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 4 and
chapter 5 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 (HR80A)
Clean
Valve closure is obstructed by scale, etc.
Clean or replace screen
Replace worn parts
Clean
Replace air vent ring
(HR80A)
Disc holder ring is broken or worn, causing air-
binding (HR80A)
Replace disc holder ring
(HR80A)
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 (HR80A)
Replace air vent ring or disc
holder ring (HR80A)
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
Cover is loose or module gaskets are
damaged
Tighten cover or replace
module gaskets
Scratches on disc or valve seat
Replace disc or module
valve seat
Disc or valve seat is worn
Replace disc or module
valve seat
Bypass valve is damaged or open
Replace or close bypass valve
NOTE: When replacing parts with new, use the parts list on page 3 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.
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