Chapter 7—AUXILIARY MACHINERY2. If there is a gradual loss of pressure in thelower 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 beyondthe set pressure, steam may be leaking past thevalve. Check the valve for wear and for thepresence of dirt or scale; also check to be sure thatthe valve stem is not binding and holding the valveopen.4. If the reducing valve closes and fails todeliver steam, check the dome pressure gage. Ifit reads the same as the outlet pressure gage, thediaphragm has probably failed.The procedures to be followed when areducing valve is being inspected, cleaned,and repaired will depend upon the designof the valve and its use. Therefore, themaintenance of a specific reducing valve shouldbe accomplished in accordance with the instruc-tions provided in the applicable manufacturer’stechnical manual.7-35
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