Jordan Valve Mark 50 Series – Self-Operated Back Pressure Regulator - Manual (Page 2)

Diaphragm Replacement
1. In removing the diaphragm, you must first remove the
valve disc and valve plate. This is outlined under SEAT
REMOVAL.
2. Remove the compression of the adjusting spring by ro-
tating the adjusting screw counterclockwise.
3. Remove the upper spring housing. Remove adjusting
spring, spring seat and ball bearing.
4. Hold the disc pin with an open end wrench and remove
the diaphragm assembly by rotating counterclockwise.
The diaphragm assembly consists of the upper dia-
phragm plate, diaphragm, and lower diaphragm plate.
5. If the diaphragm must be replaced, secure the lower
diaphragm plate in the vise. Use a wrench on the hex of
the upper diaphragm plate and turn counterclockwise to
remove.
6. Remove the diaphragm and replace in reverse order.
Tighten. For elastomer diaphragms, clean (degrease)
threads and apply one drop of Loctite #290. Thread the
parts together and tighten 1/8 - 1/4 turn.
7. Continue on to the procedures outlined under STROKE
ADJUSTMENT.
Packing Replacement
1. Remove the valve from line.
2. Back off the adjusting screw.
3. Remove the upper spring housing, spring, spring seat
and ball bearing.
4. Unscrew the diaphragm assembly.
5. Remove the screws, packing flange and packing follower.
6. Remove the packing. The packing may have a tendency
to stick in the packing cavity if the valve has been in ser-
vice for some time. Movement of the stem may help.
7. The packing retainer and packing spring may be re-
moved, if necessary.
8. Be certain that all packing material has been removed.
Check the stem for scratches, etc. Replace if necessary. If
the stem must be replaced, remove the seats as outlined
under SEAT REMOVAL, and DISC PIN.
9. Replace the packing. Refer to the drawing for proper ori-
entation of the packing.
10. Insert the packing follower.
11. Place the packing flange over the packing follower and
insert the screws.
12. Pull the screws down, one turn each, alternating from
one to the other until the packing follower is snug against
the body and the packing flange is parallel to the body
surface.
13. Proceed to the procedures outlined under STROKE AD-
JUSTMENT.
Disc Pin Replacement
1. Remove the valve disc and the valve plate, following the
procedure outlined under SEAT REMOVAL.
2. Remove the diaphragm as outlined under DIAPHRAGM
REPLACEMENT.
3. Holding the disc pin assembly with an open end wrench,
loosen the stem locknut. The stem can now be un-
screwed from the disc pin and removed.
4. Remove the disc pin and locknut.
Trouble Shooting
If You Experience Erratic Control:

Oversizing causes cycling and hunting and reduces the
rangeability of the valve. Make certain that your sizing is
correct.

Steam traps downstream may need attention.

Safety valve may be jammed open.

Excessive foreign matter on Seats.

Valve stroke out of adjustment. Check and readjust if
necessary.

Valve disc may not be moving freely. Check disc guide
clearance and clearance of the stem to the bushings.
If the Valve Will not Operate:

Diaphragm ruptured.

Adjusting spring broken. Replace.

Improper spring setting. Reset.
Maintenance
WARNING: Be sure that there is no pressure in the valve
before loosening any fittings or joints. The following steps
are recommended.
1. Close inlet shut-off valve, and by-pass valve.
2. Back off adjusting screw to allow inlet pressure to open
seats.
3. Allow pressure to bleed off through downstream piping.
4. When inlet pressure gauge indicates no pressure in the
line, close the outlet shut-off valve.
5. Close the control line shut-off valve.
Refer to the drawings for the proper orientation of the parts
and for proper nomenclature.
Seat Removal
CAUTION: The seats of Jordan regulators are preci-
sion-lapped. Maintaining such tolerances is of para-
mount importance for your assurance of excellent
control and tight shutoff. Do not use metallic objects
in removing the seats, and care in handling is impera-
tive.
1. With the valve out of the line, remove the bolts securing
the valve cap to the valve body and lift the cap straight
up.
2. Lift the disc from the plate and place on a clean surface
with the seating side up.
3. Place the valve body on a side. Hold one hand over the
plate to receive it and tap lightly on the back of the plate
with a soft, blunt object; push the plate out evenly. Place
the plate on a clean surface seating side up.
4. Clean out all parts and the body and cap with a good
quality solvent. The valve disc and plate may then be
cleaned. Place 4/0 polishing cloth or jeweler’s cloth on
a smooth, flat surface and polish the lapped surfaces. If
the parts are scarred, do not attempt to re-lap them, but
return them to the factory for repair or replacement.
5. Continue on to the procedures outlined under STROKE
ADJUSTMENT.
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