Jordan Valve Mark 75HW Series – Wafer Style Hand Operated Valves - Manual (Page 2)

scarred, do not attempt to re-lap them, but return
them to the factory for repair or replacement.
B. Reassembly
1. Place the plate (2) on a clean, flat work surface with
the lapped side up. The small single locator hole
should be towards you.
2. If the valve action is “reverse”, place the Disc (8)
on the Plate with the words “TOP REVERSE” away
from you. If the valve action is “direct”, the words
“TOP DIRECT” should be away from you. Move the
Disc (8) until the slots are in perfect alignment with
those of the plate (2).
3. Place the Guides (11) on either side of the Disc (8),
and secure them with the Guide screws (12) so that
the Disc (8) can move freely up and down but not
side to side.
4. Lightly lubricate both side of the Body Gasket (13)
with an anti-seize compound. Place a new Body
Gasket (13) into the Body (1).
5. Hold the Plate / Disc assembly together and insert
it into the large end of the Body (1) with the slots
perpendicular to the stem (3), taking care that the
“T” slot in the Disc (8) engages the head of the
valve stem. The word ”TOP” should be towards the
actuator.
6. Replace the Set screws (17) in the Body (1).
7. Follow instructions under Installation & Start Up
Procedure when placing valve back in service.
Stem & Packing Replacement
1. Remove the Plate (2) and Disc (8), following the
procedure outlined under the Valve Seats section.
2. Loosen the Stem Connector Nut (4) and Bolt and
remove Connector Halves.
3. Back out the Yoke SST Screws (9) and allow the
Body (1) to separate from the Yoke (18).
4. Remove the Packing Flange Nuts (19) and the Pack-
ing Flange (7).
5. Before pulling the Stem (3) completely out of the
Body, you must remove the Stem T-Head (10) by
unscrewing it from the Stem (3). Remove the Pack-
ing Assembly (14, 15, & 16). 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 (3) with solvent if it is to be reused.
8. Replace the Packing Spring (14) and Packing Re-
tainer (15) in the packing bore.
9. Reassemble the new Packing (16) on the stem (3)
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 (16). (Coat
each piece of the packing set with a suitable lubricant.)
the inlet valve until you are sure that the controller
and valve have control of the system. Usually, the
handwheel on the inlet valve will turn freely when
this point is reached.
4. To shut off the line fluid, close the inlet shutoff
valve first, and then close the outlet shutoff valve.
5. Loosen the body set screws (42).
6. It may be necessary to re-torque the pipe flange
bolts.
Maintenance
Caution: Make certain that there is no pressure in the
valve before loosening any fittings or joints. The fol-
lowing steps are recommended:
1. Close the inlet shutoff valve.
2. Allow pressure to bleed off through the down-
stream piping. Do not attempt to reverse the flow
through the valve by bleeding pressure from the
upstream side of the valve.
3. When the pressure gauges indicate that all pres-
sure has been removed from the system, close the
outlet shutoff valve and the valve may be serviced.
Note: refer to the drawing at the end of this document
for description and proper orientation of parts.
Valve Seats
A. Disassembly
The sliding Gate Seats of Jordan Valves are lapped to
light band flatness. Maintaining such tolerances is of
paramount importance for your assurance of excellent
control and tight shutoff. DO NOT use metallic objects
in removing the seats. Care in handling is imperative.
1. Tighten the body set screws (17). Follow instruc-
tions under the Maintenance section to remove
valve from line.
2. Disassemble the valve only as far as necessary to
do the required work.
3. When replacing seats it is recommended by Jordan
Valve that the packing be replaced if the valve is
older than one year. Follow the instructions under
Packing Replacement.
4. Remove the Set screws (17), and remove the Plate
(2), Disc (8), and Gasket (13). Place the plate on the
bench with the lapped surface up.
5. Clean all parts of the Body (1) with a good quality
solvent. Remove Guide screws (12) and Guides
(11), the Disc (8) and Plate (2) can then be cleaned.
Place a piece of 4/0 polishing cloth or jeweler’s
cloth on a smooth flat surface such as a surface
plate and polish the Disc, and Plate lapped sur-
faces using a figure “8” motion. If the parts are
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