Jordan Valve Mark 62 Series - Internally Piloted Regulator - Manual (Page 3)

-3-
To obtain the proper adjustment, remove the seats, 6.
(plate, disc, and disc-guide) from the valve and
loosen the locknut. Adjustment is obtained by ro-
tating the disc pin on the stem. To raise the disc,
rotate the stem so that it rises out of the disc pin
and vice versa.
When the preliminary adjustment has been made,
7.
tighten the locknut while holding the disc pin with
an open end wrench.
Now rotate the disc pin so that the seats may be
8.
repositioned in the valve.
Reinstall the seats as outlined in steps one through
9.
four.
If the orifices are not aligned properly, repeat steps
10.
six through ten until proper alignment is achieved.
(Note: The total stroke length of this valve is equal
to the orifice width plus 1/32” overlap. Conse-
quently perfect adjustment is required for proper
operation.)
Align the “>” on the cap with the “<” on the body,
11.
and place the cap over the two studs in the body.
Install the nuts and cap bolts. Tighten uniformly fol-
12.
lowing the Torque Pattern instructions of this I&M.
Reinstall the pilot tubing.
13.
Pilot Valve Maintenance
If the regulator should fail to operate properly, 1.
pipeline foreign matter may have clogged the pilot
valve mechanism.
Close the upstream and downstream shut-off
2.
valves.
Turn the adjusting screw counter-clockwise to re-
3.
lease spring compression, allowing pilot valve and
main valve to fully close.
Remove outlet pilot tube and then slowly open the
4.
upstream shut-off valve. If line fluid flows from the
tube connector into the bonnet, the pilot valve is
leaking. If line fluid flows from the tube connector
into the body, the main valve seats are leaking. Be
sure to close the upstream shut-off and bleed off
the pressure before proceeding with maintenance.
Loosen ring nut and remove spring case assembly,
5.
which includes hand-wheel, adjusting screw,
thumblock, spring case, and ring nut.
Remove the upper spring guide from the adjusting
6.
spring. Remove the spring, pilot diaphragm plate,
and pilot diaphragm.
Note that the pilot stem protrudes slightly above
7.
the pilot seat.
Remove the pilot assembly, using a ¾” socket
8.
wrench.
Use a small piece of steel wool and solvent on the
9.
Teflon pilot seat to remove pipe scale and foreign
matter. If, after cleaning, the Teflon pilot seat is
scarred, the pilot seat assembly must be replaced.
Install the pilot seat assembly carefully so that no
10.
burrs are raised on the hex. Burrs could puncture
the diaphragm.
At this time, IT IS IMPORTANT TO CHECK THE
11.
STROKE OF THE PILOT VALVE. Place a straight
edge across the pilot diaphragm seat. If the pilot
stem extends above the straight edge, the pilot
stem should be filed lightly so that it is flush with,
or slightly below, the straight edge. Excessive filing
of the pilot stem will cause short stroking and will
starve the supply pressure to the main valve dia-
phragm.
Reassemble in reserve order, making certain that
12.
the pilot diaphragm and pilot diaphragm plate is
positioned properly in the spring case.
Main Valve Stem, Disc Pin and
Lower Spring Replacement
Remove the strainer inlet pilot tube and outlet pilot 1.
tube. Follow the procedure outlined under Valve
Seats and remove the valve disc and plate.
Unscrew the bottom cap and remove the lower
2.
spring and lower spring guide.
Remove the bonnet screws and lift the bonnet as-
3.
sembly from the main valve body.
The main diaphragm can now be removed and re-
4.
placed if necessary.
To remove the disc pin, unscrew the stem locknut
5.
and the disc pin from the valve stem. The stem can
now be removed upward through the body flange.
The disc pin can now be removed through the
6.
valve body bore by lifting up and out.
Clean all parts of the valve body and cap with sol-
7.
vent, and replace any part which appears to be
worn or defective.
Reassemble in reverse order. Insert the stem
8.
through the body flange and the disc pin into the
body bore.
Thread the stem locknut and the disc pin all the
9.
way on the valve stem and back off one-half turn.
Place the main diaphragm plate on the valve stem,
10.
making certain that the valve stem is positioned
properly in the hole of the main diaphragm plate.
Replace the main diaphragm, making sure that it is
11.
installed properly in the recess of the valve body.
Place the valve bonnet assembly on the valve body
12.
and tighten the cap screws uniformly and diago-
nally.
Insert the return spring guide (14) and the return
13.
spring in the bottom cap making certain that the
spring guide engages the disc pin properly.
A stroke adjustment will probably be required.
14.
Please note the procedure outlined under VALVE
SEATS.
Replace the strainer, inlet pilot tube, and outlet pi-
15.
lot tube.
Valve is now ready for installation and start up.
16.