Jordan Valve Mark 80 Series – Self Operated Temperature Regulator - Manual (Page 2)

If You Experience Overheating:
Overheating is often caused by foreign matter hold- 
ing the valve seats in the open position. Inspect
and clean seats or replace them.
Check stroke adjustment. 
Check or for damage or failure of the thermal sys- 
tem.
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 OPEN or reverse acting valve CLOSED.
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 ice. Ob-
serve the valve stem while alternately heating and cool-
ing the bulb. If the stem does not move, it is likely that
the thermal system has lost its fill. The thermal system
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 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 decrease and upward
to increase the temperature setting.
Body and cap bolts should be retightened per 7.
torque procedures after valve reaches operating
temperature.
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 valve by
bleeding pressure from the upstream side of the
valve.
When the pressure gauges indicate that all 3.
pressure has been removed from the system,
CORRECT INSTALLATION - For effective tempera- 1.
ture control, correct installation of the sensing bulb
is essential. For best results, the bulb should be
installed at a point of true representative tempera-
ture and where there is good circulation. A ther-
mometer or other temperature sensing device (if
used) should be placed as close as possible to the
sensing bulb of the regulator.
Handle the capillary and armor carefully so they are 2.
not crushed, kinked or twisted. A bend of 4-1/2”
radius or larger is recommended.
HORIZONTAL MOUNTING — When the bulb is to 3.
be mounted horizontally, it must be turned so that
the word TOP (stamped on the adapter) faces up-
ward.
VERTICAL MOUNTING — No special precaution is 4.
required when the bulb is mounted vertically point-
ing down.
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 6.
length of the bulb should be inserted. Avoid locat-
ing a bulb in the direct path of steam or water.
Never lay the bulb on the bottom of a tank. Approx-
imately 8” is sufficient distance from the source of
heat or coolant to the sensing bulb.
PIPELINE MOUNTING — When installing the sens- 7.
ing bulb in piping, be sure that the pipeline is at
least twice the diameter of the sensing bulb so that
the 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.
Trouble Shooting
If You Experience Erratic Control:
An oversized valve causes cycling or hunting. An 
under sized valve causes temperature to drop un-
der peak loads. Recalculate required size.
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. 
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.
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