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9. Troubleshooting
If the expected performance is unachievable after installation of the trap, read chapter 5 and
chapter 6 again and check the following points for appropriate corrective measures.
Problem
No condensate
Screen is clogged with rust or scale
is discharged
Air vent ring (bimetal) is broken or worn, causing
(blocked, or
air-binding
discharge is
Disc holder ring is broken or worn, causing air-
poor)
binding
Disc is sticking to valve seat (due to oil, etc.)
Steam-locking has occurred
Trap capacity is insufficient
Differential pressure is low
Steam leakage
Valve closure is obstructed by scale, etc.
or blowing
Disc or valve seat is worn
(from valve
Air vent ring (bimetal) or disc holder ring is
seat)
broken, obstructing valve closure
Back pressure exceeds allowable value
Trap is being used below minimum operating
pressure
Disc is sticking to top of cover (due to oil, etc.)
Valve
Foreign matter or oil film on disc or valve seat
chattering
Scratches on disc or valve seat
(Leakage)
Disc or valve seat is worn
Leakage from a
Bypass valve is damaged or open
location other
Cover is loose or module gaskets are
than valve seat
damaged
(via discharge,
Cover is loose or sealing surface between
or from
cover and valve seat is damaged
product body)
Connector bolts are loose or connector
gaskets are damaged
Inlet and discharge channels may be
connected, due to erosion
Screen holder is loose or screen holder
gasket is damaged
NOTE: When replacing parts with new, use the parts list on page 5 for reference, and replace with
parts from the appropriate kit. Please note that replacement parts are only available as part of a
replacement parts kit.
Cause
― 13 ―
Remedy
Clean
Replace air vent ring
Replace disc holder ring
Clean
Perform a bypass
blowdown, or close the trap
inlet valve and allow the trap
to cool. Piping correction
may also be required.
Change to trap of suitable
capacity
Study inlet/outlet pressure,
including rise in outlet pipe
Clean or replace screen
Replace worn parts
Replace air vent ring or disc
holder ring
Use within pressure range
Use within pressure range
Clean
Clean
Replace disc, valve seat, or
trap unit
Replace disc, valve seat, or
trap unit
Replace or close bypass valve
Tighten cover or replace
module gaskets
Tighten or replace cover, or
replace valve seat
Tighten connector bolts or
replace connector gaskets
Replace trap (study trap
capacity)
Tighten screen holder or
replace screen holder gasket
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