightening the

ange screws.

To Replace Valve Disk and Orice

1. Remove the tubing connectors (key 29, Figure 5) from

the regulator body (key 70).

2. Remove the two bolt (key 71) which hold the union ring

(key 17) portion of the lower casing to the body.

3. The regulator can be removed from the body, exposing

the disk (key 36) and the orice (key 25).

4. Examine the seating surface of the disk. If it is nicked,

cut, or otherwise damaged, the disk should be removed

from the valve stem (key 11) and replaced.

5. a. If the seating edge of the Type CP200 orice (key 25,

Figure 7) is nicked or rough, remove the orice from

the body using a 7/8-inch / 22 mm socket wrench.

b. If equipped with a Type CP205/206 Secondary Seat

orice assembly, inspect the primary seating surface

as well as the secondary seating surface and sealing

surface. If nicks or other damage are present,

remove the orice assembly from the body using a

7/8-inch / 22 mm socket wrench.

Apply anti-seize lubricant to the external threads of

the new orice and reassemble.

6. Reassemble in reverse order of the above procedure.

Ensure that the lever has not become detached from

the pusher post. Care should be taken so that the

O-ring (key 21) is not cut.

Types 67CP and 67CPR

Trim Maintenance

Key Numbers are referenced in Figure 8.

1. Remove four ange screws (key 3) from the bottom plate

(key 39) and separate the bottom plate and O-ring (key 4)

from the body (key 1).

1 2 3 4 5 6 7 8 9 10 11 12

CP200 Series 1

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Emerson CP200 Instruction Manual Page 8

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