Jordan Valve Mark 89 Series- Three-Way Temperature Regulator - Manual (Page 2)

or hot water, or cooled with cold water or crushed ice. Ob-
serve the valve stem while alternately heating and cooling
the bulb. If the stem does not move, it is likely that the ther-
mal system has lost its fill. The thermal system is hermeti-
cally sealed and cannot be repaired in the field. It must be
replaced by a complete, new thermal system or the old unit
must be repaired at the factory.
Start Up
Close the inlet and outlet shut-off valves. 1.
Slowly open the by-pass, and begin heating or cooling 2.
action.
Fully open the inlet shut-off valve. Then slowly open
3.
the outlet shut-off valve.
Close the by-pass valves when the approximate tem-
4.
perature is reached.
Allow approximately 30 minutes to reach stable op-
5.
eration before attempting to adjust the temperature
setting (and after each new setting).
To change the control temperature, rotate the adjust-
6.
ing wheel downward to decrease and upward to in-
crease the temperature setting.
Valve Seats
A. Disassembly
The valve seats in all Jordan regulators are lapped to
a light band flatness. Maintaining such tolerances is of
great importance for your assurance of excellent con-
trol and tight shut-off. Do not use metallic objects in
removing the seats. Care in handling is important.
Close shut-off valve on each side of the regulator. 1.
Remove the regulator from the line. 2.
Note the scribe line on the side of the valve body and 3.
the caps. Secure one of the outlet cap hexes (1) in a
vise. Remove the cap screws (2) from the other cap
and lift the cap straight up. Please note that there is
an index pin secured in the valve cap that fits into the
index pin hole in the valve plate (3).
Next remove the valve plate and place it on the bench
4.
with the lapped surface up. You will notice that there
is also a locating pin which aligns the valve plate with
the disc guide. The scribe line on the outside of the
valve cap and the valve body indicates that this locat-
ing pin should be on this side.
Now remove the valve disc (4) and the disc guide (5),
5.
placing the valve disc on the bench with the lapped
surface up. Finger-tip pressure should be sufficient to
remove these parts.
NOTE: It is imperative that the disc pin is not rotated
in disassembly, cleaning, or reassembly, since this af-
fects the stroke adjustment of the valve.
IMPROPER HANDLING OF THE SEATS WILL RESULT
IN LEAKAGE OR IMPROPER CONTROL
Clean all parts of the body and cap with a good qual- 6.
ity solvent. The valve disc and the valve plate may
end. The temperature regulator equipped with a stan-
dard capillary will not function properly in an inverted
position.
Insertion
6. - For accurate control, the entire length of
the bulb should be inverted. Avoid locating a bulb in
the direct path of steam or water. Never lay the bulb
on the bottom of a tank. Approximately 8” is sufficient
distance from the source of heat or coolant to the
sensing bulb.
Pipeline Mounting
7. - When installing the sensing bulb
in piping, be sure that the pipeline is at least twice the
diameter of the sensing bulb so that free flow is ob-
tained around the bulb.
Finned Bulbs
8. - Finned bulbs should be installed at
right angles to the air movement. Good circulation is
required to sense the average temperature.
When the bulb is installed at a point higher than the
9.
regulator itself, the range will probably be somewhat
lowered. Conversely, the range will be raised if the
bulb is installed below the regulator.
Trouble Shooting
Erratic Control:
An oversized valve causes cycling or hunting. An 
undersized valve causes temperature to drop under
peak loads. Recalculate required size from Jordan
Catalog TCV.
Inlet pressure may be low.

Steam traps downstream may need reconditioning. 
Foreign matter may be lodged in valve seats. 
Valve stroke may be out of adjustment. 
Underheating:
Be sure that by-pass Seats are fully open. 
Be sure that inlet pressure is adequate. 
Clean line strainer screens. 
Clean steam traps and be sure that they are working 
properly. If the return line from the trap is cool, the
steam coil may be clogged.
Overheating:
Overheating is often caused by foreign matter holding 
the by-pass seats in the open position. Inspect and
clean seats or replace them.
Check stroke adjustment.

Check for damage or failure of the thermal system. 
Undercooling or Overcooling:
Be sure that coolant is circulating properly and that all 
steps have been taken as indicated for underheating
or overheating in items 2 and 3 above.
Thermal System Failure:
Thermal system failure is usually indicated by failure of the
regulator to respond to temperature changes, and when
all other trouble shooting steps have failed to correct the
problem. The adjusting spring will hold a direct acting valve
OPEN or reverse acting valve CLOSED.
The thermal system can be tested by placing the sensing
bulb in a container which can be quickly heated with steam
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