Jordan Valve Mark 75 Series – Wafer Style Control Valve - Manual (Page 2)

solvent. Remove Shoulder Screws (43) and Wave
Springs (51), the Disc (48) and Plate (47) 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
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 or replacement.
B. 6” Reassembly
1. Locate the markings “TOP REV” and “TOP DIR” on
the back of the plate (47). If the valve action is “air
to open”, place the Plate on a clean, flat work sur-
face with the words “TOP REV” away from you and
the lapped side up and words down. If the valve
action is “air to close”, place the Plate on a clean,
flat work surface with the words “TOP DIR” away
from you and the lapped side up.
2. If the valve action is “air to open”, place the Disc
(48) on the Plate with the words “TOP REVERSE”
away from you. If the valve action is “air to close”,
the words “TOP DIRECT” should be away from you.
Move the Disc (48) until the slots are in perfect
alignment with those of the plate (47).
3. Place the Wave Springs (51) on the Shoulder
Screws (43). Insert them through the vertical slots
in the Disc (48), and tighten until a mechanical
stop is felt. DO NOT OVERTIGHTEN. The Disc (48)
should move freely up and down, but not side to
side.
4. Hold the Plate / Disc Assembly (47 & 48) together
and insert it into the large end of the Body (46) with
the slots perpendicular to the stem (42), taking care
that the “T” slot in the Disc (48) engages the head
of the valve stem. The word “TOP REV” should be
towards the actuator for air to open. The word “TOP
DIR” should be towards the actuator for air to close.
5. Replace the Set Screws (61).
6. Follow instructions under Installation & Start Up
Procedure when placing valve back in service.
B. 8” Reassembly
7. Place the plate (47) on a clean, flat work surface
with the lapped side up. The small single locator
hole should be towards you.
8. If the valve action is “air to open”, place the Disc
(48) on the Plate with the words “TOP REVERSE”
away from you. If the valve action is “air to close”,
the words “TOP DIRECT” should be away from you.
Move the Disc (48) until the slots are in perfect
alignment with those of the plate (47).
9. Place the Wave Springs (51) on to the Shoulder
Screws (43). Insert them though the vertical slots in
the Disc (48), and tighten until a mechanical stop is
felt. DO NOT OVERTIGHTEN. The Disc (48) should
move freely up and down, but not side to side.
10. Hold the Plate / Disc assembly (47 & 48) together
and insert it into the large end of the Body (46)
with the slots perpendicular to the stem (42), taking
2. The control valve has been pre-set by Jordan Valve,
however, finer adjustment may be required to com-
pensate for the system conditions of your application.
3. With inlet, outlet and bypass shutoff valves closed,
and no pressure in the downstream line, gradually
open the inlet valve enough to start flow through
the control valve. Increase the flow gradually by
slowly opening the inlet shutoff valve. Do not fully
open the inlet valve until you are sure that the
controller and control 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. Remove the pipe plug (62) and loosen the set
screw(61). Replace the pipe plug (62).
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. Remove the pipe plug (62) (8” only), and tighten
the set screw (61). Keep the pipe plug in a secure
place. Follow instructions 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 (61), and remove the Plate
(47) and Disc (48). Place the plate on the bench
with the lapped surface up.
5. Clean all parts of the Body (46) with a good quality -2-