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

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valve body while holding the disc and plate assem-
bly in place; then slowly let the assembly drop out of
the body into your hand.
It is imperative that the Disc Pin assembly is not
rotated when disassembling, cleaning or reassem-
bling because it will affect the stroke adjustment of
the valve.
Using a fine emery cloth, clean the plate seat in 6.
the body (49). Clean the body and cap cores with a
good quality solvent.
To clean the disc (4) and plate (3), remove the guide
7.
screws (5). Place 4/0 polishing cloth or jeweler’s
cloth on a smooth, flat surface and polish the lapped
surfaces of the disc and plate by rubbing them
on the cloth in a circular motion. If the parts are
scarred, do not attempt to re-lap them. Return them
to the factory for repair or replacement. Clean the
pressure ring (8) in the same manner.
B. Reassembly
Place the disc (4) on the plate (3) and replace the 1.
guide screws (5). Do not allow the guide screws to
bind.
Replace the disc and plate assembly in the valve
2.
body so that the disc pin engages the disc and the
plate is seated firmly in the valve body.
The orifice alignment should be checked only when
the actuator stem assembly is in the position (up or
down) that will hold the valve fully open. Direct Act-
ing - up and open. Reverse Acting - down and open.
Check the disc and plate orifice alignment. The ori- 3.
fices must be fully open and in perfect alignment.
If the orifices are not in perfect alignment, proceed
4.
to Valve Stroke Adjustment below. If the alignment is
perfect, proceed with steps 5 and 6.
Once the orifices in the plate and disc are properly
5.
aligned, place a straight edge across the body bolt
holes on the horizontal center line of the valve (per-
pendicular to the valve movement). Gently rotate the
disc and plate assembly until the edges of the orifice
slots are parallel to the straight edge.
Remove the straight edge and replace the pressure
6.
ring, and the cap being careful not to rotate the seat
assembly. Replace the cap bolts and tighten in the
sequence and to the torque specified on the last
page.
Disc Pin
Remove the pressure ring (8) and the disc and plate 1.
assembly (4,3) as outlined in the preceding section
“Valve Seats”.
Remove the stem connector nut (19) and bolt (18). 2.
Remove the two halves of the stem connector (17).
Back out the four Allen headscrews (50) which will
3.
allow the yoke (20) to be lifted off the body (49).
Loosen the disc pin nut (7) and rotate the disc pin
4.
(6) counter-clockwise while putting the stem (16)
upward. DO NOT completely remove the stem,
but raise it only enough to allow the disc pin to be
removed.
Replace the disc pin and reassemble in reverse or-
5.
der following procedures in “Valve Seats” and “Valve
Stroke Adjustment”.
Packing
To replace the packing, the valve need not be removed
from the line; however, PRESSURE MUST BE REMOVED
FROM THE VALVE.
Loosen and remove the stem connector nut (19) and 1.
bolt (18), and remove the two halves of the stem
connector (17).
Remove both packing flange nuts (15), the packing
2.
flange (12), and the packing follower (11).
The packing spring (9) should eject the packing (10);
3.
if not, a slight amount of downstream pressure might
be necessary to remove the packing.
Remove the packing retainer (13) and the packing
4.
spring (9).
Clean the packing bore in the body and the stem
5.
thoroughly with solvent and blow out solvent.
Reassemble new packing in reverse order. Packing
6.
nuts must be tightened until the packing follower
flange bottoms out on the top of the valve body.
Engage the valve stem (16) and actuator stem (22)
7.
in the stem connector (17). Replace stem connect
to bolt and nut and tighten. No stroke adjustment is
required.
Valve Stroke Adjustment
If, after one of the preceding maintenance procedures,
the valve requires a stroke adjustment:
Remove the pressure ring (8) and the disc and plate 1.
assembly (4, 3) as outlined in the section “Valve
Seats”.
Loosen the disc pin locknut (7) and replace the disc
2.
and plate assembly.
Loosen the stem connector nut (19) only enough to
3.
allow the stem (16) to rotate. DO NOT remove the
stem connector (17) as proper positioning of the
valve stem and actuator stem must be maintained.
Direct Acting:
4. Make sure that the stem is stroked
fully upward by the spring so that the seats are fully
open. Cool the bulb if necessary, being careful not
to cool to more than 30°F less than the lower limit of
the control range.