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Type T205B

gauge to monitor the tank blanketing gas pressure

when making adjustments.

3. After making the adjustment, tighten the locknut

(key 20).

Shutdown

1. Close the nearest upstream shutoff valve and then

close the nearest downstream shutoff valve to vent

the pressure in the regulator properly.

2. Close the valve in the control line and vent the

pressure in the lower casing.

3. Open the vent valve between the regulator and

the downstream shutoff valve nearest to it. All

pressure between these shutoff valves is released

through the open vent valve, since a Type T205B

remains open in response to the decreasing

downstream pressure.

Maintenance

Due to normal wear or damage that may occur

from external sources, inspect and maintain the

regulator 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

assembling 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.

WARNING

To avoid personal injury, property damage

or equipment damage caused by sudden

release of pressure or explosion of

accumulated gas, do not attempt any

maintenance or disassembly without

rst isolating the regulator from system

pressure and relieving all internal pressure

from the regulator.

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.

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 an 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

orice and body O-ring. Release all pressure from the

diaphragm casing and open the disk assembly before

performing the following steps. Key numbers are

referenced in Figure 6.

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).

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

(key 1). Then place the body seal O-ring

(key 11) into the body.

5. 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, stem and disk

assembly. Release all pressure from the diaphragm

casing before performing the following steps.

Key numbers are referenced in Figure 6.

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).

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

Type T205B 1

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