Jordan Valve Mark 56 Series – Air Loaded Back Pressure Regulator - Manual (Page 4)

ing flange over the packing follower and
insert the packing bolts. Pull the bolts down,
one turn each, alternating from one to the
other until the packing follower is snug
against the body and the packing flange is
parallel to the body surface.
5. Remove the diaphragm and replace with a new
one in reverse order. Tighten. For elastomer dia-
phragms, clean (degrease) threads and apply one
drop of Loctite #290. Thread the parts together
and tighten 1/8 to 1/4 turn. Proceed to Stroke Ad-
justment.
Stem and Disc Pin Replacement
1. Remove the disc and plate, following the proce-
dures outlined under Valve Seats.
2. Remove the diaphragm as outlined under Dia-
phragm Replacement.
3. Holding the disc pin assembly with an open end
wrench, loosen the stem locknut. The stem can
now be unscrewed from the disc pin and removed.
4. Remove the disc pin and locknut.
5. Check the condition of and clean all parts. Clean
the stem guide bushing in the body and replace
defective parts.
6. Reassemble in reverse order. Follow the proce-
dures outlined under Stroke Adjustment.
Stroke Adjustment
Note: the valve adjustment is determined by how far the
diaphragm assembly is screwed onto the stem.
1/2” - 2” sizes
1.
With the upper diaphragm case off and seats out
of the body, hold the disc pin with an open end
wrench and screw the diaphragm assembly onto
the stem all the way, and then back off two turns
initially.
2. Place the disc guide, disc and plate in the body, as
outlined under Valve Seats.
3. Install the upper diaphragm case with only two
bolts 180° apart, and tighten these bolts.
4. Carefully use a tool to pry up on the disc pin from
upstream side of body. Stroke the stem upward un-
til the upper diaphragm late stops against the upper
diaphragm case.
5. The orifices should be fully open and in perfect
alignment. If they are not, remove the upper dia-
phragm case and rotate the diaphragm assembly
counterclockwise to lower the disc, or clockwise to
raise the disc. Repeat steps 3,4 & 5 until the seats
are in perfect alignment.
6. Install all the bolts in the upper diaphragm case and
torque as outlined under Torque Procedure on the
back page.
2-1/2” to 6” sizes
1. With the upper diaphragm case off and the seats
out of the body, loosen the stem locknut and move
the disc pin to the center of the threaded section of
the stem.
2. Hold the stem lightly with pliers and thread the dia-
phragm assembly approximately four turns onto the
stem. Center the disc pin in the body waterway and
tighten stem locknut.
3. Place the plate in the body as outlined under Valve
Seats, but temporarily install the disc on the disc
pin with the arrow pointing towards the diaphragm.
4. Hold the parts so they don’t fall out, and push down
on the diaphragm assembly until it bottoms out in
the body.
5. The orifices should be fully open and in perfect
alignment. If they are not, rotate the diaphragm
assembly counterclockwise to lower the disc, or
clockwise to raise the disc, until the seats are in
perfect alignment.
6. After the seats are aligned, remove the disc and
turn it 180° and reinstall with the arrow pointing
away from the diaphragm. The seats are now fully
closed with overlap.
7. Install the upper diaphragm case and torque the
bolts as outlined under Torque Procedure.
Caution: do not rotate the upper diaphragm case on the
diaphragm before installing the bolts because this will
change the stroke adjustment.
Torque Procedures
-4-
5 3
1
6 4
2
5
3
1
6 4
2
7
8
6 bolts
(or multiples)
8 bolts
(or multiples)
Torque for Bolts Connecting Cap to Body (in. - lbs.)
(1/2” - 2”)
Valve Size
Valve Body Material
Bronze
Ductile Iron, Carbon Steel,
or Stainless Steel
1/2” through 2” 140 200
Torque for Diaphragm Case Bolts
Valve Size Torque (in. - lbs.)
1/2” through 2” 200
1.
Install all bolts hand-tight.
2.
Torque the bolts in order of the bolt pattern to a
value equal to ¼ of the recommended torque value.
3.
Re-torque each bolt to the recommended value us-
ing the same bolt pattern as shown.
Torque for Bolts (ft. - lbs.) (2-1/2” - 6”)
Recommended Bolt Torque
Body to Cap 90 ft./lbs.
Diaphragm Case 85 ft./lbs.