Jordan Valve Mark 508 Series – Tank Blanketing Valve - Manual (Page 2)

washer (31) on top of the valve stem (23).
18. Proceed to step 9 in the section on replacing main
diaphragm.
Troubleshooting
If you experience erratic control:
 Oversizing causes cycling and hunting, and reduc-
es the rangeability of the valve. Make certain that
your sizing is correct.
 Excessive foreign matter may be on seats; clean
seats.
 Valve stem may not be moving freely; inspect and
clean.
 Moving parts may be binding; inspect and realign
or replace if necessary.
If valve will not operate:
 Diaphragm may be ruptured and require replace-
ment.
 Adjusting spring may be broken and require re-
placement.
 Spring may be set improperly and require resetting.
Ordering Spare Parts
Jordan Valves are ruggedly built, carefully assembled to
accurate dimensions, and individually tested for perfor-
mance. A complete stock of finished parts is maintained
for immediate delivery. In order to supply you with the
precise parts designed for your specific valve, please
supply the following: valve serial number (found on
nameplate), body material, valve model number, end
connections (if flanged, supply flange rating), body size,
spring range or set point.
5. Remove the actuator flange bolts (8) and nuts (9).
6. Remove the upper case (5).
7. Lift the diaphragm assembly as far up as possible
and place a wrench on the valve stem (23).
8. Remove the spring guide (4), diaphragm plate (6),
main diaphragm (7). Discard the main diaphragm.
9. Using new replacement parts, reverse the above
procedure to reassemble. Lubricate o-rings prior
to installation with a suitable lubricant such as Dow
Corning #4 grease.
Plug and Seat Replacement
1. Perform all steps in the section on replacing main
diaphragm.
2. Remove the seat washer (30) and the thread seal
washer (31).
3. Remove the ring nut (11), the lower case (10), and
the bonnet seal o-ring (12) and the stem bushing
(13). It is recommended that the stem bushing and
bonnet seal o-ring be replaced when performing
this maintenance.
4. Remove the bolts (26) and lockwashers (27) that
secure the bonnet (14) to the body (16).
5. Remove the bonnet (14), and the body/bonnet o-
ring (24). It is recommended that the body/bonnet
seal o-ring be replaced when performing this main-
tenance.
6. Grasp the valve stem (23) and remove the stem/
plug assembly.
7. Use seat removal tool (Jordan Part Number 15533-
110) to remove the seat (22).
8. Remove the seat o-ring (21). Jordan recommends
that this o-ring be discarded and replaced with a
new one when this maintenance is performed.
9. Lubricate the new seat o-ring (21) prior to installa-
tion with a suitable lubricant such as Dow Corning
#4 grease. Install the o-ring (21) over the threads
and on the seat (22).
10. Carefully thread it into the body (16).
11. Use the seat removal tool to tighten the seat. Do
not over tighten! Compressing the seat o-ring into
the body bore is all that is required to produce a
seal.
12. Place the new stem/plug assembly into the seat
(22).
13. Lubricate the new body/bonnet o-ring (24) and
place it into the body (16).
14. Place the bonnet (14) over the stem and onto the
body (16). Bolt the bonnet in place using the four
cap screws (26) and lockwashers (27).
15. Install the new stem bushing (13). Lubricate and
install the bonnet seal o-ring (12) into the bonnet
(14).
16. Place the lower case (10) over the bonnet (14).
Install ring nut (11) on bonnet threads and tighten
securely.
17. Place the seal washer (30) and the thread seal
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