Jordan Valve Mark 52 Series – Internally Piloted Regulator - Manual (Page 2)

in the body.
Before removing check the valve disc (8) for a
4.
stamped arrow. This arrow points to the scribe
marking >< and the index pin hole in the valve
plate. Since the disc can be rotated 180º in some
sizes without affecting the stroke adjustment, there
may be no arrow on the valve disc. Remove the
valve disc and place on bench with the lapped sur-
face up.
Lightly tapping on the valve body is usually suf-
5.
ficient to loosen a stuck plate (10) or disc guide
guide (9). Invert the body so that the seat set will
drop into your hand.
IMPROPER HANDLING OF THE SEATS WILL RESULT
IN LEAKAGE OR IMPROPER CONTROL.
Clean out all parts of the body and cap with sol- 6.
vent. The valve disc and plate may then be cleaned.
Place a piece of 4/0 polishing paper or jeweler’s
cloth on a smooth, flat surface such as a surface
plate and polish the lapped surfaces with a “figure
eight” motion. If parts are scarred, do not attempt
to re-lap them, but return them to the factory for
repair or replacement. If seats are not scarred
deeply they can be refinished several times at mini-
mum cost.
The vertical milled portions of the valve cap serve
7.
as a guide for the disc while stroking. A 0.0005
feeler gauge should be used to check the clear-
ance between the valve disc and disc guides. To
do so, place the valve disc in the cap disc guides
with the lapped surface facing upwards and check
this clearance. If the clearance is less than 0.005”,
clean the disc guide with a smooth file.
B. REASSEMBLY
Replace the valve plate. In replacing, make certain 1.
that the index pin hole is on the same side as the
scribe marking >< on the valve body. Align the disc
pin so that it is centered in the body bore and pro-
trudes upward through the slot in the plate.
In replacing the vale disc, the stamped arrow
2.
should be pointing to the scribe line on the valve
body. Place the valve disc on the valve plate, en-
gaging the disc pin.
Turn the adjusting screw (28) counter clockwise to
3.
release spring compression, thus opening the pilot
valve.
To check the stroke adjustment, blow air into the
4.
inlet connection. The main valve will stroke to the
open position, and the orifices should be open and
in perfect alignment. If they are not, an adjustment
is required.
To obtain the proper adjustment, remove the valve
5.
plate and disc from the valve body and loosen
the stem locknut (18). Adjustment is obtained by
reached, the adjusting spring overcomes the force of the
pressure beneath the pilot diaphragm and the pilot and
main valves close.
Start-Up Procedure
With the inlet and outlet shut-off valves closed:
Throttle the bypass valve so that the pressure to be 1.
controlled is maintained near the set point.
Slowly open the inlet shut-off valve.
2.
Open the outlet shut-off valve. 3.
Slowly close the bypass valve, but do not close it 4.
fully until you are certain that the regulator has con-
trol of the system.
To change the controlled pressure, turn the adjust-
5.
ing screw clockwise to increase pressure, counter-
clockwise to decrease pressure.
Body and cap bolts should be retightened per
6.
torque procedures after valve reaches operating
temperature.
Maintenance
CAUTION: Be sure that there is not pressure in the
valve before loosening any fittings or joints. The fol-
lowing steps are recommended:
Close the inlet shut-off valve. 1.
Release the compression of the adjusting spring by 2.
turning the handwheel counter-clockwise until free.
(This allows the pilot valve to open and release the
pressure on the inlet of the valve.)
Allow pressure to bleed off downstream from the
3.
regulator.
Close the outlet shut-off valve.
4.
Valve Seats
The seats of Jordan regulators are lapped to light
band flatness. Maintaining such tolerances is of par-
amount importance for your assurance of excellent
control and dead end shut-off. DO NOT use metallic
objects in removing the seats. Care in handling is
imperative.
A. DISASSEMBLY
Close the shut-off valve on each side of the regula- 1.
tor.
Remove the regulator from the line.
2.
Note the scribe marking >< on the side of the 3.
valve body (15) and cap (7). Secure the outlet body
hex in a vise. Remove the cap screws (11) and lift
the cap straight up. Please note that there is an
index pin secured in the cap (7). This index pin is
on the same side as the scribe marking >< on the
valve cap and body and it positions the valve plate
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