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

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care that the “T” slot in the Disc (48) engages the
head of the valve stem. The word ”TOP” should be
towards the actuator.
11. Replace the Set Screw (61) and the Pipe Plug (62).
12. Follow instructions under Installation & Start Up
Procedure when placing valve back in service.
Stem & Packing Replacement
1. Remove the Plate (47) and Disc (48), following the
procedure outlined under the Valve Seats section.
2. Loosen the Stem Connector Nut (18) and Bolt (17)
and remove Connector Halves (13).
3. Back out the Yoke SST Screws (12) and allow the
Body (46) to separate from the Yoke (10).
4. Remove the Packing Flange Nuts (9) and the Pack-
ing Flange (7).
5. When pulling the Stem (42) completely out of the
Body, you will remove most of the Packing Assem-
bly (2,5,6) also. The remaining parts of the Packing
Assembly can “fished” out with a small screwdriver.
(Be careful not to damage the packing bore.)
6. Clean the packing bore in the Body with solvent
and blow dry.
7. Clean the Stem (42) with solvent if it is to be reused.
8. Replace the Packing Spring (1) and Packing Retain-
er (2) in the packing bore.
9. Reassemble the new Packing (5) on the stem (42)
with the open part of the “V” downward (^). There
will be a flat on the top and bottom. Place the Pack-
ing Follower (6) on top of the Packing (5). (Coat
each piece of the packing set with a suitable lubri-
cant.)
10. Gently push the Packing (5) into the packing bore
and place the Packing Flange (7) on the stem.
11. Put the Packing Flange Nuts (9) on the Packing
Studs (8) and partially tighten. At this point it is rec-
ommended that you gently move the stem up and
down three or four times to align the assembly.
12. Tighten the Packing Flange nuts (9) until the Pack-
ing Follower (6) bottoms out on the top of the body.
13. Reassemble Yoke (10) to the valve Body (46) with
the four Yoke Screws (12). 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
actuator.
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 Upper Stem
Adapter (19) to the Valve Stem (42) using the Stem
Connector Halves (13), the Stem Connector Bolt (17),
Lockwasher (16), Nut (18), and Travel Pointer (14).
A. Actuator Disassembly
1. Remove the actuator assembly from the valve by
removing the four Adaptor Plate Bolts (27), and lift
the actuator assembly off the Yoke (10).
2. Place the actuator assembly on its top, (side with
the control line connection). Release the spring
compression, by threading the Actuator Stem (24)
out of the actuator, by turning it counterclockwise.
3. Remove the Actuator Bolts and Nuts (37) and sepa-
rate the two halves, (Upper Case [40] and Lower
Case [26]), of the actuator assembly. Remove the
six Range Springs (30) from the diaphragm plate.
4. Lift out the diaphragm assembly. Loosen and re-
move the two Actuator Jam Nuts (36) from the Ac-
tuator Bolt (34). Remove the Diaphragm Plate (29 &
31), Diaphragm (32), Diaphragm Stop (33), and the
Fastener Seal (35) from the Actuator Bolt (34) 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 (35), Diaphragm Stop (33),
Diaphragm (32), and Diaphragm Plate (29 & 31) on
the Actuator Bolt (34) in order. Align the Diaphragm
(32) and Diaphragm Plate (29) such that one of the
formed bosses on the Diaphragm Plate is lined-up
with one of the bolt holes in the Diaphragm. As-
semble and tighten the two locknuts (36) on the
actuator bolt (34), 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 (40), (half with the control
line connection) with the Diaphragm Plate (29) up.
Place the Range Springs (30) on the Diaphragm
Plate (29) so that they nest over the formed bosses.
Place the Lower Actuator Case (26), (half with the
Adaptor Plate (25)), so that the six bolts (28) 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 (37, 4)
at 90° increments and tighten finger-tight. Thread
the Actuator Stem (24), (with the Stem Adapter (19)
and Stem Locknut (20)) and Anti-Rotation
Device(23) onto the Actuator Bolt (34) until the
shoulder on the Actuator Stem (24) contacts the