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

Correct Installation: for effective temperature control, 1.
correct installation of the sensing bulb is essential.
For best results, the bulb should be installed at a
point of true representative temperature and where
there is good circulation. A thermometer 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
3. – When the bulb is to be
mounted horizontally, it must be turned so that the
word TOP (stamped on the adaptor) faces upward.
Vertical Mounting
4. – No special precaution is re-
quired when the bulb is mounted vertically pointing
down.
Inverted Mounting
5. – A special capillary is required
if the tip of the bulb will be higher than the capil-
lary end. The temperature regulator equipped with
a standard capillary will not function properly in an
inverted position.
Insertion
6. – For accurate control, the entire length 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 8” is suffi-
cient 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
obtained 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 temperatures.
When the bulb is installed at a point higher than the
9.
regulator itself, the range may be somewhat low-
ered. Conversely, the range may be raised if the bulb
is installed below the regulator.
Troubleshooting
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 valve may be jammed open. •
Foreign matter may be lodged in valve seats. •
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.
Undercooling or Overcooling
Be sure that coolant is circulating properly and that •
all steps have been taken as indicated for underheat-
ing or overheating as above.
Thermal System Failure
Thermal system failure is usually indicated by failure •
of the regulator to respond to temperature changes,
and when all other troubleshooting 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 or hot water, or cooled with cold
water or crushed ice. Observe the valve stem while
alternately heating and cooling the bulb. If the stem
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 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 cool- 2.
ing 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 ad-
6.
justing wheel downward to decrease and upward to
increase the temperature setting.
Valve Seats
A. Disassembly
The valve seats in all Jordan temperature regulators
are lapped to a light band flatness. Maintaining such
tolerances is of great importance for your assur-
ance of excellent control and tight shut-off. Do not
use metallic objects in removing the seats. Care in
handling is important. Improper handling will result
in leakage or improper control upon installation.
Close shut-off valve on each side of the regulator. 1.
Remove the control valve from the line. 2.
With the valve in the horizontal position, secure the 3.
body hex in a vise with the valve cap (1) on top.
Remove the cap bolts (2) and lift the cap (1) straight
4.
up.
Remove the pressure ring (8). Remove the disc and
5.
plate assembly (4, 3) from the valve body. Invert the