12 TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE
CORRECTIVE ACTION
The disc does not move
(no lift)
Test gag still in place
Remove the test gag
Foreign material trapped in
between a moving part and fixed
one.
Carry out maintenance to remove the part and to
overhaul the potential damaged parts.
The disc does not go to
the full rated lift
Upper adjusting ring too high.
Adjust the position of the ring.
Overlap ring too low.
Adjust the position of the ring.
Simmer
Lower adjusting ring too low.
Adjust the position of the ring.
Steam line / equipment vibrations Investigate the source of the vibration and
strengthen the support.
e
h
t
e
g
n
a
h
c
o
t
r
o
p
a
l
o
t
e
c
n
a
n
e
t
n
i
a
m
t
u
o
y
r
r
a
C
t
a
e
s
d
e
g
a
m
a
D
e
g
a
k
a
e
l
t
a
e
S
disc and to lap or to machine the nozzle.
Part misalignment
Inspect the contact surfaces of each component
from the set screw to the disc. Check also the
spindle alignment and concentricity.
Disc hinge is not has insufficient
articulation
Inspect the disc and spindle hinge surface.
Incorrect discharge piping support
allowances or its weight supported
by the valve outlet flange.
A Rearrange the support hardware. Install if drip
pan if necessary. Review the outlet piping
installation.
The disc does not
reseat
Lower adjusting ring too high.
Adjust the position of the ring.
Foreign material
Carry out maintenance to remove the
component and overhaul any damaged parts.
Long blowdown
Upper adjusting ring too low.
Adjust the position of the ring.
Built-up back pressure too high.
Identify the source of the high back pressure.
Decide by a process of elimination the source
and extent of the problem – reassess, review
and reconstruct the outlet piping accordingly.
Overlap ring too high.
Adjust the position of the ring.
Chatter or short
blowdown
Upper adjusting ring far too high.
Adjust the position of the ring.
Overlap ring far too high.
Adjust the position of the ring.
Upstream pressure drop too high. Redesign the inlet piping to reduce the pressure
drop to less than the ½ blowdown value
40
|
www.trilliumflow.com
STARFLOW V
™
PRESSURE RELIEF VALVE
SARASIN-RSBD
™
