Jordan Valve Mark 33 Series – Boiler Feedwater Control Valve - Manual (Page 2)

Start-Up
Be sure that the action of the control valve and of 1.
the controller are such as to give the desired results.
With the inlet, outlet and bypass shutoff valves
2.
closed, and no pressure in the downstream line, fully
open the outlet shutoff valve. Slowly open the inlet
valve just enough to start flow through the control
valve. Increase flow gradually by slowly opening the
inlet shutoff valve. Do not fully open the inlet valve
until you are sure that the controller and control
valve have control of the system. Usually the hand-
wheel on the inlet valve will turn freely when this
point is reached.
To shutoff the line fluid, close the inlet shutoff valve
3.
first, then the outlet shutoff valve.
Maintenance
Caution: Make certain that there is no pressure in the
valve before loosening any fittings or joints. The fol-
lowing steps are recommended:
Close inlet shutoff valve. 1.
Allow pressure to bleed off through downstream 2.
piping. Do not attempt to reverse the flow through
the valve by bleeding pressure from the upstream
side of the valve.
When the pressure gauges indicate that all pressure
3.
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 docu-
ment for description and proper orientation of parts.
Valve Seats
A. Disassembly
The seats of Jordan valves are precision-lapped. Main-
taining 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.
Close the shutoff valve on each side of the control 1.
valve, and remove the valve from line.
Note scribed “<” on the side of the valve body and
2.
cap. Secure the body outlet flats in a vise. Remove
the cap bolts and two nuts, and lift the cap straight
up.
Before removing, check the valve disc for a stamped
3.
arrow. This arrow points to the “<” on the body.
Remove the disc guide and the valve disc. Place the
valve disc on the bench with lapped surface facing
up. Protect the lapped surfaces on both sides of the
disc guide.
It is imperative that the disc pin is not rotated
when disassembling, cleaning or reassem-
bling, since this affects the stroke adjustment
of the valve.
Lightly tap on the body to remove the valve plate. 4.
Invert the body, let valve plate drop out into your
hand, and place it on the bench with lapped surface
facing up.
Clean all the parts, body and cap with solvent. Place
5.
a piece of 4/0 polishing cloth or jewelers cloth on
a smooth, flat surface such as surface plate, 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. If the
seats are not scarred deeply, they can be repaired at
a nominal cost.
The vertical sections of the disc guide serve as
6.
guides for the valve disc while stroking. A 0.005
feeler gauge should be used to check for clearance
between this surface and the side of the valve disc. If
the clearance is less, clean the guide surfaces in the
disc guide with a fine file.
B. Reassembly
Place the valve plate in the body, lapped surface 1.
facing the cap. The index pin hole should be on the
same side as the “<” on the body. Align the disc pin
so that it is centered in the body bore and protrudes
through the center slot in the valve plate.
Place the valve disc on the valve plate, engaging the
2.
disc pin. The arrow on the disc should point to the
“<” on the body.
Place the disc guide onto the valve plate, engaging
3.
the index pin. Rotate the assembly slightly until the
slot openings in the valve disc are parallel to the
openings in the valve plate, and perpendicular to the
valve stem. Stroking the valve will aide in this align-
ment.
Align the “>” on the cap with the “<” on the body,
4.
and place the cap over the two studs in the body.
Install the nuts and cap bolts. Tighten uniformly. See
5.
torque requirements and tightening procedures.
Disc Pin
Index Pin
Cap Screws
Hex Nuts
Body
Studs
Valve Plate
Valve Disc
Disc Guide
Cap