Figure 4.
Air Loading Arrangement for Removing Stem Nuts
PRESSURE
GAGE
FRICTION HERE PREVENTS STEM
TURNING WHILE REMOVING STEM NUTS
NO. 5B RESTRICTION ELBOW
PET COCK
AIR OR WATER
LOADING
PRESSURE
NEEDLE VALVE OR SCHRADER NO. 645
AIR VALVE FOR USE WITH HAND PUMP
CARBON DIOXIDE CYLINER
11
Troubleshooting
Failure to Open
1. The setting of adjusting springs may have been
tampered with.
2. Initial pressure may be down due to partially-closed
supply valve, clogged strainer or other obstruction.
3. Bleedport may have been omitted and an open
coupling is substituted.
4. Orifice in No. 5A restriction may be plugged.
5. Control pipe on pilot may be plugged. Most likely,
points of obstruction are at shutoff valve and
entrance to delivery main valve.
6. Make sure the heater is properly trapped and free
of condensate.
7. Pilot or main valve diaphragms may be broken.
Check for leakage around the stem between the
lever and the diaphragm on pilot. Check the main
valve with air pressure in the diaphragm chamber
before dismantling.
8. Leak in the thermostat bulb may allow heated
fluid pressure, if sufficiently high, to back up into
thermal system to hold the pilot closed.
Complete dismantling at regular intervals for inspection
and repair is not recommended. Under normal
conditions, if kept relatively free of dirt, a regulator will
function year after year with minimum maintenance
attention. These service points are suggested:
1. After the first few days and thereafter twice a year,
inspect for dirt collected at:
a. Bleedport orifice - screwed into the downstream
side of the main valve.
b. Restriction orifice - screwed into the underside
of the main valve Types E and E5. Type E2
main valve has an open elbow without orifice.
2. After the first few days of operation and thereafter
twice a year, inspect all flanges and screwed
joints for leakage. Tighten all bolts. Never allow a
leak to persist.
3. Do not, in under any circumstances, loosen the
bolts on the temperature diaphragm chamber or
attempt to dismantle the thermostat element. The
system is filled with a volatile fluid which if lost, will
render the pilot inoperative. A damaged element,
however, can easily be changed in the field by
following the directions in Form SIOI12B.
6
ET124 and ET134 Series
