Jordan Valve Mark 687 Series - Piloted Regulator with Class VI Shutoff - Manual (Page 2)

Main Valve
Note: All work to the main valve can be accomplished
in-line. The only reason to remove the valve is if
the location makes it too difficult to work on the
regulator.
Main Valve Diaphragm
1. Remove pilot valve tubing.
2. Remove the control line to the upper case.
3. ]Remove the actuator bolts (24) and nuts (25) from
the upper and lower actuator cases. Important -
leave two opposing bolts assembled.
4. Use caution when removing the final two bolts. The
upper case is spring-loaded by the internal return
spring (22).
5. Remove the return springs from the diaphragm plate
(20).
6. Remove the valve stem bolt (15) and seal washer
(27) from the diaphragm assembly.
7. Remove the diaphragm stop (12) from the center of
the diaphragm plate.
8. Lift off the diaphragm plate and remove the dia-
phragm (21).
9. Inspect and replace as required by reversing the
above steps.
10. When re-assembling, it is necessary to balance the
lower support plate (13) on top of the valve plug/
stem assembly (4). Make sure the valve stem bolt
engages all parts in the diaphragm assembly before
tightening. Use a new seal washer (27).
11. To tighten the valve stem bolt, hold the outside of
the diaphragm plate to prevent the assembly from
turning while tightening the bolt.
Pilot Valve Seats
1. Carefully loosen the bottom cap (15) from the pilot
body.
2. The return spring (16) and plug (17) will come out
with the bottom cap.
3. The strainer screen (not shown) should be pulled out
of the body cavity and cleaned.
4. Unscrew the pilot seat assembly (13) from the pilot
body.
5. Replace the pilot seat assembly as a unit and re-install
all parts in reverse order.
6. Minimum torque on the pilot seat is 200 in-lbs and
50 ft-lbs on the bottom cap.
7. The use of a liquid Teflon paste or similar assembly
fluid is recommended for both the pilot seat and bot-
tom cap.
-2-
12. Make sure to locate the return springs on the
stamped guides in the diaphragm plate before as-
sembling the upper case.
Main Valve Seats
1. Remove diaphragm as listed above.
2. Remove the actuator nut (11) from the lower case.
3. Lift the lower case assembly off of the bonnet.
4. Remove the 4 body bolts (not shown).
5. Lift off the bonnet assembly (1) from the main valve
plug / stem assembly (4).
6. Remove the plug / stem (4), spacer (28), and case
from the body bore. Note - the cage will normally
come out with the plug.
7. Remove the seat assembly and o-ring (7) from the
bore of the body.
8. Separate the plug / stem from the cage.
9. Remove plug -O-ring (18).
10. Clean all parts with a light solvent.
11. Replace o-ring numbers (7), (8), (18), & (19).
12. Use a light grease, such as Dow Corning #4 to lubri-
cate all o-rings prior to re-assembly.
13. Place the seat o-ring (7) into the body bore, pushing
it all the way into the corners of the bore.
14. Place the seat ring (5) on top of the o-ring.
15. Insert a new Teflon seat (6) into the groove on the
seat ring.
16. Assemble the plug o-ring (18) to the plug groove.
Place an additional amount of grease on the outside
of the o-ring and carefully insert the plug / stem into
the cage being careful not to damage the o-ring.
17. Place the cage and plug / stem on top of the seat
assembly in the body.
18. Place a new spacer (28) on top of the cage.
19. Insert the bonnet (2) over the stem and onto the
body.
20. Assemble the 4 body bolts using an even cross-
torquing method. Torque to 75 ft-lbs.
21. Place the packing spring (26), retainer (29), new set
of packing (10), and the packing follower (9) into the
packing bore of the bonnet. Lubricate each piece of
packing upon installation.
22. Place the lower actuator assembly over the bonnet.
Make certain the port on the lower case is oriented
to the same side as when it was removed, and is 90°
to the flow direction.
23. Secure the actuator nut (11) to the lower case using
a minimum of 100 ft-lbs or torque.
24. Follow the steps outlined above under “Main Valve
Diaphragm” to finish assembling the actuator.