Emerson FISHER T208 Series Manuale di istruzioni - Pagina 7
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In the following steps, be sure to install
the spring case barrel pointed down as
shown in Figure 1.
8. 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 in-lbs / 10.2 to 14.2 N•m of torque.
9. Secure the disk assembly (key 13) to the disk
spacer (key 44). Place the back disk spring
(key 41) and a new back body seal O-ring (key 42)
on the back body cap (key 43).
10. Lightly lubricate the threads when replacing the
body cap assembly. Use 340 to 470 in-lbs /
38.5 to 53.1 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. Key numbers are
referenced in Figures 4, 5 and 6.
To Change the Control Spring
For internal flat circular adjusting screw
1. Remove the closing cap (key 22) and closing cap
gasket (key 25). Turn the adjusting screw (key 35)
counterclockwise to remove all the compression from
the control spring (key 6).
2. Remove the adjusting screw (key 35) and
change the control spring (key 6) to match the
desired spring range.
3. Install the adjusting screw (key 35).
4. Adjust the outlet pressure to the desired control
pressure setting, refer to steps 2 and 3 of
Adjustment section.
5. Change the stamped spring range on the spring
case nameplate.
For external square head adjusting screw
1. Loosen the locknut (key 20) and turn the adjusting
screw (key 35) counterclockwise to remove all the
compression from the control spring (key 6).
2. Remove the adjusting screw (key 35), locknut
(key 20), closing cap (key 22), closing cap gasket
(key 25) and upper spring seat (key 19).
Note
3. Take out the control spring (key 6) and replace
with the desired spring.
4. Reinstall the upper spring seat (key 19), closing
cap gasket (key 25), closing cap (key 22), locknut
(key 20) and adjusting screw (key 35).
5. Adjust the outlet pressure to the desired control
pressure setting, refer to steps 2 and 3 of
Adjustment section.
6. Change the stamped spring range on
the nameplate.
To Disassemble and Reassemble
Diaphragm Parts
Use this procedure to gain access to the control spring,
diaphragm assembly, valve stem and stem O-ring. All
pressure must be released from the diaphragm case
assembly before performing these steps. Key numbers
are referenced in Figures 4, 5 and 6.
1. For internal flat circular adjusting screw -
remove the closing cap (key 22), closing cap
gasket (key 25) and adjusting screw (key 35).
For external square head adjusting screw -
remove the adjusting screw (key 35), locknut
(key 20), closing cap (key 22), closing cap gasket
(key 25) and upper spring seat (key 19).
2. Remove the hex nuts (key 23) and cap screws
(key 24). Lift off the spring case (key 3) and
remove the control spring (key 6).
3. Remove the diaphragm (key 10) plus attached
parts by tilting them so that the pusher post
(key 8) slips off the lever assembly (key 16).
To separate the diaphragm assembly from the
attached parts, unscrew the cap screw (key 38)
from the pusher post. If the only maintenance
is to replace the diaphragm components, skip to
step 7.
4. To replace the lever assembly (key 16), remove
the machine screws (key 17). To replace the stem
(key 14) or stem seal O-ring (key 30), also perform
Body Area Maintenance procedure steps 1
through 3 and pull the stem (key 14) out of the
guide insert (key 18).
5. Install the stem (key 14) into the guide insert
(key 18) and perform Body Area Maintenance
procedure steps 7 through 10 as necessary.
6. Install the lever assembly (key 16) into the stem
(key 14) and secure the lever assembly with the
machine screws (key 17).
T208 Series
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