172-65613A-03 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 11 Jun 2020
19
Troubleshooting
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
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 problems encountered in the operation of the DR8, consult the
troubleshooting guide below. Problems are classified as follows:
1. The secondary pressure does not increase
2. The secondary pressure cannot be adjusted or increases abnormally
3. Hunting (fluctuation of the secondary pressure) occurs
4. Chattering (a heavy mechanical noise) occurs
5. Abnormal noises
Major causes for the above problems are usage under non-specified conditions
(out of specification), insufficient pressure or flow rate, and clogs by dirt and scale.
To ensure performance for a long period of time, it is recommended that the
“Acceptable Operating Range”, “Correct Usage of the DR8 Direct-acting Pressure
Reducing Valve” and “Adjustment” sections be reviewed.
Problem
Symptom
Cause
Remedy
The
secondary
pressure
does not
rise
Pressure
does not
increase
No steam is being supplied
Check the primary/secondary
piping and valves of the unit
The valve at the primary side
is closed
The filter at the primary side is
clogged
Clean or blow down or replace
with a new filter
Flow rate exceeds
specifications
Check the flow rate; check the
model selection, replace with
a more suitable unit if
necessary*
The secondary pressure
exceeds the adjustable range
Check the model selection,
replace with a more suitable
unit if necessary*
The
secondary
pressure
cannot be
adjusted or
increases
abnormally
Adjustment
is difficult
and set
pressure
varies
The flow rate is too low
Check the flow rate; check the
model selection, replace with
a more suitable unit if
necessary*
Pressure fluctuation at the
primary side is large
Check the primary pressure;
check the model selection,
replace with a more suitable
unit if necessary*
Flow rate fluctuation is too
large
Check the flow rate, re-set the
pressure; check the model
selection, replace with a more
suitable unit if necessary*
The adjustment screw has
seized
Replace with a new
adjustment screw
*For model selection and replacement, contact TLV.
