Jordan Valve Mark 57 Series – Externally Piloted Regulator - Manual (Page 3)

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3. Lift out the diaphragm assembly consisting of the
diaphragm retainer, stroke stop shim (2 ½ or 3”
valve size only), diaphragms and diaphragm plate.
4. Fasten the hub of diaphragm plate in a vise and
unscrew diaphragm retainer. 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. Lift the stem out through the bonnet and pull
the disc pin through the body bore.
6. Assemble valve in the reverse order of above, fol-
lowing the procedure for MAIN VALVE STROKE
ADJUSTMENT.
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
the plate and engages the disc. Use the following
as a guide to properly install the plate and disc.
• ½” THROUGH 1 ¼” VALVE SIZES- The scribed
line 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.) The vertical milled por-
tion of the disc guide serves as a guide for the
disc. A 0.005” feeler gauge should be should
be used to check the clearance between the
valve disc and disc guides. If the clearance is
less, clean the guide surfaces of the disc guide
with a fine file.
• 1 ½” 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 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 diaphragm.
• 2 ½” THROUGH 6” VALVE SIZES- The plate
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 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 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.
Torque Procedure for Cap and
Spring Housing Bolts
1. Install all bolts hand-tight.
2. Torque the bolts in order of the bolt pattern to
a valve equal to ¼ of the recommended torque
valve.
3. Re-torque each bolt to the recommended valve us-
ing the same bolt pattern as shown.
5 3
1
6
4
2
5
3
1
6 4
2
7
8
6 bolts
(or multiples)
8 bolts
(or multiples)
Torque Values
½” - 2” Body/Cap: 200 In. - Lbs.
Upper Bonnet: 240 In. - Lbs.
Pilot Dome: 350 In. - Lbs.
2½” - 6” Body/Cap: 1080 In. - Lbs. (90 Ft. - Lbs.)
Upper Case: 240 In. - Lbs.
Pilot Dome: 350 In. - Lbs.