Valve seats, Diaphragm replacement – Jordan Valve Mark 60 Series - Sliding Gate Pressure Regulator User Manual
Page 2
Note: refer to the drawing at the end of this document for
description and proper orientation of parts.
Valve Seats
A. Disassembly
The seats of Jordan regulators are precision-lapped.
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.
1.
Close shutoff valve on each side of the regulator.
2.
Remove the regulator from the line.
3.
Secure the body hex in a vise. Remove the cap bolts (3)
and lift the cap (2) straight up.
4.
Remove the pressure ring (9). Remove the disc and plate
assembly (8/7) by lifting the assembly straight up from the
valve body. Place the assembly on the bench with the
disc (8) up.
It is imperative that the disc pin assembly is not rotated
when disassembling, cleaning or reassembling, since
this affects the stroke adjustment of the valve.
5.
Clean the plate seat with fine emery cloth. Clean the body
and cap cores with a good quality solvent.
6.
To clean the disc and plate, remove the guide screws
(10). Place 4/0 polishing cloth or jeweler’s cloth on a
smooth, flat surface and polish the lapped surfaces of the
disc and plate. If these parts are scarred, do not attempt to
relap them, but return them to Jordan Valve for repair or
replacement. The pressure ring (9) may be polished in the
same manner.
B. Reassembly
1.
Place the disc on the plate and replace the guide screws.
Tighten the guide screws but do not allow the screws to
bind the disc against the plate.
2.
Replace the disc and plate assembly and the pressure
ring. Make sure that the disc pin (4) engages the disc, and
that the plate seats solidly against the plate seat in the
body.
3.
With the adjusting screw (19) compressing the range
spring (16), check the orifice alignment of the disc and
plate. The orifices must be fully open and in perfect
alignment. If the orifices are not aligned, the disc pin (4)
has probably been rotated. Remove the disc and plate
assembly and rotate the disc pin to raise it or lower it for
proper alignment.
4.
If further adjustment of the disc pin does not provide
perfect alignment, proceed to “Valve Stroke Adjustment”.
5.
Once the orifices in the plate and disc are properly
aligned, place a straight edge across the body bolt holes
on the horizontal center line of the valve (perpendicular to
the valve movement.) Gently rotate the disc and plate
assembly until the edges of the orifice slots are parallel to
the straight edge and replace the cap, being careful not to
rotate the disc and plate assembly.
6.
Replace the cap and cap bolts, and tighten uniformly
being careful not to torque excessively. See recom-
mended torque values later in this document.
Diaphragm Replacement
A. Disassembly
1.
In removing the diaphragm (12), you must first remove the
valve disc and valve plate. This is outlined under “Valve
Seats” in the previous section.
2.
Remove the compression of the adjusting spring by
rotating the adjusting screw counterclockwise.
3.
Remove the spring housing screws (15) and spring
housing (14). Remove adjusting spring (16) and spring
seat (17).
4.
Hold the disc pin with an open end wrench and remove
the diaphragm assembly by rotating counterclockwise.
The diaphragm assembly consists of the upper dia-
phragm plate (13), diaphragm (12) and lower diaphragm
plate (11).
5.
If the diaphragm must be replaced, secure the upper
diaphragm plate in the vise. A face spanner wrench
should be used to remove the lower diaphragm plate
from the assembly. If a face spanner wrench is not
available, use a punch and hammer, but make certain to
remove all burrs prior to reassembling.
6.
Remove the diaphragm and replace in reverse order.
B. Assembly and Stroke Adjustment
1.
In assembly, note that the valve stroke adjustment is
determined by how far the diaphragm assembly is
screwed onto the stem. Holding the disc pin with an open
end wrench, screw the diaphragm assembly onto the
valve stem until the disc pin is centered in the valve body.
2.
Place the valve plate and the valve disc in the valve body,
using the same precautions as outlined under “Valve
Seats”.
3.
Push the diaphragm assembly down against the valve
body and check the orifice alignment of the disc and
plate. The orifices should be fully open and in perfect
alignment.
4.
If the orifices are not in perfect alignment, rotate the
diaphragm assembly counterclockwise to lower the valve
disc, and clockwise to raise the valve disc.
5.
The total stroke of the Mark 601/602 PRV is equal to the
orifice width plus 1/32" overlap. Consequently, perfect
adjustment is required for proper operation.
6.
After proper adjustment has been obtained, remove the
valve plate and valve disc to eliminate the possibility of
damage during topworks reassembly.
7.
Place adjusting spring and spring seat on the upper
diaphragm plate.
8.
Before replacing the spring housing, make certain that
the diaphragm is centered in the body recess. This same
recess aligns the spring housing.
9.
In replacing the spring housing, make certain that it seats
properly in this recess.
10. Replace the spring housing screws and tighten only
finger-tight. Thread the adjusting screw into spring
housing until the seats are in their fully open position.
Tighten the spring housing screws to torque values
shown later in this document.
11. Replace seats, pressuring ring, and cap.