15
TROUBLE SHOOTING GUIDE
PROBLEM: TEMPERATURE REMAINS BELOW THE DESIRED CONTROL POINT
CAUSES
CORRECTIONS
1.
Adjusting setting too low.
1. Raise setting.
2.
Bulb at hot location.
2. Relocate bulb to more representative
average temperature location or add agitation.
3.
Stem adjustment too long.
3.
Readjust.
(Closes with temperature increase)
4.
Valve size too small.
4. Replace valve with larger size.
5.
Valve inlet pressure too low.
5.
Increase supply pressure.
6.
Heat exchanger not large enough.
6.
Replace with proper capacity.
7.
Faulty steam trap.
7.
Install trap of proper capacity.
8.
Heat exchanger not large enough.
8.
Replace with proper capacity.
(Opens with temperature increase)
9.
Foreign material under seats holding the
valve seat open.
9.
Heat the bulb to open the valve and allow
it to open further.
10.
Erosion of seats with resulting high
leakage.
10.
Repair or replace valve body assembly.
11.
Pressure drop across the valve is too high.
11. Reduce pressure drop or replace single
seated valve with double seated.
12.
Stem moves into body to close valve.
12.Change to stem moves into body to open
valve.
