Emerson T205 Instruction Manual download pdf (Page 7)

T205 Series

manufactured by Regulator Technologies

should be used for repairing Fisher

regulators. Restart gas utilization equipment

according to normal startup procedures.

General Maintenance

1. Visually inspect the regulator and its parts for

any damage.

2. Ensure tight connections, tight seals and safe operation.

If there is evidence of leakage or unstable internal

motion, a rebuild with seal replacement and relubrication

may be necessary.

3. Observe the blanketing pressure.

4. Inspect the inlet pressure for the proper pressure

(stamped on the regulator nameplate).

Body Area

Perform the following procedure to gain access to the

disk assembly, orice, body O-ring and pitot tube if used.

Release all pressure from the diaphragm casing and open

the disk assembly before performing the following steps.

Key numbers are referenced in Figures 7 and 8.

1. Remove the cap screws (key 2) and separate the

diaphragm casing (key 4) from the body (key 1).

2. Remove and inspect the body seal O-ring (key 11) and

the backup ring (key 49). See Figure 5.

3. Inspect and replace the orice (key 5) if necessary.

Protect the orice seating surface during disassembly

and assembly. Lubricate the threads of the replacement

orice with a good grade of light grease and install with

340 to 470 inch- pounds / 38.5 to 53.1 N•m of torque.

4. Remove the cotter pin (key 15) to replace the disk

assembly (key 13). If not necessary, skip to step 8.

5. To replace the pitot tube (key 32, Figure 7) on the

Type T205, remove the pitot tube machine screws

(key 17), install the new pitot tube and secure with the

pitot tube machine screws (key 17) using 14 to

19 inch-pounds / 1.6 to 2.1 N•m of torque. Position the

pitot tube so that it points into the outlet of the body by

rotating the guide insert (key 18).

6. To inspect the throat seal O-ring (key 31, Figure 8) on

the Type T205M, remove the machine screw (key 34,

Figure 8). Replace if necessary and reassemble.

7. Install the disk assembly (key 13) and secure it with the

cotter pin (key 15). Bend the cotter pin end using pliers

or equivalent tool (see Figure 6).

8. Place back-up ring (key 49) into the body (key 1). Then

place the body seal O-ring (key 11) into the body. See

Figure 5.

9. Place the diaphragm casing (key 4) on the body (key 1).

Secure the diaphragm casing to the body with the cap

screws (key 2) using 90 to 126 inch-pounds / 10.2 to

14.2 N•m of torque.

Diaphragm and Spring Case Area

Perform the following procedure to gain access to the

spring, diaphragm, lever assembly and stem. Release all

pressure from the diaphragm casing before performing the

following steps.

Note

Remove any remote control drive unit used

with a T205 Series regulator from the spring

case (key 3) before performing these steps.

1. For internal at circular adjusting screw – remove

the closing cap (key 22) and closing cap gasket

(key 25).

For external square head adjusting screw – loosen

the locknut (key 20).

2. Turn the adjusting screw (key 35) counterclockwise

to remove all the compression from the control spring

(key 6).

3. If the only maintenance procedure to be performed is

the changing of the control spring (key 6):

BODY MATERIAL END CONNECTION STYLE

(1)

PART NUMBER

3/4-inch / DN 20 Body 1-inch / DN 25 Body

Gray Cast iron NPT ERSA01588A0 ERSA01755A0

WCC Carbon steel

NPT ERSA00230A1 ERSA00194A1

CL150 RF ERSA01469A0 ERSA01469A1

CL300 RF ERSA01469A2 ERSA01469A3

PN 16/25/40 RF ERSA01469A4 ERSA01469A5

Stainless steel

NPT

(2)

ERSA00230A0 ERSA00194A0

CL150 RF ERSA01469A6 ERSA01469A7

CL300 RF ERSA01469A8 ERSA01469A9

PN 16/25/40 RF ERSA01469B0 ERSA01469B1

1. All anges are welded. Weld-on ange dimension is 14 inches / 356 mm face-to-face.

2. NACE Standard MR0175-2002.

Table 4. Body Materials and Part Numbers (Body, key 1)

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

T205 Series 1

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Emerson T205 Instruction Manual Page 7

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