7
T205VB Series
4. Remove the cotter pin (key 15) if it is necessary
to replace the disk holder assembly (key 13). For
Type T205VBM, also 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 O-ring on the machine screw and thread into
guide insert (key 18) to seal.
Note
The disk holder assembly (key 13) is
comprised of the disk and disk holder.
5. Install the disk holder assembly (key 13) and
secure it to the valve stem (key 14) with the cotter
pin (key 15).
6. Install the backup ring (key 49) and body seal
O-ring (key 11) into the body (key 1).
7. Replace the diaphragm casing (key 4) on the body
(key 1) and secure with the cap screws (key 2)
using 90 to 126 in-lbs / 10.2 to 14.2 N•m of torque.
Diaphragm and Spring Case Area
Perform the following procedures to gain access to the
control spring, diaphragm assembly, valve stem and
stem O-ring. All pressure must be released from the
diaphragm case before performing the following steps.
Type T205VB
Key numbers are referenced in Figure 3.
1. Remove the closing cap (key 22) and turn the
adjusting nut (key 20) counterclockwise until all
compression is removed from the control spring
(key 6). If the only further maintenance is to
change the control spring, skip to step 11.
2. Remove the spring case cap screws (key 24)
and hex nuts (key 23) and lift off the spring case
assembly (key 3).
3. Remove the diaphragm (key 10) and attached
parts by tilting it 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 hex nut (key 21). If the only further
maintenance is to replace the diaphragm parts,
skip to step 8.
4. To replace the lever assembly (key 16), remove the
machine screws (key 17).
5. To replace the valve stem (key 14), also perform
Body Area maintenance procedure steps 1
through 4 and pull the valve stem out of the guide
insert (key 18).
6. Install the valve stem (key 14) into the guide insert
(key 18) and perform Body Area maintenance
procedure steps 5 through 7.
7. Install the lever assembly (key 16) into the valve
stem (key 14) and secure the lever assembly with
the machine screws (key 17) using 14 to 19 in-lbs /
1.6 to 2.1 N•m of torque.
8. Reassemble the diaphragm assembly in the
following order:
• Pusher post (key 8)
• Diaphragm head gasket (key 45)
• Lower diaphragm head (key 7)
• Diaphragm (key 10)
• Upper diaphragm head (key 7)
• Washer (key 36)
Secure with diaphragm hex nut (key 21) using
60 to 72 in-lbs / 6.8 to 8.1 N•m
of torque.
9. Install the pusher post (key 8) plus attached
diaphragm parts onto the lever assembly (key 16).
10. Install the spring case assembly (key 3) and
control spring (key 6) on the diaphragm casing
(key 4) so that the vent assembly is correctly
oriented and secure them with the spring case cap
screws (key 24) and hex nuts (key 23) to finger
tightness only.
11. Install the upper spring seat (key 19) and the
adjusting nut (key 20). Turn adjusting nut clockwise
until there is enough control spring (key 6) force to
provide proper slack to the diaphragm (key 10) and
attached parts. Using a crisscross pattern, finish
tightening the spring case cap screws (key 24) and
hex nuts (key 23) to 90 to 126 in-lbs / 10.2 to
14.2 N•m of torque. Finish turning the adjusting nut
to the desired outlet pressure setting according to
Adjustment procedure.
12. Install a replacement closing cap gasket (key 25)
if necessary, and then install the closing cap
(key 22).
