Emerson FISHER T208 Series Gebrauchsanweisung - Seite 6

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T208 Series

For external square head adjusting screw

1. Loosen the locknut (key 20).

2. Turn the adjusting screw (key 35) either clockwise

to increase outlet pressure or counterclockwise to

decrease outlet pressure. The regulator will go into

immediate operation. To ensure correct operation,

always use a pressure gauge to monitor the vapor

recovery pressure when making adjustments.

3. After making the adjustment, tighten the locknut

(key 20).

Shutdown

1. Close the nearest upstream shutoff valve.

2. Close the nearest downstream shutoff valve to

vent the regulator properly.

3. Open the vent valve on both the upstream and

downstream sides of the regulator. All pressure

between these shutoff valves is released through

the open vent valve. For a regulator with control

line, close the valve in the control line and vent

the diaphragm casing to the atmosphere.

Maintenance

Regulator parts are subject to normal wear and must be

inspected and replaced as necessary. The frequency

of inspection and replacement of parts depends upon

the severity of service conditions or the requirements

of local, state and federal regulations. Due to the

care Emerson takes in meeting all manufacturing

requirements (heat treating, dimensional tolerances,

etc.), use only replacement parts manufactured or

furnished by Emerson.

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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

first 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

Emerson 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 the

disk assembly, orifice and body seal O-ring. Release

all pressure from the regulator before performing

the following steps. Key numbers are referenced in

Figures 4, 5 and 6.

1. To inspect and replace the disk assembly (key 13),

remove the back body cap (key 43).

2. Remove the disk assembly (key 13) from the disk

spacer (key 44) and replace if necessary.

3. To inspect the orifice (key 5) on Types T208 and

T208M or throat seal O-ring (key 31) and machine

screw (key 34) on the Type T208M, remove the

cap screws (key 2) and separate the diaphragm

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

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

and the backup ring (key 49). Replace if damaged.

5. For a Type T208M, inspect the throat seal O-ring

(key 31) by removing the machine screw (key 34).

Replace if necessary. To install a throat seal, place

the throat seal O-ring on the machine screw and

thread into guide insert (key 18) to seal.

6. Inspect and replace the orifice (key 5) if necessary.

Lightly lubricate the threads of the replacement

orifice with a good quality lubricant and install with

340 to 470 in-lbs / 38.5 to 53.1 N•m of torque.

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

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

the body.