7 Troubleshooting
7.1 Troubleshooting
Symptom
Cause
Remedy
Bonnet will not install onto studs
Compressor ring extension. Rotating
of the bonnet cover while the Envi-
Zion top works is not mounted to the
body may result in the compression
ring becoming extended and prevent-
ing proper bonnet installation.
Rotate the bonnet cover in the coun-
ter clockwise direction and manually
press the compressor ring flush with
the topworks bonnet flange.
Slight actuator movement during
stroke
The movement is as a result of the
design feature that allows the actua-
tor to be rotated 360 degrees.
None required. The valve/diaphragm
sealing is not affected by this move-
ment during the stroke of the valve
and is not indicative of a problem.
Bonnet will not install onto studs (Fail
closed actuated)
No instrument air supplied to actuator Due to the unique attachment method
of the EnviZion, air must be applied to
Fail Close actuators to retract the
compressor assembly and diaphragm
to the neutral position to properly
mount the actuator. ITT recommends
a 3 way ball valve connection on the
air inlet to allow for local air control
during bonnet installation.
Handwheel/Cover binding during bon-
net installation
During bonnet installation the manual
hand wheel may turn along with the
bonnet cover.
For proper installation ensure that the
hand wheel is in the open position
and not binding with the bonnet cov-
er. Open the hand wheel further if
binding occurs.
Shell leakage in prolonged service
Diaphragm has reached its useful
service life or the valve body is dam-
aged in the sealing area.
•
EnviZion: The bonnet pin is de-
signed to lock in place when
the proper installation position
is achieved. This position as-
sures proper shell performance
for the life of the diaphragm in
service. This feature can be
over ridden and additional force
applied in the event that an ex-
ternal seal leak were to occur.
Place the bonnet lock pin in the
extended position and rotate
the bonnet cover slightly clock-
wise. Rotate the locking pin
again allowing it to drop in the
next ratchet position. This is on-
ly a temporary solution, mainte-
nance should be alerted to the
leakage issue.
•
BioviZion: Temporary extension
of diaphragm life by loosening
cover screw, tightening cover a
partial turn, and re-tighten cov-
er screw to lock in place.
Bonnet Cover Bound (EnviZion)
The EnviZion bonnet cover has inter-
nal stops that are designed to prevent
the cover from being rotated too far in
Lift the cover away from the bonnet
while applying generous clockwise
force. This will overcome the internal
7 Troubleshooting
EnviZion and BioviZion Valves Installation, Operation, and Maintenance Manual
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