Jordan Valve Mark 52 Series – Internally Piloted Regulator - Manual (Page 3)

-3-
rotating the disc pin (16) on the valve stem (17). To
raise the valve disc, rotate the disc pin so that it
rises on the valve stem.
When this preliminary adjustment is obtained, lock
6.
the valve stem locknut while holding the disc pin
with an open end wrench.
Now rotate the disc pin so that the valve plate and
7.
disc can be positioned in the valve body.
Insert the valve plate and disc in the body bore, us-
8.
ing the same precautions as outlined above.
The seats will be in the closed position. To check
9.
the adjustment, again blow air into the inlet pilot
connection to open the valve. Check the alignment
of the orifices.
If orifices do not line up properly, further adjust-
10.
ment will be required.
Replace the plate and disc into the body bore, fol-
11.
lowed by the disc guide (10).
Note that the disc guide (10) has one polished sur-
12.
face. In replacing the disc guide, make certain that
the polished surface faces the valve plate (9). The
index pin aligns the disc guide to the plate to make
sure the slots in the disc align with the slots in the
plate. Line the index pin up with the < on the valve
body.
In replacing the valve cap (7), note that the scribe
13.
marking >< on the valve cap and the valve body
must be in alignment. Use care to make certain
that the disc guides and the index pin are properly
aligned with the valve disc and the index pin hole
in the valve plate, respectively. Normally a slight ro-
tation of the valve cap is sufficient to obtain proper
alignment.
Replace the cap screws and tighten uniformly, be-
14.
ing careful not to torque excessively. See page 4
for torque requirements.
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 clockwise to fully com-
3.
press the spring, closing the pilot valve and main
valve.
Remove the outlet pilot tube (19) and then slowly
4.
open the upstream shut-off valve. If line fluid flows
from the tube connector in the bonnet, the pilot
valve is leaking. If line fluid flows from the tube con-
nector on the body, the main valve seats are leak-
ing. Be sure to close the upstream shut-off valve
and bleed off the pressure before proceeding with
maintenance.
Loosen ring nut (1) and remove spring case assem-
5.
bly which includes handwheel (29), adjusting screw
(28), thumblock (30), spring housing (31) and ring
nut (1).
Remove the upper spring guide (26) from the
6.
adjusting spring (32). Remove the spring (32), pilot
diaphragm plate (33) and pilot diaphragm (25).
Remove the pilot seat assembly with a socket
7.
wrench.
Clean the pilot seat assembly with a solvent and
8.
compressed air. If the pilot seat is scarred, the pilot
assembly should be replaced as a unit.
Install the pilot seat assembly carefully so that no
9.
burrs are raised on the hex.
Reassemble in reverse order, making certain that
10.
the pilot diaphragm (25) and pilot diaphragm plate
(33) are positioned properly in the spring housing
(31).
Main Valve Stem, Disc Pin and Lower
Spring Replacement
Remove the strainer inlet pilot tube (5) and outlet 1.
pilot tube (19). Follow the procedure outlined under
Valve Seats and remove the valve disc and plate.
Unscrew the bottom cap (12) and remove the lower
2.
return spring (13) and lower spring guide (14).
Remove the bonnet screws (20) and lift the bonnet
3.
assembly from the main valve body.
The main diaphragm (4) can now be removed and
4.
replaced if necessary.
To remove the disc pin (16), unscrew the stem
5.
locknut (18) and the disc pin from the valve stem
(17). The stem can now be removed upward
through the body flange.
The disc can now be removed through the valve
6.
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 through the locknut and into the
9.
disc pin approximately 1/4”.
Place the valve main diaphragm plate (6) on the
10.
valve stem making certain that the valve stem in
positioned properly in the hole of the main dia-
phragm 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 cap screws uniformly and diagonally.
Insert the return spring guide (14) and the return
13.
spring (13) in the bottom cap (12) 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
15.