two nuts. Lift the cap straight up.
3.
Before removing, check the disc for a stamped arrow. This
arrow points to the “<”on the body.
.
(NOTE: certain discs that can be rotated 180° without
affecting the stroke might not have an arrow.)
4.
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.
5.
Invert the body and lightly tap on the exterior to remove the
plate. Let the plate drop out into your hand, and place it on
the bench with the lapped surface facing up.
6.
Clean all of the parts, body and cap with solvent. 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 relap them, but return
them to the factory for repair or replacement. Often parts
can be repaired at a minimal cost if the parts are not scarred
too deeply.
7.
The vertical sections of the disc guide serve as guides for
the disc while stroking. A 0.005 feeler gauge should be
used to check for clearance between 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.
Start-Up
Valve Maintenance
Caution: Make certain that there is no pressure in the valve
before loosening any fittings or joints. The following steps
are recommended:
1.
Close the inlet shutoff valve.
2.
Allow pressure to bleed off through downstream piping.
Do not attempt to reverse the valve by bleeding pressure
from the upstream side of the valve.
3.
When the pressure gauges indicate that all pressure 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 document for
description and proper orientation of parts.
Valve Seats
A.
DISASSEMBLY
Stem, Disc & Pin Replacement
B.
REASSEMBLY
1.
Fully open the outlet shutoff valve.
2.
Slowly open the inlet shutoff valve.
3.
Do not fully open the inlet shutoff valve until you are sure
that the controller and control valve have control of the
system.
1.
Follow the Maintenance Procedure and remove the valve
from line.
2.
Note the scribes “<” on the side of the valve body and cap.
Secure the body flats in a vise. Remove the cap bolts and
1.
Place the plate in the body, lapped surface facing 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
extensions if the disc pin is cast).
2.
Place the disc on the valve plate, engaging the disc pin.
The arrow on the disc should point to the index pinhole.
Insert the index pin in the hole.
3.
Place the disc guide onto the valve plate, engaging the
index pin. Rotate the assembly slightly until the slot
openings in the disc are parallel to the openings in the
plate and perpendicular to the stem. Stroking the valve will
aide in this alignment.
4.
Align the “>” on the cap with the “<” on the body, and place
the cap over the two studs in the body.
5.
Install the nuts and cap bolts. Tighten uniformly. See back
page for torque requirements and tightening procedures.
Repeat disassembly and reassembly per “A” and “B”
above for the second set of seats
1.
Remove the disc and plate, following the procedure
outlined under VALVE SEATS.
2.
Loosen the stem connector nut and bolt and remove
connector.
3.
Back out the four allen head yoke screws, which will allow
the body to be separated from the yoke.
4.
Remove the packing flange nuts and the packing flange.
5.
Loosen the stem locknut and rotate the disc-pin counter-
clockwise, pulling the valve stem upward while doing so.
6.
When pulling the stem completely out of the body you will
remove most of the packing assembly also. The remaining
parts of the packing assembly can “fished” out with a small
screwdriver.
Cap
Disc Guide
Valve Disc
Valve Plate
Studs (2)
Hex Nuts (2)
Cap Screws
Disc Pin
Index Pin
19
18
17
16
14
21
20
Body
12
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.
