TLV DR8-3EP, Instruction Manual

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172-65613A-03 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 11 Jun 2020
20
Problem Symptom Cause Remedy
The
secondary
pressure
cannot be
adjusted or
increases
abnormally Adjustment
is difficult
and set
pressure
varies The slide bearing is distorted
or damaged Replace with a new valve
guide (when replacing the
slide bearing or snap ring,
these parts need to be
replaced as a set with the
valve guide)
The diaphragm or protective
sheet is distorted or damaged Replace with a new
diaphragm and protective
sheet
The selected model is
inappropriate for the service
conditions (specifications) Check the model selection,
replace with a more suitable
unit if necessary*
Upon
closing the
valves at the
secondary
side, the
secondary
pressure
abruptly
rises as high
as the
primary
pressure The bypass valve is leaking Check, clean, and replace
with a new bypass valve if
necessary*
There is a build-up of dirt on
or damage to the valve or the
valve seat Clean and align
Hunting or
chattering
occurs Occurs at
low steam
demand Flow rate is too low Check the flow rate; check the
model selection, replace with
a more suitable unit if
necessary*
Hunting
never stops The reduction ratio is too high Use two-stage reduction
The selected model is
inappropriate for the service
conditions (specifications) Check the model selection,
replace with a more suitable
unit if necessary*
Chattering
never stops Condensate is entrained Install a separator or a steam
trap; check the piping
The selected model is
inappropriate for the service
conditions (specifications) Check the model selection,
replace with a more suitable
unit if necessary*
Abnormal
noises Makes a
high-pitched
noise The required pressure
reduction exceeds
specifications Use two-stage reduction
Flow rate exceeds
specifications Check the flow rate; check the
model selection, replace with
a more suitable unit if
necessary*
The valve installed close to
the reducing valve
opens/closes too quickly Install the valve at as great a
distance away as possible
*For model selection and replacement, contact TLV.
NOTE: When replacing parts with new, use the parts list for reference and replace with
parts from the Maintenance Kit, Repair Kit, etc. (Please note that replacement
parts are only available in pre-packaged kits.)