Electric Actuator
An electro-mechanical device used to open and close or
modulate a valve. The actuator (which is mounted and coupled
to the valve in similar fashion as the pneumatic actuator),
operates the valve using an electric motor driving a gear
train. While the basic function of the electric actuator is
similar to the pneumatic, there are distinct differences in
the application and flexibility of the two types, and these
differences should be considered to select the proper type.
Electric Failsafe Actuator
Electrically driven actuator that contains an internal
spring to close the valve on loss of electricity.
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Actuator Accessory and Rating Terminology
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Nema Rating - National Electrical Code Ratings for
electrical component enclosures.
Most Commonly Applied to Actuation Products
Nema 4 - Weather-proof enclosure suitable for
indoor/outdoor applications to protect from windblown dust,
rain or hose-directed water.
Nema 4x - Offers the same protection as Nema 4
with the addition of corrosion resistance.
Nema 6 - Enclosure that may be submerged up to six
feet for 30 minutes.
Nema 7 - Enclosure for hazardous locations, must
be capable of withstanding an internal explosion of gases so
as not to ignite an external gas-air mixture.
*NOTE - National Electrical Code should be referenced
for in depth detail of ratings and test procedure.
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