Jordan Valve Mark 75 Series – Wafer Style Control Valve - Manual (Page 3)

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7. Clean the Stem (20) with solvent if it is to be reused.
8. Replace the Packing Spring (37) and Packing Re-
tainer (38) in the packing bore.
9. Reassemble the new Packing (40) on the stem (20)
with the open part of the “V” downward (^). There
will be a flat on the top and bottom. Place the Pack-
ing Follower (23) on top of the Packing (40). (Coat
each piece of the packing set with a suitable lubri-
cant.)
10. Gently push the Packing (40) into the packing bore
and place the Packing Flange (24) on the stem.
11. Put the Packing Flange Nuts (43) on the Packing
Studs (25) and partially tighten. At this point it is
recommended that you gently move the stem up
and down three or four times to align the assembly.
12. Tighten the Packing Flange nuts (43) until the Pack-
ing Follower (23) bottoms out on the top of the
body.
13. Reassemble Yoke (3) to the valve Body (1) with the
four Yoke Screws (29). Reassemble the Seats by
inserting in the body as outlined in Valve Assembly
Section.
Actuator
CAUTION: DO NOT apply more than 45 psi to the ac-
tuator.
The valve need not be removed from the line; however
before performing any maintenance on the actuator:

Since there will be no control of the valve available
it is recommended that the valve be isolated from
the service.
 Shut off the control air supply and remove the con-
trol line from the actuator.
 Remove the stem connector assembly (Stem
Adapter (22) to the Valve Stem (20) using the Stem
 Connector Halves (21), the Stem Connector Bolt
(30) and Nut (31).
A. Actuator Disassembly
1. Remove the actuator assembly from the valve by
removing the four yoke Bolts (26), and lift the ac-
tuator assembly off the Yoke (3).
2. Place the actuator assembly on its top, (side with
the control line connection). Release the spring
compression, by threading the Actuator Stem (14)
out of the actuator, by turning it counterclockwise.
3. Remove the Actuator Bolts and Nuts (6,7) and
separate the two halves, (Upper Case [5] and Lower
Case [4]), of the actuator assembly. Remove the six
Range Springs (10) from the diaphragm plate (11).
4. Lift out the diaphragm assembly. Loosen and re-
move the two Actuator Jam Nuts (17) from the Ac-
tuator Bolt (16). Remove the Diaphragm Plate (11),
Diaphragm (15), Diaphragm Stop (13), and the Fas-
tener Seal (18) from the Actuator Bolt (16) also.
5. Clean all parts with a good quality solvent. Remove
any encrusted material with crocus or very fine alu-
minum oxide cloth. Inspect all parts for excessive
wear and/or damage. Replace any worn or dam-
aged parts. USE ONLY JORDAN REPLACEMENT
PARTS. The use of other than genuine JORDAN
parts may result in damage to the actuator, per-
sonal injury or property damage.
B. Actuator Reassembly
1. Place the Fastener Seal (18), Diaphragm Stop (13),
Diaphragm (15), and Diaphragm Plate (11) on the
Actuator Bolt (16) in order. Align the Diaphragm
(15) and Diaphragm Plate (11) such that one of the
formed bosses on the Diaphragm Plate is lined-up
with one of the boltholes in the Diaphragm. As-
semble and tighten the two locknuts (17) on the
actuator bolt (16), taking care that they are locked
together, and that the alignment between the dia-
phragm and the plate is maintained.
2. Place the Diaphragm Assembly (from step 1) on
the Upper Actuator Case (5), (half with the control
line connection) with the Diaphragm Plate (11) up.
Place the six Range Springs (10) on the Diaphragm
Plate (11) so that they nest over the formed bosses.
Place the Lower Actuator Case (4), (half with the
Adaptor Plate (19)), so that the six bolts (12) nest in
the Range Springs. The Range Springs must also
remain nested over the bosses in the diaphragm
plate.
3. Replace four of the Actuator Bolts and Nuts (6,7) at
90° increments and tighten finger-tight. Thread the
Actuator Stem (14), (with the Stem Adapter (22) and
Stem Locknut (33)) onto the Actuator Bolt (16) until
the shoulder on the Actuator Stem (14) contacts
the Adapter Plate (19). Some spring compression
should be felt.
4. Replace the remaining Actuator Bolts and Nuts and
tighten evenly across the actuator case.
5. Reassemble the Actuator Assembly to the Yoke
(3) and adaptor plate (19) making sure that the
recessed area faces the actuator, using the four
stroke plate bolts (26).
6. Reconnect the Adaptor Stem (22) to the Valve Stem
(20) using the Stem Connector Halves (21), the
Stem Connector Bolt (30) and Nut (31).
7. Adjust the spring pre-load following the instruc-
tions in the Spring Adjustment section of this I&M.
Valve Stroke Adjustment
1. Loosen the Stem Connector Nut (31) only enough
to allow the Stem Adapter (22) to rotate. DO
NOT REMOVE the Stem Connector (21). Proper
positioning of the Valve Stem (20) and the Stem
Adaptor (22) must be maintained while adjusting
the seats.