Jordan Valve Mark 67 Series – Piloted Sliding Gate Regulator - Manual (Page 3)

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come out.
2. Unscrew the seat (13). Lapping is recommended
for replacement pilot seats.
3. Assemble the valve in reverse order.
Main Valve
It is necessary to remove the main valve from the line
only if the main valve seats must be replaced, inspected
or adjusted. All other operations can be performed with
the valve in the line and without disturbing the stroke
adjustment.
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 our assurance of excellent
control and tight shutoff. DO NOT use metallic objects
in removing the seats. Care in handling is imperative.
1. Follow the Maintenance procedures to remove the
valve from the line.
2. With the main valve out of the line, remove the
bolts securing the cap (2) to the body (1) and lift
the cap (2) straight up.
3. Lift the disc from the plate and place on a clean
surface with the seating side up.
4. Place the valve body on side. Hold on hand over
the plate to receive it and tap lightly on the back of
the plate with a soft, blunt object; push the plate
out evenly. Place the plate on a clean surface
seating side up.
NOTE: on 1/2” - 1-1/4” models, disc guide will also be
removed, and on 2-1/2” - 6” models, a disc spring will
be located in the cap.
Remove Main Valve
Diaphragm & Disc Pin
1. Remove the bottom cap. The spring and spring
guide will come out with it.
2. Disconnect the loading pressure tubing from the
upper bonnet, remove the bonnet bolts and upper
bonnet.
3. Lift out the diaphragm assembly consisting of the
diaphragm retainer, stroke stop shim (2-1/2” or 3”
valve size only,) diaphragm and diaphragm plate.
4. Fasten hub of diaphragm plate in a vise and
unscrew diaphragm retainer. Remove stroke stop
shim (where used) and diaphragm(s). Remove
stroke stop shim and diaphragms. 1/2” to 1-1/4”
has one diaphragm and 1-1/2” to 6” has two
diaphragms.
5. To remove stem and disc pin, hold the disc pin
with a wrench and loosen the locknut, unscrew the
stem.
6. Assemble valve in the reverse order of above,
following the procedure for stroke adjustment
outlined below.
Main Valve Stroke Adjustment
1. Do not tighten locknut on the stem; run it to the
upper end of the thread with the disc pin located at
about the center of the threaded section.
2. Place the plate and disc in the valve body so that
the disc pin protrudes through the center slot in
plate and engages the disc. Use the following as a
guide to properly install the plate and disc:
1/2” - 1-1/4” VALVE SIZES: The “V” stamp on the
side of the valve body locates the position of the
index pin hole in the face of the plate. The arrow
which is stamped on the disc should point to the
index pin hole. (Since the disc can be rotated
180° in some sizes without affecting the stroke
adjustment, there may be no arrow on the disc.)
Place disc guide over plate and disc so index pin
matches.
1-1/2” and 2” VALVE SIZES: Place the disc on the
plate and install the disc guide screws. Tighten
the screws but make sure that they do not bind
the disc against the plate. Place the assembly in
the valve body so that the orifices will be open
when the disc is stroked down. (With wording “TOP
REVERSE” on plate at the top nearest diaphragm.)
Engage the disc with the disc pin and check to be
sure that the plate seats solidly against the shoulder
in the valve body. Rotate the assembly slightly to
align the disc screws with the vertical centerline of
the valve. The arrow on the disc should be pointing
up to the working “TOP REVERSE” on the plate.
2-1/2” - 6” VALVE SIZES: The plates are stamped on
the backside with the wording “TOP DIRECT” and
“TOP REVERSE” to indicate their proper position in
the valve body. The wording “TOP REVERSE” is at
the top, nearest the diaphragm and the engraved
arrow on the disc always points to the wording
“TOP REVERSE” on the plate. Check that the index
pins in the valve body engage the plate to align the
plate in the body.
3. Place the diaphragm assembly on the stem with
the diaphragm in its recess in the lower bonnet.
Hold the diaphragm assembly firmly against the
stop in the lower bonnet and push on the bottom
of the stem so that it fully enters the socket in
the diaphragm’s retainer. In this position, the disc
should be in its lowermost position with the orifices
of the disc and plate fully aligned. If the orifices are
not fully aligned, rotate the stem clockwise to move
the disc up, or counterclockwise to move the disc
down.
4. When the orifices are perfectly aligned; remove the
disc and plate, and lock the locknut on the stem
against the disc pin. Replace the disc and plate
and recheck the orifice alignment.