TLV PN-COSR-16, Инструкция по эксплуатации

Страница: 25 / 26

172-65604MA-00 (
PN-COSR
Pneumatic Control Valve) 10 Sep 2014
24
Problem Symptom Cause Remedy
The small hole in the
piston is clogged Clean
There is a build-up of dirt
on the sliding surfaces of
the pilot valve, piston or
main valve Clean
The setting for the motive
air is inappropriate Check the motive air supply
line; check the set pressure
Flow rate exceeds rated
flow rate Check the flow rate,
replace with a larger size
The adjustment screw has
seized Replace with a new
adjustment screw
The diaphragm is
distorted or damaged Replace with a new
diaphragm
There is fluctuation in
steam consumption Check the flow rate;
replace the
PN-COSR-16
if necessary
Adjustment is
difficult, and set
pressure varies
The
PN-COSR-16
is
inappropriate for the
service conditions
(specifications)
Check the model
selection, replace the
PN-
COSR-16
if necessary
The bypass valve is
leaking Check, clean, and replace
with a new bypass valve if
necessary
The secondary
pressure
cannot be
adjusted or
increases
abnormally
Upon closing the
valves on the
secondary side,
the secondary
pressure abruptly
rises as high as
the primary
pressure
There is a build-up of dirt on
or damage to the pilot valve
seat or main valve seat Clean
Align
Replace if necessary
Occurs at low
steam demand It is being used below the
minimum adjustable flow
rate Replace with a smaller
size
There is too high a reduction
ratio (operated at below 10%
of the primary pressure) Use two-stage reduction
Condensate is contained Check the piping
Hunting never stops
The
PN-COSR-16
is
inappropriate for the
service conditions
(specifications)
Check the model
selection, replace the
PN-
COSR-16
if necessary
Hunting or
chattering
occurs
Chattering never
stops
The
PN-COSR-16
is
inappropriate for the
service conditions
(specifications)
Check the model
selection, replace the
PN-
COSR-16
if necessary
Abnormal noises Makes a high-
pitched noise
There is too high a
reduction ratio, the flow is
too great, or there is a
high-speed open/close
valve nearby Use two-stage reduction
Check the flow rate, use
a larger size
Install the valve as far
away as possible