Jordan Valve Mark 85 Series - Controlled Failure Temperature Regulator - Manual (Page 2)

ing the valve seats in the open position. Inspect
and clean seats or replace them.
Check stroke adjustment.

Check for damage or failure of the thermal system. 
If You Experience Undercooling or Overcooling:
Be sure that coolant is circulating properly and that 
all steps have been taken as indicated for under-
heating or overheating in items 2 and 3 above.
If You Experience 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 cor-
rect the problem. The adjusting spring will hold a direct
acting valve CLOSED or reverse acting valve OPEN.
The thermal system can be tested by placing the sens-
ing bulb in a container which can be quickly heated with
steam or hot water, or cooled with cold water or crushed
ice. Observe the valve steam while alternately heating
and cooling the bulb. If the steam does not move, it is
likely that the thermal system has lost its fill. The thermal
system is hermetically sealed and cannot be repaired in
the field. It must be replaced by a complete, new ther-
mal system or the old unit must be repaired at the fac-
tory.
Start Up
Close the inlet and outlet shut-off valves. 1.
Slowly open the by-pass, and begin heating or 2.
cooling action.
Fully open the inlet shut-off valve. Then, slowly
3.
open the outlet shut-off valve.
Close the by-pass valves when the approximate
4.
temperature is reached.
Allow approximately 30 minutes to reach stable
5.
operation before attempting to adjust the tempera-
ture setting (and after each new setting).
To change the control temperature, rotate the ad-
6.
justing wheel downward to increase and upward to
decrease the temperature setting.
Body and cap bolts should be retightened per
7.
torque procedures after valve reaches operating
temperature.
Valve Seats
A. DISASSEMBLY
The valve seats in all Jordan regulators are lapped
to light band flatness. Maintaining such tolerances
is of paramount importance for your assurance of
excellent control and tight shut-off. Do not use
metallic objects in removing the seats. Care in
handling is imperative.
used) should be placed as close as possible to the
sensing bulb of the regulator.
Handle the capillary and armor carefully so they
2.
are not crushed, kinked, or twisted. A bend with a
radius of 4-1/2 pipe diameters or larger is recom-
mended.
HORIZONTAL MOUNTING - When the bulb is to be
3.
mounted horizontally, it must be turned so that he
word TOP and a center punch mark (stamped on
the adaptor) faces upward.
VERTICAL MOUNTING - No special precaution is
4.
required when the bulb is mounted vertically.
INVERTED MOUNTING - A special capillary is re-
5.
quired if the tip of the bulb will be higher than the
capillary end. The temperature regulator equipped
with a standard capillary will not function properly
in an inverted position.
INSERTION - For accurate control, the entire length
6.
of the bulb should be inserted. Avoid locating a
bulb in the direct path of steam or water. Never lay
the bulb on the bottom of a tank. Approximately
8D is sufficient distance from the source of heat or
coolant to the sensing bulb.
PIPELINE MOUNTING - When installing the sensing
7.
bulb in piping, be sure that the pipeline is at least
twice the diameter of the sensing bulb so that free
flow is obtained around the bulb.
FINNED BULBS - Finned bulbs should be installed
8.
at right angles to the air movement. Good circula-
tion 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 some-
what lowered. Conversely, the range will be raised
if the bulb is installed below the regulator.
Troubleshooting
If You Experience 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. 
Safety relief valve may be jammed open. 
Foreign matter may be lodged in valve seats. 
Valve stroke may be out of adjustment. 
If You Experience Underheating:
Be sure that shut-off valves are fully open. 
Be sure that inlet pressure is adequate. 
Clean line strainer screens. 
Clean steam traps and be sure that they are work- 
ing properly. If the return line from the trap is cool,
the steam coil may be clogged.
If You Experience Overheating:
Overheating is often caused by foreign matter hold- 
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