TLV COSPECT M-COS-16, Инструкция по эксплуатации

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172-65188M-08 (
M-COS 3,16,21
Pressure Reducing Valve) 24 Jun 2015
33
Troubleshooting Chart
Problem Symptom Cause Remedy
The secondary
pressure does not
rise The
M-COS
body is
not warm
No steam is being
supplied or the inlet
valve is closed Check the valves
and piping
The body is warm,
but the pressure
does not increase The entrance to the
screens or strainer is
clogged Clean or blow down
The secondary
pressure cannot be
adjusted or increases
abnormally Motor is not turning
over Controller is
malfunctioning Check, repair
Adjustment is
difficult, and set
pressure varies The pilot screen is
clogged Clean
There is insufficient
steam flow Check the flow,
replace the
M-COS
if
necessary
The piston is
clogged with dirt Clean
Check the piston ring
The piston ring is
worn Replace with a new
piston ring
The small hole on 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
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
M-COS
if
necessary
The selected model
is inappropriate for
the service conditions
(specifications) Check the model
selection, replace the
M-COS
if necessary
Upon closing the
valves on 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
valve if necessary
There is a build-up of
dirt on or damage to
the pilot valve seat or
main valve seat Clean
Align
Replace if necessary
Hunting or chattering
occurs Occurs at low steam
demand It is being operated
below the lower flow
rate limit Check the volume of
steam supply,
replace with a smaller
diameter valve
Hunting never stops There is too high a
reduction ratio
(operated at below
10% of the primary
pressure) Use a two-stage
reduction
arrangement
The selected model
is inappropriate for
the service conditions
(specifications) Check the model
selection, replace the
M-COS
if necessary
Troubleshooting continued on next page