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8. Troubleshooting
This product is shipped after stringent checks and inspection, and should perform its intended
function for a long period of time without failure. However, should there be any problem
encountered in the operation of the DR20/A-DR20, Consult the troubleshooting guide below.
Problem
The secondary
No steam/air is being supplied
pressure does
The valve at the primary side is closed
not increase
The entrance to the screens or strainer is clogged Clean or blow down
Flow rate exceeds specifications
It exceeds the adjustable pressure
range
Adjustment is
The flow rate is too low
difficult and set
pressure varies
Pressure fluctuation at the primary side
is large
Buildup on the valve stem prevents
smooth movement through the spacer
Flow rate fluctuation is too large
The adjustment handle has seized
The holes in the spacer are clogged
The slide bearing is distorted or
damaged
The bellows is distorted or damaged
The selected model is inappropriate for
the service conditions (specifications)
The bypass valve is leaking
There is a build-up of dirt on or damage
to the main valve or the valve seat
Hunting or chattering
The flow rate is too low
occurs at low
steam/air demand
Hunting never
There is too high a reduction ratio
stops
The selected model is inappropriate for
the service conditions (specifications)
Chattering
Condensate is entrained
never stops
The selected model is inappropriate for
the service conditions (specifications)
Makes a high-
The required pressure reduction exceeds specifications Use two-stage reduction
pitched noise
Flow rate exceeds specifications
The valve installed close to the reducing
valve opens/closes too quickly
Cause
̶ 15 ̶
Remedy
Check the primary/secondary piping
and valves of the unit
Check the flow rate; check the model selection,
replace with a more suitable unit if necessary
Check the model selection, replace
with a more suitable unit if necessary
Check the flow rate; check the model
selection, replace with a unit that has
smaller nominal diameter or a more
suitable unit if necessary
Check the primary pressure; check the
model selection, replace with a more
suitable unit if necessary
Clean and inspect the valve stem and
spacer
Check the flow rate, re-set the pressure;
check the model selection, replace with a
more suitable unit if necessary
Replace with a new adjustment handle
Clean
Replace with a new spacer (when replacing the
slide bearing or snap ring, these parts need to
be replaced as a set with the spacer)
Replace with a new bellows
Check the model selection, replace with
a more suitable unit if necessary
Check, clean, and replace with a new valve if necessary
Clean and align
Check the flow rate; check the model selection,
replace with a unit that has smaller nominal
diameter or a more suitable unit if necessary
Use two-stage reduction
Check the model selection, replace with
a more suitable unit if necessary
Install a steam trap; check the piping
Check the model selection, replace
with a more suitable unit if necessary
Check the flow rate; check the model selection,
replace with a unit that has larger nominal
diameter or a more suitable unit if necessary
Install the valve at as great a distance
away as possible
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