Chapter 7—AUXILIARY MACHINERY
2. If there is a gradual loss of pressure in the
lower dome, check the bleeder valve, the air-
loading connection, the pressure gage connection,
and the filling plug for air leakage.
3. If the reduced pressure builds up beyond
the set pressure, steam may be leaking past the
valve. Check the valve for wear and for the
presence of dirt or scale; also check to be sure that
the valve stem is not binding and holding the valve
open.
4. If the reducing valve closes and fails to
deliver steam, check the dome pressure gage. If
it reads the same as the outlet pressure gage, the
diaphragm has probably failed.
The procedures to be followed when a
reducing valve is being inspected, cleaned,
and repaired will depend upon the design
of the valve and its use. Therefore, the
maintenance of a specific reducing valve should
be accomplished in accordance with the instruc-
tions provided in the applicable manufacturer’s
technical manual.
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