Valve
chattering
(Leakage)
Leakage from a
location other
than valve seat
(via discharge,
or from
product body)
Foreign matter or oil film on disc or valve seat
Clean
Tighten cover, or replace
trap
Inlet and discharge channels may be
connected, due to erosion
Replace trap (study trap
capacity)
Screen holder is loose or screen holder
gasket is damaged
Tighten screen holder or
replace screen holder gasket
Cover is loose or seat surface between cover
and valve seat is damaged
Scratches on disc or module valve seat
Replace disc or trap
Disc or valve seat is worn
Replace disc or trap
Bypass valve is damaged or open
Replace or close bypass
valve
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.
Problem
Remedy
No condensate
is discharged
(blocked) or
discharge is
poor
Steam leakage
or blowing
(from valve
seat)
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.
Cause
Screen is clogged with rust or scale
Disc is sticking to valve seat (due to oil, etc.)
Air vent ring (bimetal) is broken or worn, causing
air-binding
Clean
Valve closure is obstructed by scale, etc.
Clean or replace screen
Replace worn parts
Clean
Replace air vent ring
Disc holder ring is broken or worn, causing air-
binding
Replace disc holder ring
Disc or valve seat is worn
Use within pressure range
Back pressure exceeds allowable value
Clean
Disc is sticking to top of cover (due to oil, etc.)
Steam-locking
Correct piping
Trap capacity is insufficient
Change to trap of suitable
capacity
Trap is being used below minimum operating
pressure
Use within pressure range
Differential pressure is low
Study inlet/outlet pressure,
including rise in outlet pipe
Air vent ring (bimetal) or disc holder ring is
broken, obstructing valve closure
Replace air vent ring or disc
holder ring
― 13 ―
English
