Jordan Valve Mark 80 Series – Self Operated Temperature Regulator - Manual (Page 3)

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close the outlet shutoff valve, and the valve may be
serviced.
Note: refer to the drawing at the end of this docu-
ment for description and proper orientation of parts.
Valve Seats
A. DISASSEMBLY
The valve seats in all Jordan regulators are lapped
to a light band flatness. Maintaining such toler-
ances is of paramount importance for your assur-
ance of excellent control and tight shut-off. Do
not use metallic objects in removing the seats.
Care in handling is imperative.
Close the shutoff valve on each side of the valve, 1.
and remove valve from line.
Note scribed “<” on the side of the valve body (1) 2.
and cap (2). Secure the body outlet flat in a vise.
Remove the cap screws and two nuts, and lift the
cap straight up.
Before removing, check the disc (5) for a stamped 3.
arrow. This arrow points to the “<” on the body.
Remove the disc guide and the disc. Place the
valve disc on the bench with lapped surface facing
up. Protect the lapped surfaced on both sides of
the disc guide.
IMPROPER HANDLING OF SEATS WILL RESULT IN
LEAKAGE OR POOR CONTROL.
It is imperative that the disc pin not be rotated when
disassembling, cleaning, or reassembling, since this
affects the stroke adjustment.
Lightly tap on the body to remove the plate (4). 4.
Invert the body, let valve plate drop out into your
hand, and place it on the bench with lapped sur-
face facing up.
Clean all the parts, body, and cap with solvent. 5.
Place a piece of 4/0 polishing cloth or jewelers
cloth on a smooth, flat surface such as a surface
plate, and polish the disc, plate, and disc guide
lapped seating surfaces using a “figure 8” motion.
If the parts are scarred, do not attempt to re-lap
them, but return them to the factory for repair and
replacement. If the seats are not scarred deeply,
they can be repaired at nominal cost.
The vertical sections of the disc guide serve as 6.
guides for the disc while stroking. A 0.005” feeler
gauge should be used to check for clearance be-
tween this surface and the side of the disc. If the
clearance is less, clean the guide surfaces in the
disc guide with a fine file.
B. REASSEMBLY
Place the plate in the body, lapped surface facing 1.
the cap. The index pin hole should be on the same
side as the “<” on the body. Align the disc pin so
that it is centered in the body bore and protrudes
though the center slot in the valve plate (unless
you are changing the valve action - See Section on
Changing Valve Action.)
Place the disc on the plate, engaging the index pin. 2.
If there is an arrow on the disc, it should point to-
ward the index pin hole on the plate.
Place the disc guide onto the plate, engaging the 3.
disc pin. Rotate the assembly slightly until the slot
openings in the disc are parallel to the opening in
the plate, and perpendicular to the stem. Stroking
the valve will aid in this alignment.
Align the “>” on the cap with the “<” on the body, 4.
and place the cap over the two studs in the body.
Install the nuts and cap screws. Tighten uniformly. 5.
See back page for torque requirements and tight-
ening procedures.
Stem, Disc Pin & Packing Replacement
Remove disc and plate following the procedure 1.
outlined under Valve Seats.
Loosen stem connector nut and bolt and remove 2.
connector.
Back out the four allen head yoke screws (1/2” - 2” 3.
sizes) which will allow the body to be separated
from the yoke.
Remove the packing flange nuts and the packing 4.
flange.
Loosen the stem locknut and rotate the disc pin 5.
counterclockwise, pulling the valve stem upward
while doing so.
When pulling the stem completely out of the body 6.
you will remove most of the packing assembly also.
The remaining parts of the packing assembly can
“fished” out with a small screw driver.
Clean the packing bore in the body with solvent 7.
and blow dry.
The disc-pin may be removed through the body 8.
bore.
Clean the stem and disc-pin with solvent if they are 9.
to be reused.
Reassemble the disc-pin, stem and locknut in the 10.
valve body as they originally were.
Replace the packing spring and packing retainer in 11.
the packing bore.
Reassemble the new packing on the stem with the 12.
open part of the “V” downward (^). There will be a
flat on the top and bottom. Place the packing fol-
lower on top of the packing.
Gently push the packing into the packing bore and 13.
place the packing flange on the stem and over the
packing studs.
Put on the flange nuts and tighten them partially. At 14.
this point it is recommended that you gently move
the stem up and down three or four times to align
the assembly.
Tighten the flange nuts until the packing follower 15.
bottoms out on the top of the body.
Replace actuator in reverse order. Reassemble the 16.