Shut-off (or shutdown)
valve actuation systems range from manual activated to fully
automatic RPM sensed methods.
Envacon standard options include:
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- Manual via a "throttle type" pull
cable: Operator must realize the over-speed and manually
pull the 'T' handle of the cable assembly to actuate the
AIR STOP valve.
- Manual pneumatic: Operator must
realize the over-speed and manually actuate a 3-way
valve to actuate the AIR STOP valve.
- Manual electric: Operator must
realize the over-speed and manually actuate a switch to
energize the solenoid actuator on the AIR STOP
valve.
- Manual electric over pneumatic:
Operator must realize the over-speed and manually
actuate a switch to energize the solenoid valve, which
in turn allows pneumatic pressure to actuate the AIR
STOP valve.
- Automatic electric over pneumatic
system: Similar to the manual electric over pneumatic
above, the system also includes an over-speed module in
parallel to the manual circuit. The module reads an
electronic signal that is related to engine RPM (a
magnetic pick-up is commonly used to read the passing
flywheel teeth), and if a preset maximum RPM is
exceeded, the system/module will automatically actuate
the shut-off to shutdown the engine.
- Automatic electronic electric
system: Similar to the manual electric above, the system
also includes an over-speed module in parallel to the
manual circuit. The module reads an electronic signal
that is related to engine RPM (a magnetic pick-up is
commonly used to read the passing flywheel teeth), and
if a preset maximum RPM is exceeded, the system/module
will automatically actuate the shut-off to shutdown the
engine.
- ENVACON customer specific
systems. ENVACON can design customer specific actuation
systems. In addition to the above systems, ENVACON has
also supplied hydraulic actuated, loss of pressure to
close, and low pressure actuation systems.
- For the highest level of safety,
ENVACON recommends a fully automatic system be used.
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