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11. Troubleshooting
English
If the expected performance is unachievable after installation of the steam trap, read chapters 5
and 6 again and check the following points to take appropriate corrective measures.
A bimetal element is damaged or broken
The assembly (orientation) of the bimetal
elements is incorrect
There is a build-up of foreign matter in the
spaces between the bimetal elements
The screen or piping are clogged with rust
and scale
The adjusting screw is not correctly
positioned
There is a build-up of dirt or scale on the
valve stem or seating surfaces of the valve
seat
The valve stem is worn or sealing surfaces
are damaged
The valve seat is worn or sealing surfaces
are damaged
The valve seat is loose
The valve seat gasket is damaged
Cause
Problem
No condensate is
discharged or
temperature
doesn’t rise to the
set temperature
There is leakage to
the outside of the
trap
Steam is blowing or
the temperature
rises above the set
temperature
The adjusting screw is not correctly
positioned
Leakage from the cap nut gasket: the
gasket or the seal ring is damaged or
deteriorated
Leakage from the adjusting screw: the
seal ring is damaged or deteriorated
Leakage from the cover gasket: the cover
gasket is damaged or deteriorated
Replace with a new bimetal
element
Correct the assembly of the
bimetal elements
Clean the bimetal elements
Clean parts
Readjust the screw
Use cleaning function
Replace with a new valve
stem
Replace with a new valve seat
Tighten to the proper torque
Replace with a new gasket
Remedy
Readjust the screw
Replace with a new gasket or
seal ring
Replace with a new seal ring
Replace with a new gasket
The valve seat is clogged with rust and
scale
Use cleaning function
NOTE: When replacing parts with new, use the parts list on page 5 for reference, and replace with
parts from the Maintenance Kit and/or Repair Kit. Please note that replacement parts are
only available as part of a replacement parts kit.
NOTE: - Coat all threaded portions with anti-seize.
- If drawings or other special documentation were supplied for the product, any torque
given there takes precedence over values shown here.
Torque
Distance Across
Flats
Tightening Torque and Distance Across Flats
Part
Cap Nut
Cover
mm
(in)
(lbf.ft)
N.m
(26)
35
24
(185)
250
(22)
30
46
( )
/
16
15
(1 )
/
16
13
19
( )
/
4
3
1 N.m 10 kg
・
cm
〜
〜
Valve Seat