Jordan Valve Mark 62 Series - Internally Piloted Regulator - Manual (Page 2)

Before removing, check the disc for a stamped 4.
arrow. This arrow points to the “<”on the body.
(NOTE: certain discs that can be rotated 180° with-
out affecting the stroke might not have an arrow.)
Remove the disc guide (18) by lifting straight up.
Also lift straight up on the disc. Place the disc on
the bench, lapped surface facing up. Protect the
lapped surfaces on both sides of the disc guide.
It is imperative that the disc pin assembly (disc pin,
stem and locknut) is not rotated when disassem-
bling, cleaning or reassembling, since this will affect
the stroke adjustment of the valve.
Invert the body and lightly tap on the exterior to 5.
remove the plate. Let the plate drop out into your
hand, and place it on the bench with the lapped
surface facing up.
Clean all of the parts, body and cap with solvent.
6.
Place a piece of 4/0 polishing cloth or jewelers
cloth on a smooth, flat surface, and polish the
lapped seating surfaces of the disc, plate, and disc
guide 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. (Of-
ten seats can be repaired at a minimal cost if the
parts are not scarred too deeply.)
The vertical sections of the disc guide serve as
7.
guides for the disc while stroking. A 0.005 feeler
gauge should be used to check for clearance be-
tween this surface and the side of the disc. If the
clearance is less, clean the guide surfaces in the
disc guide with a fine file.
B. Reassembly and Stroke Adjustment
Place the plate in the body, lapped surface facing 1.
the cap. The index pin hole should be on the same
side of the body as the “<” on the body. Align the
disc pin so that it is centered in the body bore and
that it protrudes through the center slot in the valve
plate (this should be the longer of the two exten-
sions if the disc pin is cast).
Place the disc on the valve plate, engaging the disc
2.
pin. The arrow on the disc should point to the in-
dex pinhole. Insert the index pin in the hole.
Place the disc guide onto the valve plate, engaging
3.
the index pin. Rotate the assembly slightly until the
slot openings in the disc are parallel to the open-
ings in the plate and perpendicular to the stem.
Stroking the valve will aide in this alignment.
Turn the adjusting screw to compress the spring
4.
and open the pilot valve.
To check the stroke adjustment, blow air into the in-
5.
let pilot connection (at the strainer). The main valve
will stroke to the open position, and the orifices
should be in perfect alignment. If they are not, then
an adjustment is required.
If valve will not operate:
Diaphragm ruptured. 
Adjusting Spring broken. 
Improper Spring setting. 
Upstream Pilot Tube Clogged. 
Start Up
A minimum of 15 psi deferential is required be- 1.
tween the upstream and downstream pressures for
operation of the PPRV.
Open the inlet shut-off valve.
2.
Slowly open and close the outlet shut-off valve sev- 3.
eral times to stroke the valve and insure satisfac-
tory operation.
To change the controlled pressure, turn the adjust-
4.
ing screw counterclockwise to decrease the pres-
sure and clockwise to increase the pressure.
Body and cap bolts should be retightened per
5.
torque procedures after valve reaches operating
temperature.
Maintenance
Caution: Make certain that there in no pressure in the
valve before loosening any fittings or joints. The fol-
lowing steps are recommended:
Close the inlet shutoff valve. 1.
Allow pressure to bleed off through the down- 2.
stream piping. Do not attempt to reverse the flow
through the valve by bleeding pressure from the
upstream side of the valve.
When the pressure gauges indicate that all pres-
3.
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 docu-
ment 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.
Follow the Maintenance Procedure and remove the 1.
valve from line.
Remove the inlet pilot tube and the outlet pilot
2.
tube.
Note the scribes “<” on the side of the valve body
3.
and cap. Secure the body flats in a vise. Remove
the cap bolts and two nuts. Lift the cap straight up.
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