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2. Remove the adjusting screw (key 35) and change
the control spring (key 6) to match the desired
spring range.
3. Replace the adjusting screw (key 35).
4. Install a replacement closing cap gasket (key 25), if
necessary, and reinstall the closing cap (key 22).
5. If the spring range was changed, be sure to
change the stamped spring range on the spring
case nameplate.
To Disassemble and Reassemble
Diaphragm Parts:
This procedure is for gaining access to the control
spring, diaphragm, valve stem and stem O-ring. All
pressure must be released from the diaphragm casing
before these steps can be performed.
1. Remove the closing cap (key 22) and the adjusting
screw (key 35).
2. Remove the hex nuts (key 23, not shown) and cap
screws (key 24), lift off the spring case assembly
(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 from the attached parts, unscrew the
diaphragm plate cap screw (key 38) from the pusher
post. If the only further maintenance is to replace the
diaphragm parts, skip to step 7.
4. To replace the lever assembly (key 16), remove
the machine screws (key 17). To replace the
stem (key 14), perform Body Area Maintenance
procedure steps 1 and 3, and pull the stem 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 6 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).
7. Install the lower head gasket (key 45), Lower Spring
Seat (key 50), diaphragm (key 10), diaphragm head
(key 7) and washer (key 36) on the pusher post
(key 8), and secure with cap screw (key 38) using
30 to 45 ft-lbs / 3 to 5 N•m of torque.
8. Install the pusher post (key 8) plus attached
diaphragm parts onto the lever assembly (key 16).
9. Install the spring case (key 3) on the diaphragm
casing (key 4) so the vent assembly (key 26)
is properly oriented, and secure it with the cap
screws (key 24) and hex nuts (key 23, not shown)
fingertight only.
10. Install the control spring (key 6) and the adjusting
screw (key 35) in the spring case (key 3). Turn the
adjusting screw clockwise until there is enough
control spring force to provide proper slack to the
diaphragm (key 10). Using a crisscross pattern,
finish tightening the cap screws (key 24) and hex
nuts (key 23, not shown) to 18 to 21 ft-lbs /
24 to 28 N•m of torque. To adjust the outlet pressure
to the desired setting, refer to the Startup and
Adjustment section.
11. Install a replacement closing cap gasket (key 25) if
necessary, and then install the closing cap (key 22).
12. Install the Type T208PL on the Type 1290 with the
Type T208PL spring case barrel pointed down.
For a Type T208PL
This procedure is for gaining access to the control
spring, diaphragm assembly and valve stem. All
pressure must be released from the diaphragm case
assembly before these steps can be performed. Key
numbers are referenced in Figure 9.
1. Remove the closing cap (key 22) and slowly turn the
adjusting nut (key 20) counterclockwise removing all
compression from the control spring (key 6). Remove
the adjusting nut and the upper spring seat (key 19). If
the only further maintenance is to change the control
spring, skip to step 11.
2. Remove the hex nuts (key 23, not shown) and cap
screws (key 24), lift off the spring case assembly
(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 casing (key 4) from the attached parts,
unscrew the diaphragm head hex nut (key 21) from
the pusher post. If the only further maintenance is to
replace the diaphragm parts or change the control
spring (key 6), skip to step 7.
4. To replace the lever assembly (key 16), remove
the machine screws (key 17). To replace the
stem (key 14) perform Body Area Maintenance
procedure steps 1 and 4, and pull the stem out of
the diaphragm casing (key 4).
5. Install the stem (key 14) into the diaphragm casing
(key 4) and perform Body Area Maintenance
procedure steps 6 through 10 as necessary.
Type 1290
9
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